The aim of this study is to investigate the influence of different posts on the fracture mechanics of endodontically-treated teeth with open apex. Forty-eight human maxillary anterior teeth were collected, and the roo...The aim of this study is to investigate the influence of different posts on the fracture mechanics of endodontically-treated teeth with open apex. Forty-eight human maxillary anterior teeth were collected, and the root was transversely sectioned 12 mm under the cementoenamal junction （CEJ）. These samples were then randomly divided into two groups, i.e., minor diameter open apex root （group A） and major diameter open apex root （group B）, with mineral trioxide aggregate （MTA） placed into the apical 4 mm in the root canals. Subsequently, both groups were respectively further divided into three subgroups as follows： fiber-post （subgroup 1）, metal post （subgroup 2） and non-post （subgroup 3） group. Teeth were restored with a composite resin crown and tested by using a universal testing machine at the rate of 1 mm/min cross-head. Values of the maximum fracture resistance and failure patterns were recorded and compared among all subgroups. In addition, the changes of MTA properties were carefully examined via X-ray photography. Our results indicate that （1） In group A, the mean value of fracture resistance for teeth restored with fiber posts were statistically higher than that with either metal post or non-post; （2） In group B, there was no statistically significant difference in the mean value of fracture resistance among three subgroups; （3） No statistical significance in the mean value of fracture resistance was found between group A and group B; （4） The failure modes of most samples （58%） were irreparable; （5） MTA in two teeth developed cracks after loading tests. In conclusion, endodontically-treated teeth restored with fiber posts are more resistant to fracture than those restored with either metal posts or non-post, and most of the fracture modes are catastrophic in nature.展开更多
The success rate of apexification is primarily determined by multiple factors,including the material used,the size of the open apex compared to the length of the root,and the technique used in each case.The main objec...The success rate of apexification is primarily determined by multiple factors,including the material used,the size of the open apex compared to the length of the root,and the technique used in each case.The main objective of this review was to provide an update on the present management of open apex to identify factors and circumstances that may influence the success of apexification using different materials and techniques.Future research on apexification should focus on how to treat open apices with wide periapical lesions without surgery.Previously,the predictability of these parameters with non-surgical procedures was uncertain,but now,with the use of a dental operating microscope,it has become more predictable.Another reason could be that extra visits are no longer required due to major advances in the armamentarium and materials used for apexification.展开更多
目的:明确氢氧化钙封药联合iRoot BP Plus根尖屏障术治疗恒牙根尖孔开放慢性根尖周炎的临床疗效及相关影响因素。方法:回顾性分析2021年1月至2023年12月苏州口腔医院治疗的74颗患牙。患牙均采用Vitapex封药1~35个月,病变控制或形成钙化...目的:明确氢氧化钙封药联合iRoot BP Plus根尖屏障术治疗恒牙根尖孔开放慢性根尖周炎的临床疗效及相关影响因素。方法:回顾性分析2021年1月至2023年12月苏州口腔医院治疗的74颗患牙。患牙均采用Vitapex封药1~35个月,病变控制或形成钙化屏障后行iRoot BP Plus根尖屏障术,术后随访12~47个月。记录性别、年龄、牙位、诊断类型、封药时间、病变面积、根尖孔直径及根尖周指数变化,分析其与疗效的关系。结果:总有效率为97.3%,治愈率82.4%。年龄、术前病变面积、随访时间、牙位、诊断类型与疗效相关(P<0.05);性别、封药时间及根尖孔直径与疗效无显著关联(P>0.05)。结论:本治疗方案疗效可靠,尤其适用于年轻、病变范围较小的非囊肿类前磨牙病例,延长随访有助于提升疗效。展开更多
One-step apexification using mineral trioxide aggregate(MTA) has been reported as an alternative treatment modality with more benefits than the use of long-term calcium hydroxide for teeth with open apex.However,ortho...One-step apexification using mineral trioxide aggregate(MTA) has been reported as an alternative treatment modality with more benefits than the use of long-term calcium hydroxide for teeth with open apex.However,orthograde placement of MTA is a challenging procedure in terms of length control.This case series describes the sequence of events following apical extrusion of MTA into the periapical area during a one-step apexification procedure for maxillary central incisor with an infected immature apex.Detailed long-term observation revealed complete resolution of the periapical radiolucent lesion around the extruded MTA.These cases revealed that direct contact with MTA had no negative effects on healing of the periapical tissues.However,intentional MTA overfilling into the periapical lesion is not to be recommended.展开更多
