Thermocycling effect on microhardness of laboratory composite resins


Autoria(s): Pereira, Sarina Maciel Braga; Castilho, Anderson Almeida; Salazar-Marocho, Susana María; Oliveira, Karla Mychellyne Costa; Váquez, Vanessa Zulema Ccahuana; Bottino, Marco Antonio
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

27/05/2014

27/05/2014

01/07/2007

Resumo

Tha aim of this study was to evaluate the thermocycling effect on microhardness of laboratory composite resins, 30 disks were fabricated, 5mm of diameter and 2mm of width, using 3 laboratory resins: G1 (n=10) - RESILAB MASTER (Wilcos-Brasil), G2 (n=10) - Vita VMLC (VITA Zahnfabrik-Germany), and G3 (n=10) - Vita Zeta (VITA Zahnfabrik-Germany). Vickers microhardness (HV) of all specimens was evaluated using a microhardness tester FM-700 (Future Tech- 50 g/10s). The specimens were measured before and after the thermocycling (3,000 times and 12,000 times - 5°/55°C±1). The microhardness values before cycling were (mean±SD): G1: 55.50±4.6; G2: 35.54±2.5; G3: 27.97±1.6; after 3,000 thermocycles: G1: 55.54±3.9; G2: 29.92±2.73; G3:21.01±1.4 and after 12,000 cycles G1: 54.27±3.2; G2: 30.91±1.6; G3: 23.81±0.9. Variance analysis (ANOVA) and Tukey's test was accomplished (p<0.05), the highest microhardness values were observed in G1: G2 and G3 showed reduction of microhardness values. It was concluded that, after thermocycling, the tested laboratory composites resins are susceptible to the decrease of surface microhardness.

Formato

1372-1375

Identificador

http://www.bibliotecadigital.unicamp.br/document/?code=24151&print=y

Brazilian Journal of Oral Sciences, v. 6, n. 22, p. 1372-1375, 2007.

1677-3217

1677-3225

http://hdl.handle.net/11449/69774

2-s2.0-37249087910

2-s2.0-37249087910.pdf

Idioma(s)

eng

Relação

Brazilian Journal of Oral Sciences

Direitos

openAccess

Palavras-Chave #Composite resins #Microhardness #Thermocycling
Tipo

info:eu-repo/semantics/article