加载方式对用两种系统粘结的正畸托槽粘结强度的影响。

Effect of loading mode on bond strength of orthodontic brackets bonded with 2 systems.

作者信息

Katona Thomas R, Long Robert W

机构信息

Indiana University School of Dentistry, and mechanical engineering, Purdue University School of Engineering and Technology, Indianapolis, Ind, USA.

出版信息

Am J Orthod Dentofacial Orthop. 2006 Jan;129(1):60-4. doi: 10.1016/j.ajodo.2004.09.020.

DOI:10.1016/j.ajodo.2004.09.020

PMID:16443480

Abstract

INTRODUCTION

A new orthodontic bracket bonding method or material invariably spawns bond strength studies examining the efficacy of the innovation. The primary purpose of this project was to ascertain whether the mode of in-vitro bracket debonding used in a study affects the measured bond strength. The secondary aim was to compare the bond strengths of 2 different bonding systems.

METHODS

Flattened stainless steel orthodontic brackets were bonded to flattened bovine enamel with a resin composite bonding agent (Transbond XT, 3M Unitek, Monrovia, Calif). The enamel was prepared with traditional acid etching and priming (37% phosphoric acid gel and Transbond XT Primer, 3M Unitek) or a single-step method (Transbond Plus, 3M Unitek) that combined etching and priming. Cement thickness was kept constant, and bonding was done under controlled temperature and humidity. Brackets were debonded in shear-peel, tension, or torsion.

RESULTS

When tested in shear-peel mode, traditional etching and priming produced a stronger bond than the single-step self-etch system. When tested in tension, the traditional bond was weaker than the single-step bond, and when tested in torsion, the bond strengths were similar.

CONCLUSIONS

Bond strength can vary depending on the method of testing. Claims of clinical efficacy might not be valid.

摘要

引言

一种新的正畸托槽粘结方法或材料总会引发关于该创新效果的粘结强度研究。本项目的主要目的是确定研究中使用的体外托槽脱粘方式是否会影响所测量的粘结强度。次要目的是比较两种不同粘结系统的粘结强度。

方法

将扁平的不锈钢正畸托槽用树脂复合粘结剂（Transbond XT，3M Unitek，蒙罗维亚，加利福尼亚州）粘结到扁平的牛牙釉质上。牙釉质采用传统的酸蚀和底漆处理（37%磷酸凝胶和Transbond XT底漆，3M Unitek）或一种将蚀刻和底漆处理相结合的单步方法（Transbond Plus，3M Unitek）进行制备。粘结剂厚度保持恒定，粘结在受控的温度和湿度条件下进行。托槽通过剪切 - 剥离、拉伸或扭转方式脱粘。