During restorative dental procedures,complete control over the operative site is critical for patient comfort,safety,and the operator’s access and visibility.The success of a fixed prosthesis depends on accurate impr...During restorative dental procedures,complete control over the operative site is critical for patient comfort,safety,and the operator’s access and visibility.The success of a fixed prosthesis depends on accurate impression making of the prepared finish lines on the abutment teeth.To optimise long-term outcomes for the fixed restoration,gingival retraction techniques should be used to decrease the marginal discrepancy among the restoration and the prepared abutment.Accurate marginal positioning of the restoration along the prepared finish line of the abutment is essential for therapeutic,preventive,and aesthetic purposes.展开更多
The application of digital technology in prosthodontics not only improves the accuracy of restoration and the efficiency of diagnosis and treatment,but also brings more comfortable and convenient diagnosis and treatme...The application of digital technology in prosthodontics not only improves the accuracy of restoration and the efficiency of diagnosis and treatment,but also brings more comfortable and convenient diagnosis and treatment experience to patients.It effectively promotes the rapid development of the prosthodontic aesthetics industry and leads prosthodontic technology to gradually enter a new digital era.Combining the advantages of digital technology in prosthodontics,this paper focuses on the specific applications of digital impression technology,CAD/CAM technology,network-based integrated cloud service technology,and CBCT technology in prosthodontics.On this basis,it prospects the development trend of digital technology in the field of prosthodontics,aiming to provide solid theoretical and practical support for clinical practice of prosthodontics and promote the gradual integration of the prosthodontic industry with the digital era.展开更多
The concepts and progress of evidence-based dentistry were introduced in this critical review. An extensive PubMed search was conducted to provide sound evidences for some frequently encountered problems in prosthodon...The concepts and progress of evidence-based dentistry were introduced in this critical review. An extensive PubMed search was conducted to provide sound evidences for some frequently encountered problems in prosthodontic daily practice. Conlusively, it is important for prosthodontists to keep current by looking for efficient ways of interpreting high quality evidences to clinical practice.展开更多
Prosthodontics,deals in the restoration and replacement of missing and structurally compromised teeth,this field has been remarkably transformed in the last two decades.Through the integration of digital imaging and t...Prosthodontics,deals in the restoration and replacement of missing and structurally compromised teeth,this field has been remarkably transformed in the last two decades.Through the integration of digital imaging and threedimensional printing,prosthodontics has evolved to provide more durable,precise,and patient-centric outcome.However,as we stand at the convergence of technology and healthcare,a new era is emerging,one that holds immense promise for the field and that is artificial intelligence(AI).In this paper,we explored the fascinating challenges and prospects associated with the future of prosthodontics in the era of AI.展开更多
<b><span style="font-family:Verdana;">Background:</span></b><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">During ...<b><span style="font-family:Verdana;">Background:</span></b><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">During several years, ascorbic acid (vitamin C) played a significant role in the health of periodontal tissues.</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">The goals of prosthodontics management are to restore the missing teeth, provide the loss of teeth functions, and establish acceptable dental esthetics, and there are some evidence</span><span style="font-family:Verdana;">s </span><span style="font-family:Verdana;">reveal</span><span style="font-family:Verdana;">ing</span><span style="font-family:Verdana;"> the passive effects of snuff</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">on the results of prosthodontics and periodontal treatment</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> so the present study </span><span style="font-family:Verdana;">is </span><span style="font-family:Verdana;">performed to evaluate the outcomes of topical application of ascorbic acid solution as an adjunctive method of periodontal therapy among wet sniff users after prosthodontics therapy.</span><span style="font-family:Verdana;"> </span><b><span style="font-family:Verdana;">Methods:</span></b><b><span style="font-family:Verdana;"> </span></b><span style="font-family:Verdana;">The clinical situation was evaluated in 150 moderate periodontitis patients after conventional periodontal and prosthodontics therapy. They were selected from outpatient clinics, college of dentistry, King Khalid University, and from some hospitals Ministry of Health in Tabuk, Jazan and Aseer regions. The study was conducted from September 2020 to December 2020. The time of post-treatment assessment was one year. The study was included 50 patients </span><span style="font-family:Verdana;">who </span><span style="font-family:Verdana;">don</span><span style="font-family:Verdana;">’</span><span style="font-family:Verdana;">t use wet snuff as a group I (GI) (control group), 50 patients wet snuff users as group II (GII), and 50 patients wet snuff users were treated with topical application of ascorbic acid solution as group III (GIII). The participants were aged over 20 years, with a mean age of 35 years. The duration of using wet snuff was at least one year. Plaque index (PLI), gingival index (GI), clinical attachment loss (CAL) were recorded at baseline (first visit), then after 4</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">weeks</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">(second visit) and after 6</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">weeks</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">(third visit) of conventional periodontal therapy and topical application of ascorbic acid solution. Statistical analysis was done using ANOVA test and paired t-test. </span><b><span style="font-family:Verdana;">Results: </span></b><span style="font-family:Verdana;">According to statistical analysis, there was the inclination of decrease in the mean and </span><span style="font-family:Verdana;">standard deviation of plaque index (PLI) from 2.8</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">1.4 to 2.5</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.51, and 2.