Marginal bone loss during bone healing exists around non-submerged dental implants. The aim of this study was to identify the relationship between different degrees of marginal bone loss during bone healing and the sa...Marginal bone loss during bone healing exists around non-submerged dental implants. The aim of this study was to identify the relationship between different degrees of marginal bone loss during bone healing and the salivary microbiome. One hundred patients were recruited, and marginal bone loss around their implants was measured using cone beam computed tomography during a 3-month healing period. The patients were divided into three groups according to the severity of marginal bone loss.Saliva samples were collected from all subjected and were analysed using 16 SMiSeq sequencing. Although the overall structure of the microbial community was not dramatically altered, the relative abundance of several taxonomic groups noticeably changed. The abundance of species in the phyla Spirochaeta and Synergistetes increased significantly as the bone loss became more severe. Species within the genus Treponema also exhibited increased abundance, whereas Veillonella, Haemophilus and Leptotrichia exhibited reduced abundances, in groups with more bone loss. Porphyromonasgingivalis, Treponemadenticola and Streptococcus intermedius were significantly more abundant in the moderate group and/or severe group. The severity of marginal bone loss around the non-submerged implant was associated with dissimilar taxonomic compositions. An increased severity of marginal bone loss was related to increased proportions of periodontal pathogenic species. These data suggest a potential role of microbes in the progression of marginal bone loss during bone healing.展开更多
Background: Periodontal disease is a bacterial infection that causes bone resorption of bone supporting teeth and leads to change in the normal architecture of the alveolar process. There are instances where the techn...Background: Periodontal disease is a bacterial infection that causes bone resorption of bone supporting teeth and leads to change in the normal architecture of the alveolar process. There are instances where the technique sensitive nature of restorative procedures or the faulty restorative margins may inadvertently lead to conditions which could bring about periodontal disease/ destruction. Therefore, this study was designed to determine the impact of dental restorations type on marginal bone among some patients being treated for chronic periodontitis. Material and Methods: Three hundred patients from the periodontics clinics in college of dentistry, King Khalid university were participated in our study. A total of 292 patients completed the study, 152 males and 140 female. They were divided according to dental reconstructions into three groups: Group I was without dental reconstructions (control group), group II patients received amalgam class II fillings and group III received fixed bridge denture. Plaque index (PLI) gingival index (GI), clinical attachment loss (CAL) and marginal bone loss (MBL) were recorded. All data were collected and were analyzed by ANOVA test. Results: In the present study, the restored teeth revealed significantly higher mean values for PLI, GI, CAL and MBL than the non-restored teeth (p-value Conclusion: Although the limitations of the present study, the patients in group II had the highest clinical attachment loss and value of marginal bone loss which can explain the more extension of amalgam fillings into subgingival direction, leading to increased plaque accumulation and increased periodontal destruction.展开更多
为了解决事件行人重识别领域(event-based person ReID)中事件流噪声问题和类间不平衡问题,提出了一种基于时空协同滤波的事件行人重识别方法(SCF-Net)。该方法包含时空协同滤波器和局部代理稀疏性学习模块两个部分。时空协同滤波器通...为了解决事件行人重识别领域(event-based person ReID)中事件流噪声问题和类间不平衡问题,提出了一种基于时空协同滤波的事件行人重识别方法(SCF-Net)。该方法包含时空协同滤波器和局部代理稀疏性学习模块两个部分。时空协同滤波器通过利用真实事件之间的时空协同特性来区分真实事件和噪声事件,并滤除噪声事件,以消除事件流中噪声的影响。局部代理稀疏性学习模块考虑了行人特征之间的差异性,通过将行人实例特征映射到局部代理域,并强制各代理互相远离,在特征空间中得到了清晰的类别边界。在Event-ReID数据集上的实验表明,与目前先进的事件行人重识别方法相比,SCF-Net方法取得了较大的性能提升,mAP指标提升了6.9%,Rank-1指标提升了4.4%。展开更多
边缘骨吸收(marginal bone loss,MBL)是衡量种植修复成功率与种植体颈部设计优劣的重要指标,牙种植体颈部处于种植体、基台、边缘骨、软组织四者交界的特殊区域,其外形、结构、材料、表面处理等对种植体的长期稳定性和维持边缘骨水平起...边缘骨吸收(marginal bone loss,MBL)是衡量种植修复成功率与种植体颈部设计优劣的重要指标,牙种植体颈部处于种植体、基台、边缘骨、软组织四者交界的特殊区域,其外形、结构、材料、表面处理等对种植体的长期稳定性和维持边缘骨水平起着至关重要的作用。颈部设计的目的是减少种植体周围骨组织所受应力、利于形成稳定的软组织封闭,从而减少边缘骨吸收,提升种植修复的长期功能性、稳定性及美观性。本文分别对软组织水平(tissue level,TL)种植体与骨水平(bone level,BL)种植体颈部设计的特点及其对边缘骨吸收的影响进行综述,为临床上选择不同颈部设计的种植体类型提供参考。展开更多
