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- Title
Resistência à flexão e microdureza da resina acrílica quimicamente ativada submetida à tratamento por energia de micro-ondas.
- Authors
SILVA, Lucas Hian da; TANGO, Rubens Nisie; KIMPARA, Estevão Tomomitsu; SAAVEDRA, Guilherme de Siqueira Ferreira Anzaloni; PAES JUNIOR, Tarcisio José de Arruda
- Abstract
Objective This study assessed the effectiveness of microwave energy treatment on the flexural resistance and microhardness of the chemically-activated acrylic resin Dencrilay Speed®. Methods Twenty-four specimens were prepared and divided into 4 groups according to microwave-energy treatment cycle. G1 (control) did not receive any treatment. The specimens in groups G2, G3 and G4 were immersed in 200mL of distilled water and then microwaved in a 650W oven for 5, 3 and 1 minutes, respectively. Each group (n=6) was submitted to a three-point flexural strength test and to a Vickers hardness test after a 48-hour storage. Results The mean values (MPa) and standard deviations for the flexural strength test were: G1 86.04 ± 10.32 a; G2 100.1 ± 5.52 ab; G3 102, 04 ± 5.41 b; G4 104.81 ± 14.17b. The mean values found for the hardness test (VHN) were: G1-21.98 ± 0.82 a; G2-20.15 ± 1.24 b; G3- 19,69 ± 0.91 b; G4-19.44 ± 0.41 b. Conclusion Microwave treatment increased the flexural strength and reduced the microhardness of chemically-activated acrylic resins.
- Subjects
MICROWAVES; MICROHARDNESS; ACRYLIC resins; STRENGTH of materials; HARDNESS testing; COMPLETE dentures
- Publication
RGO: Revista Gaúcha de Odontologia, 2011, Vol 59, Issue 2, p237
- ISSN
0103-6971
- Publication type
Article