</span><span style="font-family:Verdana;">7</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.33 in group II, and decrease from 2.7</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.34 to 2.5</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.23 and 2.6</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.65 in group III. Similarly in the gingival index (GI)</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> there was a decrease in the mean and standard deviation from 2.8</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.52 to 2.3</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.62 and 2.5</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.51 in group II and a decrease from 2.5</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.8 to 2.3</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.58 and 2.4</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.47 in group III. Moreover, there was a decrease in the mean and standard deviation of clinical attachment loss (CAL) from 4.5</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.26 to 3.9</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.83 and 4.2</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.83 in group II and from 4.2</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.31 to 3.8</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.46 and 3.8</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.31 in group III;less than group I without significance differences (p > 0. 05) in all study groups at baseline and after 4</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">weeks, and 6</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">weeks of follow up except CAL. </span><b><span style="font-family:Verdana;">Conclusion:</span></b><span style="font-family:Verdana;"> The results of our study displayed that periodontal parameters vary among wet snuff users after topical application of ascorbic acid solution as an adjunctive method of periodontal therapy</span>展开更多
Prosthodontics is one of the main courses of oral clinical oral compulsory medical students, and it is a highly practical skill required for the course. In the teaching process, we not only should pay attention to the...Prosthodontics is one of the main courses of oral clinical oral compulsory medical students, and it is a highly practical skill required for the course. In the teaching process, we not only should pay attention to the teaching of theoretical knowledge, but should strengthen the training of practical skills. In order to improve the teaching quality of experimental teaching and students＇ practical ability, we reform the method of experimental evaluation in prosthodontics experimental teaching, explore the establishment of a reasonable, applicable and effective experiment prosthodontics assessment methods.展开更多
Objective: to study the effect of four-handed surgery on improving the therapeutic effect in the repair and nursing cooperation. Methods: 86 patients who received oral repair in our hospital from April 2018 to October...Objective: to study the effect of four-handed surgery on improving the therapeutic effect in the repair and nursing cooperation. Methods: 86 patients who received oral repair in our hospital from April 2018 to October 2019 were randomly divided into two groups (control group and observation group) with 43 cases in each group. The operation time, incidence of side effects and satisfaction were observed. Results: the operation time of the observation group was 21.33±4.81 min, and the satisfaction score (89.37±2.61) was lower than that of the control group (P < 0.05). The incidence of adverse reactions in the observation group (4.65%) was lower than that in the control group (20.93%), P < 0.05. Conclusion: the application of four-hand operation in the nursing cooperation of stomatology department can reduce the operation time, reduce the incidence of adverse reactions and improve patient satisfaction, which is worthy of reference.展开更多
A flexible and adaptable design method for the tooth crown is presented based on the direct manipulation of free-form deformation （FFD）. The correct shape of the tooth crown can be obtained by adding, modifying, and...A flexible and adaptable design method for the tooth crown is presented based on the direct manipulation of free-form deformation （FFD）. The correct shape of the tooth crown can be obtained by adding, modifying, and deleting constraint points or load points based on stretching and compressing operation. Finally, an example is given to illustrate the method to be efficient.展开更多
Zirconia-based bioceramics have been widely applied in the field of prosthodontics owing to its desir- able mechanical performance, biocompatibility and aesthetics. However, the low-temperature degradation （LTD） of ...Zirconia-based bioceramics have been widely applied in the field of prosthodontics owing to its desir- able mechanical performance, biocompatibility and aesthetics. However, the low-temperature degradation （LTD） of tetragonal zirconia （ZrOJ under intraoral condition can lead to the deterioration of mechanical properties of ZrO2 dental crowns, which contribute to many clinical failures in long-term observations. The long-term tetragonal phase stability and mechanical properties of yttria-stabilized tetragonal zir- conia polycrystal （Y-TZP） are influenced by grain size of ZrO2 crystals, distribution and properties of stabilizers, the humid environment, etc. However, it is still difficult to control the abovementioned factors at the same time. This review summarizes the major advances in researches dealing with LTD and clari- fies the obstacles to stabilization of the tetragonal ZrO2. Furthermore, the suggestions on improving the LTD resistance of tetragonal ZrO2 are proposed, which is the catalyst to promote the long-term stability of ZrO2-based all-ceramic crowns.展开更多
