不同仿生粘结剂修复伴外吸收颈环缺陷的牙体中应力的有限元分析

Stresses in Teeth with External Cervical Resorption Defects Restored with Different Biomimetic Cements: A Finite Element Analysis.

机构信息

Department of Conservative Dentistry and Endodontics, Army College of Dental Sciences, Secunderabad, Telangana, India.

出版信息

J Endod. 2023 Aug;49(8):995-1003. doi: 10.1016/j.joen.2023.06.010. Epub 2023 Jun 22.

DOI:10.1016/j.joen.2023.06.010

PMID:37355164

Abstract

INTRODUCTION

This study compared the stress distributions in teeth with simulated external cervical resorption defects restored with different restorative materials and identified areas of high stress concentration.

METHODS

A maxillary central incisor created in a scanned model using HyperWorks software (Altair Engineering Inc, Troy, MI) served as the control. External cervical resorption defects based on Shanon Patel's classification were created (1Bd/2Bd/3Bd) in the scanned model. The defects were restored using mineral trioxide aggregate, Biodentine, glass ionomer cement, and Bioaggregate. On all the models, a force of 100 N was applied on the palatal aspect 2 mm incisal to the cingulum directed at 45° along the long axis of the tooth.

RESULTS

The stresses generated in dentin and cementum are less, with a restorative material having a high Young's modulus. For the 1Bd defect, MTA and Bioaggregate showed least stresses in dentin and cementum, respectively, whereas Biodentine had consistently lower stresses in dentin and cementum. Larger defects like 2Bd and 3Bd restored with Bioaggregate exhibited minimum stresses in dentin and cementum.

CONCLUSIONS

Bioaggregate and Biodentine replace dentin with maximum stress and maximum strain. Elastic moduli similar to or higher than dentin are preferred for restoring cervical third resorptive lesions of the tooth.

摘要

简介

本研究比较了不同修复材料修复模拟外颈部吸收缺陷后牙齿的应力分布，并确定了高应力集中区域。

方法

使用 HyperWorks 软件（Altair Engineering Inc，密歇根州特洛伊）扫描模型中创建的上颌中切牙作为对照。在扫描模型中创建了基于 Shanon Patel 分类的外颈部吸收缺陷（1Bd/2Bd/3Bd）。使用矿化三氧化物聚合体、Biodentine、玻璃离子水门汀和 Bioaggregate 修复缺陷。在所有模型上，在颊侧施加 100 N 的力，位于牙龈缘 2 毫米切向，以 45°的角度沿牙齿的长轴施加。

结果

具有高杨氏模量的修复材料产生的牙本质和牙骨质中的应力较小。对于 1Bd 缺陷，MTA 和 Bioaggregate 分别显示出牙本质和牙骨质中的最小应力，而 Biodentine 在牙本质和牙骨质中始终具有较低的应力。用 Bioaggregate 修复的较大缺陷（如 2Bd 和 3Bd）在牙本质和牙骨质中表现出最小的应力。