脱粘力方向对正畸剪切粘结强度的影响。

Effect of debonding force direction on orthodontic shear bond strength.

作者信息

Klocke Arndt, Kahl-Nieke Bärbel

机构信息

Department of Orthodontics, University of Hamburg, School of Dental Medicine, Hamburg, Germany.

出版信息

Am J Orthod Dentofacial Orthop. 2006 Feb;129(2):261-5. doi: 10.1016/j.ajodo.2004.07.048.

DOI:10.1016/j.ajodo.2004.07.048

PMID:16473719

Abstract

INTRODUCTION

The aim of this study was to determine the influence of debonding force direction in shear bond strength testing of orthodontic brackets in vitro.

METHODS

One hundred fifty extracted bovine permanent mandibular incisors were randomly divided into 5 groups of 30 specimens each. Before bonding with a composite adhesive, enamel surfaces were etched with 37% phosphoric acid for 30 seconds. Teeth were bonded with mesh-based stainless steel orthodontic brackets. Shear bond strength was measured with a universal testing machine. Debonding forces were directed either parallel to the bracket base (group B), toward the enamel surface (group A: 15 degrees), or away from the enamel surface (group C: 15 degrees; group D: 30 degrees; group E: 45 degrees).

RESULTS

Shear bond strength measurements were as follows: 22.90 (SD, 1.72) MPa (group A), 17.90 (SD, 2.63) MPa (group B), 12.99 (SD, 1.71) MPa (group C), 7.93 (SD, 1.14) MPa (group D), and 6.65 (SD, 1.14) MPa (group E). Analysis of variance indicated that shear bond strengths were significantly different between the groups investigated. Mean adhesive remnant index scores ranged between 1.60 in group B and 2.13 in group D.

CONCLUSIONS

Shear bond strength measurements were significantly influenced by the direction of the debonding force, indicating the need for control and standardization of this testing parameter in orthodontic shear bond strength testing.

摘要

引言

本研究的目的是确定在体外正畸托槽剪切粘结强度测试中脱粘力方向的影响。

方法

150颗拔除的牛下颌恒切牙随机分为5组，每组30个样本。在用复合粘合剂粘结之前，用37%磷酸对牙釉质表面蚀刻30秒。牙齿用基于网的不锈钢正畸托槽粘结。用万能试验机测量剪切粘结强度。脱粘力方向分别为平行于托槽底座（B组）、朝向牙釉质表面（A组：15度）或远离牙釉质表面（C组：15度；D组：30度；E组：45度）。

结果

剪切粘结强度测量结果如下：22.90（标准差，1.72）MPa（A组），17.90（标准差，2.63）MPa（B组），12.99（标准差，1.71）MPa（C组），7.93（标准差，1.14）MPa（D组），6.65（标准差，1.14）MPa（E组）。方差分析表明，所研究的各组之间剪切粘结强度有显著差异。平均粘结剂残留指数得分在B组的1.60至D组的2.13之间。