A STUDY OF SHEAR BOND STRENGTH OF ER:YAG LASER-IRRADIATED PRIMARY DENTIN

Lee, Jin-Hwa; Kim, Jong-Soo; Yoo, Seung-Hoon

Journal of the Korean Academy of Pediatric Dentistry 2007;34(4):569-578.
Published online November 30, 2007.

A STUDY OF SHEAR BOND STRENGTH OF ER:YAG LASER-IRRADIATED PRIMARY DENTIN

Jin-Hwa Lee, Jong-Soo Kim, Seung-Hoon Yoo

Dept. of Pediatric Dentistry, School of Dentistry, Dankook University

Er:YAG 레이저를 조사한 유치 상아질의 전단결합강도에 관한 연구

이진화, 김종수, 유승훈

단국대학교 치과대학 소아치과학교실

Correspondence: Jong-Soo Kim, Tel: 82-41-550-1931, 2, Fax: 82-41-555-2329, Email: jskim@dku.edu

Abstract

This study was performed to compare the shear bond strength of self etching system and two bottle bonding system with or without laser preparation. Group Ⅰ was prepared with high speed rotary instrument and Prompt^TM L-Pop^TM, group Ⅱ with Er:YAG laser and Prompt^TM L-Pop^TM, group Ⅲ with Er:YAG laser, 37% phosphoric acid and Single bond, group Ⅳ with Er:YAG laser and Single bond and group Ⅴ with high speed, etching and Single bond. And also observation of the prepared and etched dentin surface were performed under scanning electro-microscope. The possibility of clinical application of laser preparation which might have an advantage to reduce pain for children with less unfavorable noise were evaluated. The results obtained are as follows; 1. Group Ⅴ showed significantly higher bond strength than other groups. And group Ⅳ showed significantly lower bond strength than other groups. 2. There was no significant difference between group Ⅰ and group Ⅲ. 3. Group Ⅱ showed significantly lower bond strength than group Ⅰ, Ⅲ, Ⅴ, but showed significantly higher bond strength than group Ⅳ. 4. Under scanning electro-microscope, laser-preparated dentin surface showed high irregularity and no smear layer. The surface showed less irregularities and more exposed dentinal tubules with etching. Laser preparation has many advantages over conventional tooth preparation. But this method showed lower resin bonding strength. Laser preparated tooth surface differed from the conventionally preparated tooth surface. More researches are needed on suitable methods for laser preparated dentin surface.

Key Words: Shear bond strength, Er:YAG laser, Primary teeth dentin, Dentin bonding system