Avaliação in vitro da dureza superficial de uma resina acrilica para microondas e rugosidade da mesma e de duas ligas metalicas quando submetidas a agentes quimicos de limpeza

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

The aim of this study was to evaluate the Knoop hardness and roughness of microwave acrylic resin and the roughness of two metal alloys: Co-Cr and Ti-6Al-4V when immersed into two denture cleansers. Forty-eight samples of Onda-Cryl acrylic resin were made with a metallic bar exposed in one side. Eight samples with Co-Cr alloy were immersed in denture cleanser Polident (G 1 ), eight in denture cleanser made in Manipulation pharmacy (G2), and eight in water (Control) (G3); the same procedure was repeated with Ti-6Al-4V samples (G4, G5 and G6, respectively). All samples were kept in synthetic saliva at 37°C and immersed in the soIutions during 5 minutes, 3 times a day. The Knoop hardness and roughness were verified immediately after polishing (TO), and after 1 (TI), 15 (T2), 30 (T3) days. The Knoop hardness was evaluated using microhardness Shimadzu IIl V-200 and the roughness in roughmeter Surfcorder SE 1700. The results were submitted to a statistic analysis and showed that: a) Knoop hardness was significantly different for groups Gl and G4 during TI and T3 (14.028::t2.784; 14.056::t1.761) and for the groups G2 and G5 during T2 (16.992i:2.243); b) roughness of acrylic resin was different for groups Gl and G4 during T2 and T3 (O. 144::t0.062; 0.209::t0.383); c) roughness of Co-Cr alloy, showed differences for group G2 (0.104i:0.035) during TI; and group Gl (0.148:!0.016) was different on times T2 and for T3 time all the groups were differents; and d) roughness of Ti-6Al-4Valloy, showed that the group G4 was different for T2 (0.119:!0.005) and T3 (0.108:!0.037). Regarding to alloys, the group G3 (0.083:!0.018) were different during TO, G6 (2.354:!0.767) and T3. It can be concluded that the denture cleanser Polident reduced the acrylic resin hardness and do not interfere in the roughness of acrylic resin and alloys studied. The Manipulation denture cleanser increased the roughness af acrylic resin and alloys

ASSUNTO(S)

limpeza resistencia dos materiais cobalto resinas acrilicas protese dentaria titanio

ACESSO AO ARTIGO

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