title: Enamel and Dentin Surface Finishing Influence on the Roughness and Microshear Bond Strength of a Lithium Silicate Glass-Ceramic for Laminate Veneers.
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 (n = 5) and MSBS to a glass-ceramic (n = 10) were determined. Data were analyzed using ANOVA and Tukey's test (α = 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.
authors.affiliation: Graduate Program in Dentistry, Positivo University, 81280-330 Curitiba, PR, Brazil.
authors.forename: Carla Castiglia
authors.initials: CC
authors.lastname: Gonzaga
authors.affiliation: Positivo University, 81280-330 Curitiba, PR, Brazil.
authors.forename: Ruth Peggy
authors.initials: RP
authors.lastname: Bravo
authors.affiliation: Graduate Program in Dentistry, Positivo University, 81280-330 Curitiba, PR, Brazil.
authors.forename: Thiago Vinícius
authors.initials: TV
authors.lastname: Pavelski
authors.affiliation: Graduate Program in Dentistry, Positivo University, 81280-330 Curitiba, PR, Brazil.
authors.forename: Paula Pontes
authors.initials: PP
authors.lastname: Garcia
authors.affiliation: Graduate Program in Dentistry, Positivo University, 81280-330 Curitiba, PR, Brazil.
authors.forename: Gisele Maria
authors.initials: GM
authors.lastname: Correr
authors.affiliation: Graduate Program in Dentistry, Positivo University, 81280-330 Curitiba, PR, Brazil.
authors.forename: Denise Piotto
authors.initials: DP
authors.lastname: Leonardi
authors.affiliation: Graduate Program in Dentistry, Positivo University, 81280-330 Curitiba, PR, Brazil.
authors.forename: Leonardo Fernandes
authors.initials: LF
authors.lastname: da Cunha
authors.affiliation: Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, 17012-901 Bauru, SP, Brazil.
authors.forename: Adilson Yoshio
authors.initials: AY
authors.lastname: Furuse