New criteria for evaluating shear adhesion of newly developed ceramic brackets to different basic designs

Abstract

This study is designed to provide a new evaluation criterion for the evaluation of shear adhesion of newly developed ceramic brackets to different base designs. Methods/Statistical analysis: The parentheses are selected for testing. Bracket was evaluated for a variety of design characteristics. The brackets used in the tests are W1 (World Bio Tech Co., Ltd., Korea), Clarity ADVANCED (3M Unitek, USA), and Crystaline (TOMY Inc., Japan) respectively. SEM (TM-3000, Hitachi) with lateral and surface area considering surface roughness using optical contactless surface shape measuring devices (ContourGT, Braker, USA) Findings: Our study shows that the base shape of the bracket affects shear adhesion. In the three brackets that conducted the experiment, the shear adhesion(kg/base) ranked 3m, tomy and W1. Lateral area and surface area of 3M is lower than Tomy, but the bond strength of 3M is higher than Tomy. Improvements/Applications: The size and basic design of brackets can influence the adhesion. It was assumed that the larger the bracket base size, the greater the adhesion, the different results were actually. This shows the error of the existing evaluation method, which evaluates adhesion by only a simple horizontal area. In this study, ceramic brackets from other manufacturers have significantly different underlying surface area. Therefore, the assessment of true adhesion must reflect this new criterion, the surface area, not the simple base size.