Purpose: To evaluate tooth preparation for full veneer cast restorations performed by final year dental students in Sudan. Materials and Methods: 117 stone dies from two different dental institutions were collected an...Purpose: To evaluate tooth preparation for full veneer cast restorations performed by final year dental students in Sudan. Materials and Methods: 117 stone dies from two different dental institutions were collected and evaluated. Polyvinylsilioxane impression material was used to produce two impressive replicas of which one was sectioned in faciolingual plane and the other in mesiodistal plane. Occlusal clearance was measured using a digital caliper. Amount of axial preparation was also measured. Impression silhouettes that were produced using an overhead projector were used to measure convergence angle. Working casts were examined for smoothness and evenness of the preparations, existence or absence of additional features of retention and the finishing line were evaluated for its position and continuity. All obtained data were statistically analyzed by using T-test, ANO-VA, and Pearson Chi square tests. P-values ≤ 0.05 were considered as statistically significant. Results: Average taper of the examined preparations was 39.98?, with 44.1? in the faciolingual, and 35.8? in the mesiodistal dimensions. Preparations for full coverage restorations were over prepared. 38.5% of the total number of preparations were found to have finishing lines in the sub and supra gingival positions. 19.66% were unable to maintain continuity of the finishing line all around the preparation. All preparations were generally smooth with no sharp angles, and 1.7% of the preparations had additional retentive features. Conclusion: Within the limitations of this study, it could be concluded that the convergence angle and finishing line preparations were less than adequate in a sizeable proportion of the preparations examined.展开更多
In dentistry, speech evaluation is important for appropriate orofacial dysfunction rehabilitation. The speech intelligibility test is often used to assess patients’ speech, and it involves an evaluation by human list...In dentistry, speech evaluation is important for appropriate orofacial dysfunction rehabilitation. The speech intelligibility test is often used to assess patients’ speech, and it involves an evaluation by human listeners. However, the test has certain shortcomings, and an alternative method, without a listening procedure, is needed. The purpose of this study was to test the applicability of an automatic speech intelligibility test system using a computerized speech recognition technique. Speech of 10 normal subjects, when wearing a dental appliance, was evaluated using an automatic speech intelligibility test system that was developed using computerized speech recognition software. The results of the automatic test were referred to as the speech recognition scores. The Wilcoxon signed rank test was used to analyze differences in the results of the test between the following 2 conditions: with the palatal plate in place and with the palatal plate removed. Spearman correlation coefficients were used to evaluate whether the speech recognition score correlated with the result of conventional intelligibility test. The speech recognition score was significantly decreased when wearing the plate (z = -2.807, P = 0.0050). The automatic evaluation results positively correlated with that of conventional evaluation when wearing the appliance (r = 0.729, P = 0.017). The automatic speech testing system may be useful for evaluating speech intelligibility in denture wearers.展开更多
BACKGROUND Generalized periodontitis is a severe periodontal disease characterized by rapid periodontal destruction in healthy persons.This case report describes the treatment of a severe crowding,large overjet,and oc...BACKGROUND Generalized periodontitis is a severe periodontal disease characterized by rapid periodontal destruction in healthy persons.This case report describes the treatment of a severe crowding,large overjet,and occlusal collapse due to the loss of anterior guidance with generalized periodontitis.CASE SUMMARY A 35-year-old female patient with a chief complaint of crowding and maxillary protrusion was diagnosed with generalized periodontitis by clinical and radiographic examinations.To improve crowding and overjet,orthodontic treatment was performed after basic periodontal therapy.Severely damaged upper right lateral incisor and left canine were extracted,and lower right first premolar and left second premolar were also removed to treat severe crowding.After orthodontic treatment,periodontal flap surgery for upper left molars and guided tissue regeneration for the lower left second molar was performed.Then,a dental implant was inserted in the upper left canine legion.The esthetics of the maxillary anterior tooth was improved by prosthetic restorations.The treatment result showed a well-improved occlusion with proper anterior guidance and healthy periodontal tissue after a retention period of 10 years.CONCLUSION Periodontal,orthodontic,and prosthodontic treatments are extremely useful to improve function and stable periodontal tissue for generalized periodontitis.展开更多
BACKGROUND Palato-radicular groove(PRG)is defined as an anomalous formation of teeth.The etiology of PRG remains unclear.The prognosis of a tooth with a PRG is unfavorable.The treatment of combined periodontal-endodon...BACKGROUND Palato-radicular groove(PRG)is defined as an anomalous formation of teeth.The etiology of PRG remains unclear.The prognosis of a tooth with a PRG is unfavorable.The treatment of combined periodontal-endodontic lesions requires multidisciplinary management to control the progression of bone defects.Some researchers reported cases that had short-term observations.The management of teeth with PRGs is of great clinical significance.However,to date,no case reports have been documented on the use of bone regeneration and prosthodontic treatment for PRGs.CASE SUMMARY This case reported the management of a 40-year-old male patient with the chief complaint of slight mobility and abscess in the upper right anterior tooth for 15 d and was diagnosed with type II PRG of tooth 12 with combined endodonticperiodontal lesions.The accumulation of plaque and calculus caused primary periodontitis and a secondary endodontic infection.A multidisciplinary management approach was designed that included root canal therapy,groove sealing,a periodontal regenerative procedure,and prosthodontic treatment.During a 2-year follow-up period,a good prognosis was observed.CONCLUSION This report indicates that bone regeneration and prosthodontic treatment may contribute to the long-term favorable prognosis of teeth with PRGs.展开更多
