Er:YAG 레이저로 표면처리한 상아질에 대한 단일 단계 접착시스템의 결합

Abstract

Bonding of single-step adhesive systems to Er:YAG laser-irradiated dentin

Myung Goo Lee, D.D.S, M.S.D. Advisor : Young-Gon Cho, D.D.S., M.S.D., Ph.D. Department of Dentistry, Graduate School of Chosun University

The purpose of this study was to evaluate the influence of Er:YAG laser irradiation on the microshear bond strength (μSBS) to dentin of three single-step adhesive systems. Thirty extracted human molar teeth were sectioned to expose the occlusal dentinal surfaces of crowns and ground with 600 silicon carbide papers. The samples were divided into six groups according to laser irradiation of dentin surface and types of single-step adhesive systems. LP group: Adper Prompt L-Pop (3M ESPE), LP-L group: Er:YAG laser (KEY Laser 3, KaVo) + Adper Prompt L-Pop, GB group: G-Bond (GC), GB-L group: Er:YAG laser + G-Bond, AB group: ALL-Bond SE (Bisco), AB-L group: Er:YAG laser + ALL-Bond SE. The samlpes were subjected to μSBS testing 24 hours after bonding. Statistical analysis was carried out by two-way ANOVA, t-test and Tukey post hoc test (p=0.05). In addition, scanning microscopic evaluation was made on the resin-dentin interfaces of six specimens. The results of this study were as follows; 1. There was no significant difference among the μSBS of LP, GB, AB groups, but the μSBS of LP-L and AB-L groups were significantly higher than that of GB-L group ( p<0.05). 2. Most of failure modes were mixed in all groups, but more adhesive failure was seen in the laser irradiated groups than in no laser groups. 3. Other groups except GB-L group showed close adaptation at the interface of dentin and composite resin. 4. Rod shaped-long resin tags and lateral branches of tags were observed in LP, GB, AB groups, but very short or fractured resin tags were observed in LP-L, GB-L, AB-L groups.

It was concluded that the use of Er:YAG laser would lower the bonding strength of composite resin to dentin depending on the type of single-step adhesive systems used.