Comparison of microtensile bond strength on non-carious cervical lesions according to biofilm removal method

Sung,  Kun-Hwa; Min,  Jeong-Bum; Park,  Tae-Young

J Korean Dent Assoc > Volume 58(11); 2020 > Article

The Journal of The Korean Dental Association 2020;58(11):683-689.
Published online November 30, 2020.

생체막 제거 방법에 따른 비우식성 치경부 병소의 미세인장강도 비교

성건화¹, 민정범², 박태영³

^¹조선대학교 치과대학 치과보존학 교실
^²조선대학교 치과대학 치과보존학 교실
^³조선대학교 치과대학 치과보존학 교실

Comparison of microtensile bond strength on non-carious cervical lesions according to biofilm removal method

Kun-Hwa Sung¹, Jeong-Bum Min², Tae-Young Park³

¹Department of Conservative Dentistry, School of Dentistry, Chosun University
²Department of Conservative Dentistry, School of Dentistry, Chosun University
³Department of Conservative Dentistry, School of Dentistry, Chosun University

Abstract

Dentin surface of non-carious lesion is usually attached with oral biofilm. The biofilm should be removed before application of restorative material, because it may reduce the bond strength of adhesive system. The aim of this study was to evaluate the microtensile bond strength, when the biofilm was removed with brush or bur. Twenty extracted human third molars were sectioned horizontally to obtain dentin surface. Specimen were divided randomly into four group. Biofilm formation was performed in three group, except for Group 1 (negative control). Biofilm was removed as follows: Group 3, using ICB brush; Group 4, using lowspeed round bur #2. Group 2 (positive control) was not removed Biofilm. And in all four groups, the adhesive system (Optibond FL, Kerr) was applied to etched dentin surface, and resin composite was built up in three 1mm increments. After 24 hour storage in distilled water, the teeth were perpendicularly sectioned to obtain beams (1 × 1 mm2). Microtensile bond strength was measured and the data were statistically analyzed using one-way ANOVA and Tukey's post hoc test (p<0.05). Group 4 showed the highest microtensile bond strength (p<0.05), Group 3 showed no significant improvements when compared to Group 1. Group 2 showed lowest microtensile bond strength (p<0.05). When restoring a non-carious cervical lesion, it is essential to remove the biofilm present on the dentin surface. In addition, in the method of removing the biofilm, both the brush removal method and the bur removal method were effective.

Key Words: Microtensile bond strength;Non-carious cervical lesion;biofilm removal method;