Resistência de união imediata por tração de diferentes cimentos de ionômero de vidro a uma liga de Ni-Cr
Abstract
O objetivo deste estudo foi avaliar a resistência de união imediata por tração de diferentes cimentos de ionômero de vidro: convencional (Vidrion C, Vidrion C Caps, Ketac Cem), resinomodificado (Rely X, Protec Cem) e o cimento de Fosfato de Zinco a uma liga de NiCr. Foram confeccionados pares de dispositivos metálicos em NiCr, com superfícies planas, próprios para a cimentação e testes de tração. Foram cimentados 12 pares metálicos de NiCr para cada agente cimentante, preparados de acordo com as recomendações do fabricante, totalizando 72 corpos de prova. Para manter os corpos de prova em posição e com carga constante durante a cimentação utilizou-se uma mesa metálica. Os corpos de prova foram armazenados em água destilada a 37° C durante 1 hora e, em seguida, submetidos aos testes de tração. Os resultados obtidos foram submetidos a ANOVA e Teste de Tukey (p < 0.05). As médias de resistência, em MPa, encontradas foram: Vidrion C = 8,86; Vidrion C Caps = 10,91; Ketac Cem = 11,48; Rely X = 9,48; Protec Cem = 10,06; Fosfato de Zinco = 2,69. Todos os cimentos de ionômero de vidro testados apresentaram a média de resistência de união imediata por tração maior e estatisticamente significante que o cimento de Fosfato de Zinco. Não houve diferença significativa entre as médias de resistência obtidas para o Ketac-Cem, Vidrion C Caps, Protec Cem e Rely X, porém, o Ketac-Cem apresentou média estatisticamente significante e superior ao Vidrion C.
UNITERMOS: cimentos dentários; cimentos de ionômeros de vidro; cimentos de fosfato de zinco; resistência à tração.
SUMMARY
The aim of this study was to evaluate the immediate tensile bond strength of different luting agents: conventional glass ionomer (Vidrion C, Vidrion C Caps, Ketac Cem); resin modified glass ionomer (Rely X, Protec Cem) and zinc phosphate cement to a NiCr alloy. Pairs of metal devices were prepared NiCr alloy, with a flat surface, suitable for cementation and tensile test. Twelve pairs of NiCr metal were cemented with each agent cement and prepared following the manufacturer´s recommendations, totalized seventy pairs of the specimens. During the cimentation a metal table was utilized to keep up the specimens in position and to standardize the pressure. Specimens were stored in destilled water at 37° C for 1 hour and then loaded in tensile tests. Data were analysed by 1 way -ANOVA and Tukey’s test (p < 0,05). The mean bond strengths, in MPa: Vidrion C = 8.86; Vidrion C Caps = 10,91; Ketac Cem = 11,48; Rely X = 9,48; Protec Cem = 10,06; Fosfato de Zinco = 2,69. All luting agents showed an immediate tensile bond strength significantly higher than zinc phosphate cement. There were not significant difference between the mean bond strengths: Ketac Cem, Vidrion C Caps, Protec Cem e Rely X, however, Ketac Cem presented a mean bond strength significantly higher than Vidrion C.
UNITERMS: luting cements; glass ionomer cements; zinc phosphate cements; tensile bond strength.
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