基金supported by grants from the National Natural Science Foundation of China(NSFC8137117381571001)+2 种基金State Key Laboratory of Oral Diseases(SKLOD201704)International Team for Implantology(Grant No.975_2014,Basel,Switzerland)to Quan Yuanthe National Key R&D Program of China during the 13th Five-Year Plan(2016YFC1102700)to Xue-Dong Zhou
文摘Marginal bone loss during bone healing exists around non-submerged dental implants. The aim of this study was to identify the relationship between different degrees of marginal bone loss during bone healing and the salivary microbiome. One hundred patients were recruited, and marginal bone loss around their implants was measured using cone beam computed tomography during a 3-month healing period. The patients were divided into three groups according to the severity of marginal bone loss.Saliva samples were collected from all subjected and were analysed using 16 SMiSeq sequencing. Although the overall structure of the microbial community was not dramatically altered, the relative abundance of several taxonomic groups noticeably changed. The abundance of species in the phyla Spirochaeta and Synergistetes increased significantly as the bone loss became more severe. Species within the genus Treponema also exhibited increased abundance, whereas Veillonella, Haemophilus and Leptotrichia exhibited reduced abundances, in groups with more bone loss. Porphyromonasgingivalis, Treponemadenticola and Streptococcus intermedius were significantly more abundant in the moderate group and/or severe group. The severity of marginal bone loss around the non-submerged implant was associated with dissimilar taxonomic compositions. An increased severity of marginal bone loss was related to increased proportions of periodontal pathogenic species. These data suggest a potential role of microbes in the progression of marginal bone loss during bone healing.
文摘Background: Periodontal disease is a bacterial infection that causes bone resorption of bone supporting teeth and leads to change in the normal architecture of the alveolar process. There are instances where the technique sensitive nature of restorative procedures or the faulty restorative margins may inadvertently lead to conditions which could bring about periodontal disease/ destruction. Therefore, this study was designed to determine the impact of dental restorations type on marginal bone among some patients being treated for chronic periodontitis. Material and Methods: Three hundred patients from the periodontics clinics in college of dentistry, King Khalid university were participated in our study. A total of 292 patients completed the study, 152 males and 140 female. They were divided according to dental reconstructions into three groups: Group I was without dental reconstructions (control group), group II patients received amalgam class II fillings and group III received fixed bridge denture. Plaque index (PLI) gingival index (GI), clinical attachment loss (CAL) and marginal bone loss (MBL) were recorded. All data were collected and were analyzed by ANOVA test. Results: In the present study, the restored teeth revealed significantly higher mean values for PLI, GI, CAL and MBL than the non-restored teeth (p-value Conclusion: Although the limitations of the present study, the patients in group II had the highest clinical attachment loss and value of marginal bone loss which can explain the more extension of amalgam fillings into subgingival direction, leading to increased plaque accumulation and increased periodontal destruction.
文摘为了解决事件行人重识别领域(event-based person ReID)中事件流噪声问题和类间不平衡问题,提出了一种基于时空协同滤波的事件行人重识别方法(SCF-Net)。该方法包含时空协同滤波器和局部代理稀疏性学习模块两个部分。时空协同滤波器通过利用真实事件之间的时空协同特性来区分真实事件和噪声事件,并滤除噪声事件,以消除事件流中噪声的影响。局部代理稀疏性学习模块考虑了行人特征之间的差异性,通过将行人实例特征映射到局部代理域,并强制各代理互相远离,在特征空间中得到了清晰的类别边界。在Event-ReID数据集上的实验表明,与目前先进的事件行人重识别方法相比,SCF-Net方法取得了较大的性能提升,mAP指标提升了6.9%,Rank-1指标提升了4.4%。
文摘边缘骨吸收(marginal bone loss,MBL)是衡量种植修复成功率与种植体颈部设计优劣的重要指标,牙种植体颈部处于种植体、基台、边缘骨、软组织四者交界的特殊区域,其外形、结构、材料、表面处理等对种植体的长期稳定性和维持边缘骨水平起着至关重要的作用。颈部设计的目的是减少种植体周围骨组织所受应力、利于形成稳定的软组织封闭,从而减少边缘骨吸收,提升种植修复的长期功能性、稳定性及美观性。本文分别对软组织水平(tissue level,TL)种植体与骨水平(bone level,BL)种植体颈部设计的特点及其对边缘骨吸收的影响进行综述,为临床上选择不同颈部设计的种植体类型提供参考。