Background: The mental, physical and social impediments cause limitation of chances in normal life as an equal level with others of the community;particularly in relation to maintain good oral hygiene and periodontal ...Background: The mental, physical and social impediments cause limitation of chances in normal life as an equal level with others of the community;particularly in relation to maintain good oral hygiene and periodontal health among the disabled patients who were receiving fixed partial denture. So the present study was performed to evaluate the periodontal tissue status among mental retardation patients with fixed prosthodontic appliances. Subjects and Methods: A total of 400 patients between the ages 18 and 50 years were clinically selected from outpatient clinics, college of dentistry, King Khalid University and rehabilitation center in Abha city, Saudi Arabia. They were divided into two equal groups as the following: group I: Two hundred mental retardation patients without fixed prosthodontic appliances (control group) and, group II: Two hundred mental retardation patients had fixed prosthodontic appliances for at least a year ago. A complete periodontal clinical examination was performed and the following indices were recorded: plaque index (PLI), gingival index (GI), and clinical attachment loss (CAL). All data was recorded and analyzed by ANOVA test. Results: The clinical results of the present study confirmed the relationship among the mental retardation, fixed prosthodontic appliances and destruction of periodontal tissues. It has been found that the severity of periodontal disease increases among the study group compared to the control group. Statistically significant differences were found in PLI, GI and CAL in the comparison between group I and II (p Conclusion: There was a negative relationship between mental retardation with a status of periodontal tissues and oral hygiene among the patients under fixed prosthodontic management.展开更多
<b><span style="font-family:Verdana;">Introduction:</span></b><span style="font-family:Verdana;"> I Do Biotech’s implants were developed starting in 2014. Since then,...<b><span style="font-family:Verdana;">Introduction:</span></b><span style="font-family:Verdana;"> I Do Biotech’s implants were developed starting in 2014. Since then, they obtained GMP and KFDA licenses for distribution in 2015. The main objective of this paper is to determine the survival rate of I Do Biotech implants five years after the first surgery.</span><span style="font-family:Verdana;"> </span><b><span style="font-family:Verdana;">Material and Methods:</span></b><span style="font-family:Verdana;"> 1000 implants were used on 480 prosthes</span><span style="font-family:Verdana;">e</span><span style="font-family:Verdana;">s across 10 clinics on 320 healthy, non-smoker and non-diabetic patients, chosen at random, of which 160 are male and 160 female, all in the age range of 30 to 50 years old. The failure rate was studied related to the patient’s gender, the length and diameter of the implant, anatomical location, the percentage of peri-implantitis, prosthodontic failures and the patient’s quality of life.</span><span style="font-family:Verdana;"> </span><b><span style="font-family:Verdana;">Discussion:</span></b><span style="font-family:Verdana;"> The results obtained are similar to those of Van Steenberghe D. Dieter-Busenlechner, E. Serrano Catauria and far superior to those of Sáenz Guzmán. Failure rates vary greatly from study to study due to the heterogeneity of the samples in the other research papers. </span><b><span style="font-family:Verdana;">Conclusion:</span></b><span style="font-family:Verdana;"> The overall implant failure rate at 5 years is 1.7%. The factors affecting significantly the survival rate are: the implant diameter, its length and the anatomic area. Failure ratios increase significantly when the diameter or the length of the implant decrease</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;">, and when they are placed in the posterior maxilla (up to 4.3%).</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">The rate of peri-implantitis is 5.1%. The prosthodontic failure rate is 2.91%. The improvement in quality of life and satisfaction increases with the years.</span>展开更多
Epilepsy has direct negative effects on sufferers’ general dental condition and oral health, both of which are further affected by inadequate oral hygiene;poor oral hygiene itself is often also caused by epilepsy-rel...Epilepsy has direct negative effects on sufferers’ general dental condition and oral health, both of which are further affected by inadequate oral hygiene;poor oral hygiene itself is often also caused by epilepsy-related poor health. Consequently, tooth loss, caries and periodontal disease occur increasingly often in epilepsy sufferers and they need more dental treatment. However, in fact the epileptic patients can receive fewer and simpler treatment modalities. The aim of this study was to review and synthesize recent studies on dental treatment in epilepsy patients and to mention potential triggers for seizures in dental practice.展开更多
