Table of Contents
International Scholarly Research Notices
Volume 2015, Article ID 243615, 7 pages
http://dx.doi.org/10.1155/2015/243615
Research Article

Enamel and Dentin Surface Finishing Influence on the Roughness and Microshear Bond Strength of a Lithium Silicate Glass-Ceramic for Laminate Veneers

1Graduate Program in Dentistry, Positivo University, 81280-330 Curitiba, PR, Brazil
2Positivo University, 81280-330 Curitiba, PR, Brazil
3Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, 17012-901 Bauru, SP, Brazil

Received 22 June 2015; Revised 18 August 2015; Accepted 19 August 2015

Academic Editor: Patricia Pereira

Copyright © 2015 Carla Castiglia Gonzaga 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.

Abstract

Objectives. This study evaluated the influence of cavity surface finishing with diamond burs of different grit mounted on high-speed turbine and ultrasound on the roughness and microshear bond strength (MBS) of a lithium silicate glass-ceramic to enamel and dentin. Methods. Enamel and dentin specimens were divided into seven groups, according to the type of surface finishing: 1200-grit sandpaper (control), two different brands of medium-grit and fine-grit diamond burs in a high-speed turbine; medium-grit and fine-grit CVD (chemical vapor deposition) tips in an ultrasonic device. Roughness parameters () and MSBS to a glass-ceramic () were determined. Data were analyzed using ANOVA and Tukey’s test ( = 5%). Results. Control group showed lower mean roughness readings and groups that used medium-grit diamond burs showed the highest mean roughness values. Regarding MSBS, there was no statistical difference when comparing the groups gritted with the same brand of medium- and fine-grit burs and tips. Conclusions. Cavity surface finishing influenced the roughness parameters and MSBS of a glass-ceramic to enamel and dentin. Medium-grit diamond burs in high-speed turbine showed the highest mean roughness values. Fine-grit CVD tips in ultrasound presented the highest MSBS values for both enamel and dentin.