Influence of ceramic thickness and light-curing time on the long-term µTBS of silica-based ceramic to human dentin

Autor: Marco Antonio Bottino, Rodrigo Othávio de Assunção e Souza, Carlos Augusto Pavanelli, Diana Capelli Barca, Dayanne Monielle Duarte Moura, Giovanna de Fátima Alves da Costa
Přispěvatelé: Universidade Estadual Paulista (Unesp), Federal University of Rio Grande do Norte (UFRN)
Rok vydání: 2017
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
ISSN: 1568-5616
0169-4243
DOI: 10.1080/01694243.2016.1274134
Popis: Made available in DSpace on 2018-12-11T17:30:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-08-03 To evaluate the influence of ceramic thickness, light-curing time and thermal cycling (TC) on the μTBS of a glass ceramic cemented to human dentin. Ninety-six human molars were embedded in acrylic resin and the occlusal surface was sectioned to exposure dentin. Blocks of feldspathic ceramic (Vita PM9) with different thickness (6 × 6 × 1 mm/2 mm/3 mm) were fabricated with wax pattern and sprue. The blocks and teeth were randomly distributed into 12 groups (n = 8) according to the ceramic thickness (V1: 1 mm, V2: 2 mm and V3: 3 mm), light-curing time (40s; 80s), and TC (yes; no). Dentin was etched, washed and dried. The adhesive (Excite, Ivoclar) was applied onto the dentin surface and light-cured (20s), and the ceramic surface was etched with 10% HF, washed, dried and silanized. The ceramic blocks were cemented to dentin (Variolink II, Ivoclar). The assembly ceramic/dentin was stored in distilled water (37 °C; 24 h) and sectioned in X and Y axes to get the sticks. Half of the samples were submitted to TC while the other half underwent micro-tensile bond testing. The data (MPa) were analyzed by 3-way ANOVA and Tukey test (5%). ANOVA revealed significant interaction among the factors (p = 0.0001). Tukey test showed significant higher bond strength for the 2 mm group (V280s = 17.0 ± 9.1 MPa) in comparison to the other groups. V340s TC (2.7 ± 6.3 MPa) presented lower bond strength, which was similar to the groups V180s TC (4.6 ± 4.9 MPa) and V240s TC (5.9 ± 4.4 MPa). Light-curing for 80s promoted significant higher bond strength of thicker ceramic (3 mm) than light-curing for 40s. Department of Restorative Dentistry São Paulo State University (UNESP) Department of Dentistry Federal University of Rio Grande do Norte (UFRN) Department of Restorative Dentistry São Paulo State University (UNESP)
Databáze: OpenAIRE
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