Designing a functional occlusal surface for denture crowns is a complex and important task in prosthodontics.Manual design is time-consuming and heavily relies on the dentist's experience,as it requires careful co...Designing a functional occlusal surface for denture crowns is a complex and important task in prosthodontics.Manual design is time-consuming and heavily relies on the dentist's experience,as it requires careful consideration of occlusal function.Due to the limitations of manual design,the field has turned to data-driven methods for occlusal surface design.However,many of these methods neglect critical geometric details,such as normals and curvature,impacting the quality of the occlusal surface.In this paper,we introduce Diff-OSGN,a novel denture crown occlusal surface generation network based on a denoising diffusion model,which focuses on generating the detailed geometric structure of denture crowns.We model the occlusal surface as a geometry map based on the occlusal plane,incorporating height and normal maps rasterized from intra-oral crown scanning.Both maps represent occlusal surface geometry,and their combination further enhances these details.Considering the crucial occlusal information,we extract features from the geometry maps of adjacent and occlusal teeth,using them as conditions in the reverse diffusion process to train our network for optimal occlusal function.Additionally,we define three geometric operators and corresponding loss functions as constraints to better extract geometric features of the target occlusal surface,such as ridges and grooves,for adequate supervision.Our results demonstrate that Diff-OSGN provides quantitatively and qualitatively superior performance than competing baselines and state-of-the-art methods.展开更多
文摘During restorative dental procedures,complete control over the operative site is critical for patient comfort,safety,and the operator’s access and visibility.The success of a fixed prosthesis depends on accurate impression making of the prepared finish lines on the abutment teeth.To optimise long-term outcomes for the fixed restoration,gingival retraction techniques should be used to decrease the marginal discrepancy among the restoration and the prepared abutment.Accurate marginal positioning of the restoration along the prepared finish line of the abutment is essential for therapeutic,preventive,and aesthetic purposes.
基金Wuhan University of Arts and Science 2023 University-Level Scientific Research(Project No.:2023xk33)。
文摘The application of digital technology in prosthodontics not only improves the accuracy of restoration and the efficiency of diagnosis and treatment,but also brings more comfortable and convenient diagnosis and treatment experience to patients.It effectively promotes the rapid development of the prosthodontic aesthetics industry and leads prosthodontic technology to gradually enter a new digital era.Combining the advantages of digital technology in prosthodontics,this paper focuses on the specific applications of digital impression technology,CAD/CAM technology,network-based integrated cloud service technology,and CBCT technology in prosthodontics.On this basis,it prospects the development trend of digital technology in the field of prosthodontics,aiming to provide solid theoretical and practical support for clinical practice of prosthodontics and promote the gradual integration of the prosthodontic industry with the digital era.
文摘The concepts and progress of evidence-based dentistry were introduced in this critical review. An extensive PubMed search was conducted to provide sound evidences for some frequently encountered problems in prosthodontic daily practice. Conlusively, it is important for prosthodontists to keep current by looking for efficient ways of interpreting high quality evidences to clinical practice.
文摘Prosthodontics,deals in the restoration and replacement of missing and structurally compromised teeth,this field has been remarkably transformed in the last two decades.Through the integration of digital imaging and threedimensional printing,prosthodontics has evolved to provide more durable,precise,and patient-centric outcome.However,as we stand at the convergence of technology and healthcare,a new era is emerging,one that holds immense promise for the field and that is artificial intelligence(AI).In this paper,we explored the fascinating challenges and prospects associated with the future of prosthodontics in the era of AI.
文摘<b><span style="font-family:Verdana;">Background:</span></b><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">During several years, ascorbic acid (vitamin C) played a significant role in the health of periodontal tissues.</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">The goals of prosthodontics management are to restore the missing teeth, provide the loss of teeth functions, and establish acceptable dental esthetics, and there are some evidence</span><span style="font-family:Verdana;">s </span><span style="font-family:Verdana;">reveal</span><span style="font-family:Verdana;">ing</span><span style="font-family:Verdana;"> the passive effects of snuff</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">on the results of prosthodontics and periodontal treatment</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> so the present study </span><span style="font-family:Verdana;">is </span><span style="font-family:Verdana;">performed to evaluate the outcomes of topical application of ascorbic acid solution as an adjunctive method of periodontal therapy among wet sniff users after prosthodontics therapy.</span><span style="font-family:Verdana;"> </span><b><span style="font-family:Verdana;">Methods:</span></b><b><span style="font-family:Verdana;"> </span></b><span style="font-family:Verdana;">The clinical situation was evaluated in 150 moderate periodontitis patients after conventional periodontal and prosthodontics therapy. They were selected from outpatient clinics, college of dentistry, King Khalid University, and from some hospitals Ministry of Health in Tabuk, Jazan and Aseer regions. The study was conducted from September 2020 to December 2020. The time of post-treatment assessment was one year. The study was included 50 patients </span><span style="font-family:Verdana;">who </span><span style="font-family:Verdana;">don</span><span style="font-family:Verdana;">’</span><span style="font-family:Verdana;">t use wet snuff as a group I (GI) (control group), 50 patients wet snuff users as group II (GII), and 50 patients wet snuff users were treated with topical application of ascorbic acid solution as group III (GIII). The participants were aged over 20 years, with a mean age of 35 years. The duration of using wet snuff was at least one year. Plaque index (PLI), gingival index (GI), clinical attachment loss (CAL) were recorded at baseline (first visit), then after 4</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">weeks</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">(second visit) and after 6</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">weeks</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">(third visit) of conventional periodontal therapy and topical application of ascorbic acid solution. Statistical analysis was done using ANOVA test and paired t-test. </span><b><span style="font-family:Verdana;">Results: </span></b><span style="font-family:Verdana;">According to statistical analysis, there was the inclination of decrease in the mean and </span><span style="font-family:Verdana;">standard deviation of plaque index (PLI) from 2.8</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">1.4 to 2.5</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.51, and 2.