Avaliação in vitro da resistência à abrasão de diferentes dentes artificiais de resina armazenados em saliva artificial
In vitro abrasion resistance evaluation of different artificial resin teeth storaged in artificial saliva
Assunção, W.G.; Tabata, L.; Nicolau, E.I.; Shiwa, M.; Santos, P.H.
Rev. odontol. UNESP, vol.35, n4, p.285-291, 2006
Resumo
Foi propósito deste estudo avaliar a resistência à abrasão de dentes artificiais de resina de 7 diferentes marcas comerciais, previamente submetidos a hidratação em saliva artificial. Foram utilizados primeiros molares inferiores das marcas Artplus, Biolux, Myerson, SR Orthosit, Trilux, Trubyte Biotone e Vipi Dent Plus, divididos em 7 grupos (n = 12), totalizando 84 corpos‑de-prova. Após serem confeccionados em embutidora metalográfica sob pressão de 150 kgf.cm-2, durante 16 minutos, os corpos-de-prova permaneceram imersos em saliva artificial à temperatura constante de 37 ± 1 °C durante 30 dias. Em seguida foram submetidos ao ensaio de desgaste em politriz metalográfica, sob pressão de 200 gramas e velocidade constante, durante 10 minutos. A resistência foi avaliada pelo método gravimétrico em balança de precisão, segundo as diferenças porcentuais das massas de cada corpo-de-prova antes e após o ensaio. Os valores obtidos foram submetidos à análise de variância e posteriormente ao teste comparativo de Tukey (p < 0,05). Observou-se diferença estatisticamente significante entre o grupo SR Orthosit e os demais grupos, que não apresentaram diferença significante entre si. Ante as condições testadas, as marcas Artplus, Biolux, Myerson, Trilux, Trubyte Biotone e Vipi Dent Plus apresentaram comportamento semelhante, demonstrando menor resistência à abrasão quando comparadas ao grupo SR Orthosit, que apresentou maior resistência.
Palavras-chave
Dentes artificiais, desgaste, resistência à abrasão
Abstract
The purpose of this paper was to evaluate the abrasion resistance of 7 different commercial brands of artificial resin teeth, storage previously into artificial saliva. The 1st inferior molar used from brands Artplus, Biolux, Myerson, SR Orthosit, Trilux, Trubyte Biotone and Vipi Dent Plus, were separated in 7 groups (n = 12), totalizing 84 samples. After been made in a metalographic in-built device under pression of 150 kgf.cm-² during 16 minutes, the samples were storage into artificial saliva under constant temperature of 37 ± 1 °C during 30 days. After this period the samples were submmited to wear resistance tests, performed in a metallographic polishing device under 200 gr pression and constant velocity, during 10 minutes. The resistance was evaluated through gravimetric method in an electronic precision balance, according to the percentual difference of weight of each sample before and after the wear resistance test. The obtained data were analyzed by ANOVA, followed by comparative Tukey test (p < 0.05). Statistically significant difference was observed between group SR Orthosit and the others groups, that did not presented statistical difference among them. Within the tested condition, the brands Artplus, Biolux, Myerson, Trilux, Trubyte Biotone and Vipi Dent Plus presented similar performance, demonstrating lower abrasion resistance, when compared to group SR Orthosit, that presented greater resistance.
Keywords
Artificial teeth, wear, abrasion resistance
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