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Relationship between stress distribution and microleakage of cervical restorations under flexural load cycling

弯曲载荷循环下颈椎修复体应力分布与微渗漏的关系

基本信息

批准号：
10671793
负责人：
KUBO Shisei
金额：
$ 2.05万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10671793/
关键词：
Cervical lesions Bruxism Microleakage Finite element method Stress distribution Cavity forms Flexural load cycling Self-etching primer system

项目摘要

1. Shallow wedge-shaped and U-shaped cavities were prepared at cervical region on labial surfaces of bovine teeth and restored with self-etching primer adhesive systems which showed similar bond strength to enamel and dentin. Microleakage of these cavities were investigated under flexural loading which simulate bruxism (eccentric occlusal force). In the case of the Shallow wedge-shaped cavities, microleakage occurred only at the incisal walls, while in the U-shaped cavities, it occurred mainly at the apical walls.2. The strain, which were generated both at the incisal and apical walls by the same load as in the microleakage test, were determined using strain gauges. In the case of the Shallow wedge-shaped cavity, the incisal wall had a markedly greater strain than the apical wall. In the case of the U-shaped cavity, there was no significant difference in the magnitude of strain between the incisal and apical walls.3. Strain and stress distribution (around the cervical cavities) on the same conditions as microleakage test were mathematically analyzed by two-dimensional finite element method. The obtained data was compared with the strain gauge data. The results corroborated that our analytical models were useful to study stress distribution within the restored teeth. In the case of the Shallow wedge-shaped cavity, the incisal wall had significantly greater normal stress than the apical wall. In the case of the U-shaped cavity, the incisal wall had less normal stress than the apical wall. We plan to make three-dimensional models to investigate stress distribution as accurately as possible.4. The overall findings suggest that stress distribution induce by occlusal forces has an effect on the microleakage patterns of cervical resin composite restorations.

1. 在牛牙唇面颈区制备浅楔形和u形牙槽，采用自蚀刻底漆粘接系统修复，其与牙釉质和牙本质的结合强度相近。在模拟磨牙（偏心咬合力）的弯曲载荷下，研究了这些腔体的微泄漏。浅楔形腔只发生在切壁处，而u形腔主要发生在根尖壁处。在微泄漏试验中，在相同的荷载作用下，在切壁和顶壁处产生的应变用应变片测定。在浅楔形腔的情况下，切壁的应变明显大于根尖壁。在u型腔的情况下，切壁和根尖壁之间的应变大小没有显著差异。采用二维有限元法对与微泄漏试验相同条件下颈腔周围的应变和应力分布进行数学分析。所得数据与应变片数据进行了比较。结果证实了我们的分析模型对研究修复牙内应力分布是有用的。在浅楔形腔的情况下，切壁的法向应力明显大于根尖壁。在u型腔的情况下，切壁的正常应力小于根尖壁。我们计划制作三维模型以尽可能准确地研究应力分布。综上所述，咬合力引起的应力分布对颈椎树脂复合材料修复体的微渗漏模式有影响。