Construction and Analysis of Finite Element Models for Oval Root Canals after Preparation with Micro-Crack
10.16156/j.1004-7220.2024.04.023
- VernacularTitle:预制裂纹的预备后椭圆形根管牙根有限元模型构建及分析
- Author:
Ci CHEN
1
,
2
;
Tong WANG
;
Huiying LI
;
Jing FU
;
Jinghan GUO
;
Haiping XU
Author Information
1. 青岛大学附属医院 口腔内科,山东 青岛 266003
2. 青岛大学 口腔医学院,山东 青岛 266003
- Keywords:
oval canals;
root canal preparation;
micro-cracks;
stress distribution
- From:
Journal of Medical Biomechanics
2024;39(4):724-729
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the stress distributions of two root canal preparation shapes of oval root canals with micro-crack.Methods Twenty single-canal mandibular premolars with oval canals were expanded to create micro-cracks.Roots were sectioned after staining.The generation and distribution of dentin micro-cracks were observed under microscope.Then a finite element(FE)model of sectioned enlarged oval canal roots with micro-cracks was established.The stress distribution of micro-crack and root were analyzed under lateral loading.Results Cracks always appeared in the buccolingual sides of oval canal roots and extended from the intracanal wall to the root surface.This was consistent with the stress concentration on the buccolingual side of the root canal wall shown by FE analysis.When micro-cracks occurred,stresses were transferred to the crack tip and the peak values increased sharply nearly 5 times.This made the cracks propagate easily along this direction,especially in the long axis direction of the tooth.Conclusions The presence of micro-cracks does not change the general stress concentration on root with two preparation morphologies of oval canals.However,the micro-crack causes an extreme stress concentration in the crack tip.This may be the mechanism of rapid propagation of microcracks into vertical root fracture,and dentists need to pay high attention.