</span><span style="font-family:Verdana;">7</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.33 in group II, and decrease from 2.7</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.34 to 2.5</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.23 and 2.6</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.65 in group III. Similarly in the gingival index (GI)</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> there was a decrease in the mean and standard deviation from 2.8</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.52 to 2.3</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.62 and 2.5</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.51 in group II and a decrease from 2.5</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.8 to 2.3</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.58 and 2.4</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.47 in group III. Moreover, there was a decrease in the mean and standard deviation of clinical attachment loss (CAL) from 4.5</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.26 to 3.9</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.83 and 4.2</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.83 in group II and from 4.2</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.31 to 3.8</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.46 and 3.8</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">±</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">0.31 in group III;less than group I without significance differences (p > 0. 05) in all study groups at baseline and after 4</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">weeks, and 6</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">weeks of follow up except CAL. </span><b><span style="font-family:Verdana;">Conclusion:</span></b><span style="font-family:Verdana;"> The results of our study displayed that periodontal parameters vary among wet snuff users after topical application of ascorbic acid solution as an adjunctive method of periodontal therapy</span>
文摘Prosthodontics is one of the main courses of oral clinical oral compulsory medical students, and it is a highly practical skill required for the course. In the teaching process, we not only should pay attention to the teaching of theoretical knowledge, but should strengthen the training of practical skills. In order to improve the teaching quality of experimental teaching and students＇ practical ability, we reform the method of experimental evaluation in prosthodontics experimental teaching, explore the establishment of a reasonable, applicable and effective experiment prosthodontics assessment methods.
文摘Objective: to study the effect of four-handed surgery on improving the therapeutic effect in the repair and nursing cooperation. Methods: 86 patients who received oral repair in our hospital from April 2018 to October 2019 were randomly divided into two groups (control group and observation group) with 43 cases in each group. The operation time, incidence of side effects and satisfaction were observed. Results: the operation time of the observation group was 21.33±4.81 min, and the satisfaction score (89.37±2.61) was lower than that of the control group (P < 0.05). The incidence of adverse reactions in the observation group (4.65%) was lower than that in the control group (20.93%), P < 0.05. Conclusion: the application of four-hand operation in the nursing cooperation of stomatology department can reduce the operation time, reduce the incidence of adverse reactions and improve patient satisfaction, which is worthy of reference.
文摘A flexible and adaptable design method for the tooth crown is presented based on the direct manipulation of free-form deformation （FFD）. The correct shape of the tooth crown can be obtained by adding, modifying, and deleting constraint points or load points based on stretching and compressing operation. Finally, an example is given to illustrate the method to be efficient.
基金?nancially supported by the National Natural Science Foundation of China(No.81500897)China Scholarship Council(No.201408210385)+1 种基金Foundation of the Education Department of Liaoning Province in China(No.L2013285)Science and Technology Planning Project of Shenyang City(No.F11-262-9-16)
文摘Zirconia-based bioceramics have been widely applied in the field of prosthodontics owing to its desir- able mechanical performance, biocompatibility and aesthetics. However, the low-temperature degradation （LTD） of tetragonal zirconia （ZrOJ under intraoral condition can lead to the deterioration of mechanical properties of ZrO2 dental crowns, which contribute to many clinical failures in long-term observations. The long-term tetragonal phase stability and mechanical properties of yttria-stabilized tetragonal zir- conia polycrystal （Y-TZP） are influenced by grain size of ZrO2 crystals, distribution and properties of stabilizers, the humid environment, etc. However, it is still difficult to control the abovementioned factors at the same time. This review summarizes the major advances in researches dealing with LTD and clari- fies the obstacles to stabilization of the tetragonal ZrO2. Furthermore, the suggestions on improving the LTD resistance of tetragonal ZrO2 are proposed, which is the catalyst to promote the long-term stability of ZrO2-based all-ceramic crowns.
