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Volume 2016, Article ID 4856285, 5 pages
Research Article

Evaluation of Er,Cr:YSGG Laser Effect on Microshear Bond Strength of a Self-Adhesive Flowable Composite in the Dentin of Permanent Molar: An In Vitro Study

1Pediatric Department, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
2Pediatric Department, Faculty of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd 8914815667, Iran
3Pediatric Department, Faculty of Dentistry, Shahed University of Medical Sciences, Tehran, Iran
4Private Practice, Tehran, Iran
5Faculty of Economics, University of Tehran, Tehran, Iran

Received 27 December 2015; Revised 16 May 2016; Accepted 30 May 2016

Academic Editor: Bai Chuang Shyu

Copyright © 2016 Masoumeh Moslemi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Aim and Background. Recently, new restorative materials such as self-adhesive flowable composites, because of their simple use and no need to bonding and etching, are considered important, particularly in pediatric dentistry. The aim of this study is to evaluate the effect of Er,Cr:YSGG laser on microshear bond strength of self-adhesive flowable composite on permanent teeth dentin in vitro. Material and Methods. In this experimental study, 40 dentin sections were prepared from healthy third molars and divided into two groups according to their surface preparation by Er,Cr:YSGG laser or without laser, only with silicon carbide paper. In each group, two groups of 10 teeth were treated with self-adhesive flowable composite (Dyad) and conventional flowable composite (acid etch and bonding). Samples were stored in normal saline and after 48 hours their bond strength was measured. The failure mode of samples was observed on stereomicroscope. In order to analyse the results, the one way ANOVA and Tukey’s test for multiple comparisons were used. Result. The maximum bond strength was related to conventional flowable composite with laser preparation group (24/21 Mpa). The lowest one was seen in Dyad composite without laser emitting (9/89 Mpa). The statistical difference between this two groups was significant ( value = 0/0038). The microshear bond strength differences between Dyad composite groups with laser preparation (mean = ) and without laser preparation (mean = ) were statistically significant too ( value = 0/01). Conclusion. Self-adhesive flowable composite has lower microshear bond strength than conventional flowable composite. Moreover, the laser irradiation as a surface treatment can improve this bond strength.