Heat treatment of silanized feldspathic ceramic: Effect on the bond strength to resin after thermocycling

Author(s)

Goncalves de Figueiredo, Viviane Maria ^[1] ; Corazza, Pedro Henrique ^[2] ; Souto Lepesqueur, Laura Soares ^[1] ; Miranda, Geraldo M. ^[3] ; Pagani, Clovis ^[3] ; de Melo, Renata Marques ^[1] ; Valandro, Luiz Felipe ^[4]

Affiliation

^[1] Sao Paulo State Univ UNESP, Dept Dent Mat & Prosthodont, Inst Sci & Technol Sao Jose dos Campos, BR-12245000 Sao Paulo - Brazil

^[2] Univ Passo Fundo, Postgrad Program Dent, Sch Dent, BR-99001970 Passo Fundo, RS - Brazil

^[3] Sao Paulo State Univ UNESP, Dept Restorat Dent, Inst Sci & Technol Sao Jose dos Campos, BR-12245000 Sao Paulo - Brazil

^[4] Univ Fed Santa Maria, Prosthodont Unit, Fac Odontol, BR-97015372 Santa Maria, RS - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES; v. 63, p. 96-101, DEC 2015.
• Web of Science Citations: 2

Abstract

Purpose: This study aimed to evaluate the effect of heat treatment (at 77 degrees C) of a silanized feldspathic ceramic on microtensile bond strength (mu TBS) with a resin cement before and after being aged by thermocycling. Material and methods: Twenty-four blocks (12 x 10 x 4 mm(3)) of a CAD/CAM feldspathic ceramic (Vita-blocks Mark II, Vita) were obtained and randomly divided into three groups, according to the surface treatment prior to the cementation: Group AS - hydrofluoric acid 10%+silane; Group S77 - silane+heating at 77 degrees C for 60 s; and Group AS77 - hydrofluoric acid 10%+ silane+ heating at 77 degrees C for 60s. Ceramic blocks were cemented to composite resin blocks with a resin cement. The sets were subsequently cross-sectioned into 1 mm(2) beams for mu TBS testing. The beams of each group were randomly divided into two subgroups: aging (thermocycling, 12,000 cycles between 5 degrees C and 55 degrees C) and non-aging (tested immediately). One-way ANOVA and Tukey's test (alpha=0.05) and Weibull analysis (95% CI) were used to analyze the data. Results: Group AS77 had the lowest pre-test failure number during the cutting among the groups. There was no significant difference (p=0.255) between the mu TBS mean values of the non-aged groups. After aging, the mean value of S77 was significantly lower than those of AS77 and AS (p=0.005). There was no difference in the Weibull modulus (m) and characteristic strength (sigma(0)) of the aged and non-aged groups for all comparisons. Before aging, heat treatment of silanized feldspathic ceramic (non acid-etched surface) demonstrated bond strength similar to that achieved with hydrofluoric-acid-etching treatment however, it had lower bond strength after aging. Conclusion: The combination of hydrofluoric-acid-etching treatment with heat treatment silanized feldspathic ceramic did not improve the bond strength of the interface. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 12/10573-5 - Effect of heat treatment in the adhesion to silanized feldspathic ceramic and resin luting cement
• Grantee: Clovis Pagani
• Support type: Regular Research Grants