文摘Purpose: To evaluate tooth preparation for full veneer cast restorations performed by final year dental students in Sudan. Materials and Methods: 117 stone dies from two different dental institutions were collected and evaluated. Polyvinylsilioxane impression material was used to produce two impressive replicas of which one was sectioned in faciolingual plane and the other in mesiodistal plane. Occlusal clearance was measured using a digital caliper. Amount of axial preparation was also measured. Impression silhouettes that were produced using an overhead projector were used to measure convergence angle. Working casts were examined for smoothness and evenness of the preparations, existence or absence of additional features of retention and the finishing line were evaluated for its position and continuity. All obtained data were statistically analyzed by using T-test, ANO-VA, and Pearson Chi square tests. P-values ≤ 0.05 were considered as statistically significant. Results: Average taper of the examined preparations was 39.98?, with 44.1? in the faciolingual, and 35.8? in the mesiodistal dimensions. Preparations for full coverage restorations were over prepared. 38.5% of the total number of preparations were found to have finishing lines in the sub and supra gingival positions. 19.66% were unable to maintain continuity of the finishing line all around the preparation. All preparations were generally smooth with no sharp angles, and 1.7% of the preparations had additional retentive features. Conclusion: Within the limitations of this study, it could be concluded that the convergence angle and finishing line preparations were less than adequate in a sizeable proportion of the preparations examined.
文摘In dentistry, speech evaluation is important for appropriate orofacial dysfunction rehabilitation. The speech intelligibility test is often used to assess patients’ speech, and it involves an evaluation by human listeners. However, the test has certain shortcomings, and an alternative method, without a listening procedure, is needed. The purpose of this study was to test the applicability of an automatic speech intelligibility test system using a computerized speech recognition technique. Speech of 10 normal subjects, when wearing a dental appliance, was evaluated using an automatic speech intelligibility test system that was developed using computerized speech recognition software. The results of the automatic test were referred to as the speech recognition scores. The Wilcoxon signed rank test was used to analyze differences in the results of the test between the following 2 conditions: with the palatal plate in place and with the palatal plate removed. Spearman correlation coefficients were used to evaluate whether the speech recognition score correlated with the result of conventional intelligibility test. The speech recognition score was significantly decreased when wearing the plate (z = -2.807, P = 0.0050). The automatic evaluation results positively correlated with that of conventional evaluation when wearing the appliance (r = 0.729, P = 0.017). The automatic speech testing system may be useful for evaluating speech intelligibility in denture wearers.
文摘BACKGROUND Generalized periodontitis is a severe periodontal disease characterized by rapid periodontal destruction in healthy persons.This case report describes the treatment of a severe crowding,large overjet,and occlusal collapse due to the loss of anterior guidance with generalized periodontitis.CASE SUMMARY A 35-year-old female patient with a chief complaint of crowding and maxillary protrusion was diagnosed with generalized periodontitis by clinical and radiographic examinations.To improve crowding and overjet,orthodontic treatment was performed after basic periodontal therapy.Severely damaged upper right lateral incisor and left canine were extracted,and lower right first premolar and left second premolar were also removed to treat severe crowding.After orthodontic treatment,periodontal flap surgery for upper left molars and guided tissue regeneration for the lower left second molar was performed.Then,a dental implant was inserted in the upper left canine legion.The esthetics of the maxillary anterior tooth was improved by prosthetic restorations.The treatment result showed a well-improved occlusion with proper anterior guidance and healthy periodontal tissue after a retention period of 10 years.CONCLUSION Periodontal,orthodontic,and prosthodontic treatments are extremely useful to improve function and stable periodontal tissue for generalized periodontitis.
基金Supported by the Young Innovative Talents of Zhejiang Province,No.2022RC158.
文摘BACKGROUND Palato-radicular groove(PRG)is defined as an anomalous formation of teeth.The etiology of PRG remains unclear.The prognosis of a tooth with a PRG is unfavorable.The treatment of combined periodontal-endodontic lesions requires multidisciplinary management to control the progression of bone defects.Some researchers reported cases that had short-term observations.The management of teeth with PRGs is of great clinical significance.However,to date,no case reports have been documented on the use of bone regeneration and prosthodontic treatment for PRGs.CASE SUMMARY This case reported the management of a 40-year-old male patient with the chief complaint of slight mobility and abscess in the upper right anterior tooth for 15 d and was diagnosed with type II PRG of tooth 12 with combined endodonticperiodontal lesions.The accumulation of plaque and calculus caused primary periodontitis and a secondary endodontic infection.A multidisciplinary management approach was designed that included root canal therapy,groove sealing,a periodontal regenerative procedure,and prosthodontic treatment.During a 2-year follow-up period,a good prognosis was observed.CONCLUSION This report indicates that bone regeneration and prosthodontic treatment may contribute to the long-term favorable prognosis of teeth with PRGs.
