Vasudeva Gaurav, Bogra Poonam
Department of Conservative Dentistry and Endodontics, Gian Sagar Dental College and Hospital, Banur, Dist. Patiala, Punjab, India.
J Conserv Dent. 2008 Jul;11(3):117-20. doi: 10.4103/0972-0707.45250.
Abfraction, a type of non-carious cervical tooth loss, is a poorly understood condition. One factor thought to contribute to the development of these lesions is the effect of occlusal loading and the presence of occlusal restoration.
The aim of this paper is to study the stress profile in the cervical region of mandibular first premolar with variation of occlusal loads, and to compare the stress profile between sound and occlusally restored tooth under variation of occlusal load, using two-dimensional plane strain finite element model.
A mandibular first premolar was sectioned and modeled in the finite element software, along with its peridontium. Varying occlusal loads were applied along the cuspal inclines, with and without an occlusal restoration. The software used was NISA II EMRC.
It was found that higher occlusal loads caused more cuspal flexure and that the maximum shear stress was much higher and closer to the cervical area. It was also observed that there was a slight increase in shear stress when occlusal restoration was present.
It was suggested that high occlusal loading and the presence of an occlusal amalgam restoration increased the stress concentration at the cervical area, which may lead to the breakdown of enamel at the cervical region.
非龋性颈部牙齿丧失的一种类型——楔状缺损，是一种了解较少的情况。被认为促成这些损害发展的一个因素是咬合负荷的影响以及咬合修复体的存在。
本文的目的是使用二维平面应变有限元模型，研究下颌第一前磨牙颈部区域在咬合负荷变化时的应力分布，并比较在咬合负荷变化情况下完好牙齿与有咬合修复牙齿之间的应力分布。
将一颗下颌第一前磨牙连同其牙周组织进行切片并在有限元软件中建模。沿牙尖斜面施加不同的咬合负荷，有或没有咬合修复体。使用的软件是NISA II EMRC。
发现较高的咬合负荷会导致更多的牙尖弯曲，并且最大剪应力更高且更靠近颈部区域。还观察到存在咬合修复体时剪应力略有增加。
有人提出，高咬合负荷和咬合汞合金修复体的存在会增加颈部区域的应力集中，这可能导致颈部区域牙釉质的破坏。
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