基金supported by a grant from a program of research and development of Hubei Province (No. 2008-BCC 001)
文摘The aim of this study is to investigate the influence of different posts on the fracture mechanics of endodontically-treated teeth with open apex. Forty-eight human maxillary anterior teeth were collected, and the root was transversely sectioned 12 mm under the cementoenamal junction （CEJ）. These samples were then randomly divided into two groups, i.e., minor diameter open apex root （group A） and major diameter open apex root （group B）, with mineral trioxide aggregate （MTA） placed into the apical 4 mm in the root canals. Subsequently, both groups were respectively further divided into three subgroups as follows： fiber-post （subgroup 1）, metal post （subgroup 2） and non-post （subgroup 3） group. Teeth were restored with a composite resin crown and tested by using a universal testing machine at the rate of 1 mm/min cross-head. Values of the maximum fracture resistance and failure patterns were recorded and compared among all subgroups. In addition, the changes of MTA properties were carefully examined via X-ray photography. Our results indicate that （1） In group A, the mean value of fracture resistance for teeth restored with fiber posts were statistically higher than that with either metal post or non-post; （2） In group B, there was no statistically significant difference in the mean value of fracture resistance among three subgroups; （3） No statistical significance in the mean value of fracture resistance was found between group A and group B; （4） The failure modes of most samples （58%） were irreparable; （5） MTA in two teeth developed cracks after loading tests. In conclusion, endodontically-treated teeth restored with fiber posts are more resistant to fracture than those restored with either metal posts or non-post, and most of the fracture modes are catastrophic in nature.
文摘The success rate of apexification is primarily determined by multiple factors,including the material used,the size of the open apex compared to the length of the root,and the technique used in each case.The main objective of this review was to provide an update on the present management of open apex to identify factors and circumstances that may influence the success of apexification using different materials and techniques.Future research on apexification should focus on how to treat open apices with wide periapical lesions without surgery.Previously,the predictability of these parameters with non-surgical procedures was uncertain,but now,with the use of a dental operating microscope,it has become more predictable.Another reason could be that extra visits are no longer required due to major advances in the armamentarium and materials used for apexification.
文摘目的:明确氢氧化钙封药联合iRoot BP Plus根尖屏障术治疗恒牙根尖孔开放慢性根尖周炎的临床疗效及相关影响因素。方法:回顾性分析2021年1月至2023年12月苏州口腔医院治疗的74颗患牙。患牙均采用Vitapex封药1~35个月,病变控制或形成钙化屏障后行iRoot BP Plus根尖屏障术,术后随访12~47个月。记录性别、年龄、牙位、诊断类型、封药时间、病变面积、根尖孔直径及根尖周指数变化,分析其与疗效的关系。结果:总有效率为97.3%,治愈率82.4%。年龄、术前病变面积、随访时间、牙位、诊断类型与疗效相关(P<0.05);性别、封药时间及根尖孔直径与疗效无显著关联(P>0.05)。结论:本治疗方案疗效可靠,尤其适用于年轻、病变范围较小的非囊肿类前磨牙病例,延长随访有助于提升疗效。
基金supported by the National Research Foundation(NRF) of Koreafunded by the Ministry of Education,Science and Technology(MEST) (No.2011-0014231,Dr.Seok-Wood Chang),Korea
文摘One-step apexification using mineral trioxide aggregate(MTA) has been reported as an alternative treatment modality with more benefits than the use of long-term calcium hydroxide for teeth with open apex.However,orthograde placement of MTA is a challenging procedure in terms of length control.This case series describes the sequence of events following apical extrusion of MTA into the periapical area during a one-step apexification procedure for maxillary central incisor with an infected immature apex.Detailed long-term observation revealed complete resolution of the periapical radiolucent lesion around the extruded MTA.These cases revealed that direct contact with MTA had no negative effects on healing of the periapical tissues.However,intentional MTA overfilling into the periapical lesion is not to be recommended.
