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托槽底座改良及其对粘结强度影响的有限元研究

Finite element study on modification of bracket base and its effects on bond strength.

作者信息

Shyagali Tarulatha R, Bhayya Deepak P, Urs Chandralekha B, Subramaniam Shashikala

机构信息

Department of Orthodontics and Dentofacial Orthopedics, Darshan Dental College and Hospital, Udaipur, India.

Department of Pediatric and Preventive Dentistry, Darshan Dental College and Hospital, Udaipur, India.

出版信息

Dental Press J Orthod. 2015 Mar-Apr;20(2):76-82. doi: 10.1590/2176-9451.20.2.076-082.oar.

DOI:10.1590/2176-9451.20.2.076-082.oar
PMID:25992991
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4445229/
Abstract

OBJECTIVE

This article aims to analyze the difference in stresses generated in the bracket-cement-tooth system by means of a peel load in single and double-mesh bracket bases using a three-dimensional finite element computer model.

MATERIAL AND METHODS

A three-dimensional finite element model of the bracket-cement-tooth system was constructed and consisted of 40,536 bonds and 49,201 finite elements using a commercial mesh generating programmer (ANSYS 7.0). Both single and double-mesh bracket bases were modified by varying the diameter from 100-400 µm progressively, and the spacing between the mesh wires was kept at 300 µm for each diameter of wire. A peel load was applied on the model to study the stresses generated in different layers.

RESULTS

In case of double-mesh bracket base, there was reduction in stress generation at the enamel in comparison to single-mesh bracket base. There was no difference in stress generated at the bracket layer between single and double-mesh bracket bases. At the impregnated wire mesh (IWM), layer stresses increased as the wire diameter of the mesh increased.

CONCLUSION

Results show that bracket design modification can improve bonding abilities and simultaneously reduce enamel damage while debonding. These facts may be used in bringing about the new innovative bracket designs for clinical use.

摘要

目的

本文旨在通过使用三维有限元计算机模型，分析单网和双网托槽基底在剥离载荷作用下，托槽 - 黏结剂 - 牙齿系统中产生的应力差异。

材料与方法

构建托槽 - 黏结剂 - 牙齿系统的三维有限元模型，使用商业网格生成程序（ANSYS 7.0），该模型由40,536个键和49,201个有限元组成。通过逐步将直径从100 - 400 µm变化来修改单网和双网托槽基底，并且对于每种网线直径，网线之间的间距保持在300 µm。在模型上施加剥离载荷以研究不同层中产生的应力。

结果

在双网托槽基底的情况下，与单网托槽基底相比，牙釉质中的应力产生有所减少。单网和双网托槽基底在托槽层产生的应力没有差异。在浸渍金属丝网（IWM）层，应力随着网丝直径的增加而增加。

结论

结果表明，托槽设计的修改可以提高黏结能力，同时在脱黏时减少牙釉质损伤。这些事实可用于实现新的创新托槽设计以供临床使用。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d28/4445229/54aea17873c0/dpjo-20-02-00076-gf06.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d28/4445229/86d0c3935113/dpjo-20-02-00076-gf01.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d28/4445229/d3da0c87a661/dpjo-20-02-00076-gf02.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d28/4445229/1da006bd3708/dpjo-20-02-00076-gf03.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d28/4445229/54aea17873c0/dpjo-20-02-00076-gf06.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d28/4445229/86d0c3935113/dpjo-20-02-00076-gf01.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d28/4445229/d3da0c87a661/dpjo-20-02-00076-gf02.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d28/4445229/1da006bd3708/dpjo-20-02-00076-gf03.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8d28/4445229/54aea17873c0/dpjo-20-02-00076-gf06.jpg

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