Root Fracture of Abutment Teeth for Partial Removable Dental Prostheses.
Root Fracture of Abutment Teeth for Partial Removable Dental Prostheses.
复制标题
部分可摘义齿的基牙根部骨折。
DOI：
10.11607/ijp.4327
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Maeda Y.
中科院分区：
文献类型：
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作者：
Mizuno Y;Gonda T;Takahashi T;Tomita A;Maeda Y.
根折是基牙缺失的一种常见而严重的原因.迄今为止，还没有研究全面评估增加基牙应力的因素的单独贡献。本研究的目的是分析的应力分布在基牙的三维有限元模型的基础上，并分析影响应力distribution.Materials和methodsModels的因素，从计算机断层扫描数据的一个单一的病人，包括下颌第二前磨牙基牙，骨，残留的粘膜，和一个部分可拆卸的牙科修复体（PRDP）。使用不同类型的根管桩核制备四种模型。Akers卡环用于模拟PRDP，并向PRDP的咬合面施加垂直载荷。模拟桩与根之间的脱粘。降低剩余牙槽嵴的杨氏模量，以模拟义齿基托和剩余牙槽嵴之间的不良配合。结果非金属桩模型和近中支托模型均能降低基牙根部的应力集中。模拟脱粘和拟合差的模型中应力增加。多元线性回归分析的结果证实，脱粘和配合不良显着相关的根stress.ConclusionWithin本研究的局限性，这表明，桩的粘结完整性和适当的适合的义齿基托是重要的因素，影响寿命的基牙PRDP。
PurposeRoot fracture is a common and serious cause of abutment tooth loss. No studies to date have comprehensively assessed the individual contributions of the factors that increase stress on abutment teeth. The purpose of this study was to analyze the stress distribution in abutment teeth based on a three-dimensional finite element model and to analyze the factors that affect stress distribution.Materials and methodsModels were generated from the computed tomography data of a single patient, consisting of a mandibular second premolar abutment tooth, bone, residual mucous membrane, and a partial removable dental prosthesis (PRDP). Four models were prepared using different types of endodontic posts and cores. Akers clasps were used for the simulated PRDPs, and a vertical load was applied to the occlusal surface of the PRDPs. Debonding between the post and root was simulated. The Young modulus of the residual ridge was reduced to simulate a poor fit between the denture base and the residual ridge. Stress distribution in the abutment tooth root was observed, and the maximum principal stress was evaluated.ResultsThe nonmetal post model and the mesial rest model reduced stress concentration in the root. The stress increased in models simulating debonding and poor fit. The results of the multiple linear regression analysis confirmed that debonding and poor fit were significantly associated with root stress.ConclusionWithin the limitations of this study, it is suggested that the bonding integrity of posts and adequate fit of the denture base are important factors affecting the longevity of abutment teeth for PRDPs.