文摘Background: The mental, physical and social impediments cause limitation of chances in normal life as an equal level with others of the community;particularly in relation to maintain good oral hygiene and periodontal health among the disabled patients who were receiving fixed partial denture. So the present study was performed to evaluate the periodontal tissue status among mental retardation patients with fixed prosthodontic appliances. Subjects and Methods: A total of 400 patients between the ages 18 and 50 years were clinically selected from outpatient clinics, college of dentistry, King Khalid University and rehabilitation center in Abha city, Saudi Arabia. They were divided into two equal groups as the following: group I: Two hundred mental retardation patients without fixed prosthodontic appliances (control group) and, group II: Two hundred mental retardation patients had fixed prosthodontic appliances for at least a year ago. A complete periodontal clinical examination was performed and the following indices were recorded: plaque index (PLI), gingival index (GI), and clinical attachment loss (CAL). All data was recorded and analyzed by ANOVA test. Results: The clinical results of the present study confirmed the relationship among the mental retardation, fixed prosthodontic appliances and destruction of periodontal tissues. It has been found that the severity of periodontal disease increases among the study group compared to the control group. Statistically significant differences were found in PLI, GI and CAL in the comparison between group I and II (p Conclusion: There was a negative relationship between mental retardation with a status of periodontal tissues and oral hygiene among the patients under fixed prosthodontic management.
文摘<b><span style="font-family:Verdana;">Introduction:</span></b><span style="font-family:Verdana;"> I Do Biotech’s implants were developed starting in 2014. Since then, they obtained GMP and KFDA licenses for distribution in 2015. The main objective of this paper is to determine the survival rate of I Do Biotech implants five years after the first surgery.</span><span style="font-family:Verdana;"> </span><b><span style="font-family:Verdana;">Material and Methods:</span></b><span style="font-family:Verdana;"> 1000 implants were used on 480 prosthes</span><span style="font-family:Verdana;">e</span><span style="font-family:Verdana;">s across 10 clinics on 320 healthy, non-smoker and non-diabetic patients, chosen at random, of which 160 are male and 160 female, all in the age range of 30 to 50 years old. The failure rate was studied related to the patient’s gender, the length and diameter of the implant, anatomical location, the percentage of peri-implantitis, prosthodontic failures and the patient’s quality of life.</span><span style="font-family:Verdana;"> </span><b><span style="font-family:Verdana;">Discussion:</span></b><span style="font-family:Verdana;"> The results obtained are similar to those of Van Steenberghe D. Dieter-Busenlechner, E. Serrano Catauria and far superior to those of Sáenz Guzmán. Failure rates vary greatly from study to study due to the heterogeneity of the samples in the other research papers. </span><b><span style="font-family:Verdana;">Conclusion:</span></b><span style="font-family:Verdana;"> The overall implant failure rate at 5 years is 1.7%. The factors affecting significantly the survival rate are: the implant diameter, its length and the anatomic area. Failure ratios increase significantly when the diameter or the length of the implant decrease</span><span style="font-family:Verdana;">s</span><span style="font-family:Verdana;">, and when they are placed in the posterior maxilla (up to 4.3%).</span><span style="font-family:Verdana;"> </span><span style="font-family:Verdana;">The rate of peri-implantitis is 5.1%. The prosthodontic failure rate is 2.91%. The improvement in quality of life and satisfaction increases with the years.</span>
文摘Epilepsy has direct negative effects on sufferers’ general dental condition and oral health, both of which are further affected by inadequate oral hygiene;poor oral hygiene itself is often also caused by epilepsy-related poor health. Consequently, tooth loss, caries and periodontal disease occur increasingly often in epilepsy sufferers and they need more dental treatment. However, in fact the epileptic patients can receive fewer and simpler treatment modalities. The aim of this study was to review and synthesize recent studies on dental treatment in epilepsy patients and to mention potential triggers for seizures in dental practice.
基金supported by the National Natural Science Foundation of China(62172257)the Natural Science Foundation of Shandong Province(Major Basic Research)project(ZR2024ZD12)the HPC Platform of ShanghaiTech University.
文摘Designing a functional occlusal surface for denture crowns is a complex and important task in prosthodontics.Manual design is time-consuming and heavily relies on the dentist's experience,as it requires careful consideration of occlusal function.Due to the limitations of manual design,the field has turned to data-driven methods for occlusal surface design.However,many of these methods neglect critical geometric details,such as normals and curvature,impacting the quality of the occlusal surface.In this paper,we introduce Diff-OSGN,a novel denture crown occlusal surface generation network based on a denoising diffusion model,which focuses on generating the detailed geometric structure of denture crowns.We model the occlusal surface as a geometry map based on the occlusal plane,incorporating height and normal maps rasterized from intra-oral crown scanning.Both maps represent occlusal surface geometry,and their combination further enhances these details.Considering the crucial occlusal information,we extract features from the geometry maps of adjacent and occlusal teeth,using them as conditions in the reverse diffusion process to train our network for optimal occlusal function.Additionally,we define three geometric operators and corresponding loss functions as constraints to better extract geometric features of the target occlusal surface,such as ridges and grooves,for adequate supervision.Our results demonstrate that Diff-OSGN provides quantitatively and qualitatively superior performance than competing baselines and state-of-the-art methods.
