학술논문

Bond strength of adhesive systems to Er,Cr:YSGG laser-irradiated dentin
Document Type
Report
Source
Photomedicine and Laser Surgery. November 1, 2011, Vol. 29 Issue 11, p747, 6 p.
Subject
Brazil
Language
English
ISSN
1549-5418
Abstract
Introduction STUDIES HAVE SHOWN THAT laser-irradiated dentinal tissue yields lower bond strengths than does nonirradiated dentin. Both Er:YAG (2.94 µm) and Er,Cr:YSGG (2.78 µm) lasers present high interaction with hard [...]
Objective: The purpose of this study was to evaluate the effects of Er,Cr:YSGG laser irradiation and different adhesive procedures on bond strength of two bonding agents to dentin. Background data: Studies have shown that laser-irradiated dentinal tissue yields lower bond strengths than does nonirradiated dentin. In this study, different treatment methods of laser irradiating dentin were studied to enhance the bond strength of bonding agents to nonirradiated dentin. Methods: Third molars were wet ground with SiC until the occlusal flat dentin surface was exposed, and the teeth were randomly assigned to six groups (n = 5). A two-step self-etching primer (Clearfil SE Bond, G1) and a two-step etch-and-rinse adhesive (Single Bond Plus, G2) were applied to the nonirradiated dentin surface according to manufacturer's instructions, as control groups. In G3 and G4, the same adhesives were applied after Er,Cr:YSGG laser irradiation, whereas in G5 and G6 adhesives were applied after Er,Cr:YSGG laser irradiation, phosphoric acid etching, and NaOCl deproteinization of etched dentin. The Er,Cr:YSGG laser worked at 2.78 im and the repetition rate was fixed at 20 Hz. Composite blocks were built on bonded surfaces and the teeth were stored for 24 h at 37°C. Restored teeth were vertically and serially sectioned to obtain bonded specimens for the bond strength test. Data were analyzed by two-way ANOVA and Tukey test (α = 5%). Results: Laser irradiation reduced bond strengths for the two adhesives, regardless of acid etching and deproteinization of dentin post-irradiation (p