Effect of microwave disinfection on physical and mechanical properties of acrylic resins


Autoria(s): Consani, Rafael Leonardo Xediek; Vieira, Erica Brenoe; Mesquita, Marcelo Ferraz; Mendes, Wilson Batista; Arioli-Filho, João Neudenir
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

27/05/2014

27/05/2014

01/12/2008

Resumo

This study evaluated the effect of microwave energy on the hardness, impact strength and flexural strength of the Clássico, Onda-Cryl and QC-20 acrylic resins. Aluminum die were embedded in metallic or plastic flasks with type III dental stone, in accordance with the traditional packing technique. A mixing powder/liquid ratio was used according to the manufacturer's instructions. After polymerization in water batch at 74°C for 9 h, boiling water for 20 min or microwave energy at 900 W for 10 min, the specimens were deflasked after flask cooling at room temperature, and submitted to finishing. Specimens non-disinfected and disinfected by microwave irradiation were submitted to hardness, impact and flexural strength tests. Each specimen was immersed in distilled water and disinfected in a microwave oven calibrated to 650 W for 3 min. Knoop hardness test was performed with 25 g load for 10 s, impact test was carried out using the Charpy system with 40 kpcm, and 3-point bending test with a crosshead speed of 0.5 mm/min until fracture. Data were submitted to statistical analysis by ANOVA and Tukey's test (α=0.05). Disinfection by microwave energy decreased the hardness of Clássico and Onda-Cryl acrylic resins, but no effect was observed on the impact and flexural strength of all tested resins.

Formato

348-353

Identificador

http://dx.doi.org/10.1590/S0103-64402008000400011

Brazilian Dental Journal, v. 19, n. 4, p. 348-353, 2008.

0103-6440

1806-4760

http://hdl.handle.net/11449/70713

10.1590/S0103-64402008000400011

S0103-64402008000400011

2-s2.0-63249129569

2-s2.0-63249129569.pdf

Idioma(s)

eng

Relação

Brazilian Dental Journal

Direitos

openAccess

Palavras-Chave #Acrylic resin #Flexural strength #Hardness #Impact #Microwave disinfection #acrylic acid resin #dental care #disinfection #equipment #hardness #materials testing #methodology #microwave radiation #pliability #radiation exposure #Acrylic Resins #Dental Stress Analysis #Disinfection #Equipment Contamination #Materials Testing #Microwaves #Pliability
Tipo

info:eu-repo/semantics/article