Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/33667
Type: Artigo de periódico
Title: Effect of cement types on the tensile strength of metallic crowns submitted to thermocycling
Author: Consani, Simonides
Santos, Julie Guzela dos
Correr Sobrinho, Lourenço
Sinhoreti, Mário Alexandre Coelho
Sousa-Neto, Manoel Damião
Abstract: The relationship between metallic cast crowns and tensile strength according to cement types submitted to thermocycling was studied. Seventy-two metallic crowns were cast with Verabond II Ni-Cr alloy and cemented in standardized preparations with 10º tapering. Three types of finishing line (45-degree chamfered, 20-degree bevel shoulder and right shoulder) were made with diamond burs on bovine teeth. Twenty-four metallic crowns in each group were randomly subdivided into three subgroups of 8 samples each according to the cement used: SS White zinc phosphate cement, Vitremer resin-modified glass ionomer cement, and Rely X resin cement and were submitted to thermocycling. Retention was evaluated according to tensile load required to displace the metallic cast crowns from tooth preparations with an Instron testing machine. ANOVA and Tukey's test showed a statistically significant difference among luting materials, with greater results for Rely X resin cement (24.9 kgf) followed by SS White zinc phosphate cement (13.3 kgf) and Vitremer resin-modified glass ionomer cement (10.1 kgf). The finishing line types did not influence the tensile resistance of the crowns fixed with the three cements. Increased tensile resistance of metallic crowns fixed on bovine teeth was obtained with resin cement, independent of the finishing line types.
O objetivo deste estudo foi verificar a resistência à tração de coroas metálicas fixadas com diferentes cimentos e submetidas à termociclagem. Setenta e duas coroas foram fundidas com liga de Ni-Cr Verabond II e cimentadas em preparos padronizados com 8º de paredes laterais e acabamento cervical com ombro reto, ombro biseldo 20º e ombro chanfrado 45º. As coroas foram separadas em três grupos de oito elementos de acordo com os cimentos: fosfato de zinco (SS White), ionômero de vidro modificado por resina Vitremer (3M ) e resinoso Rely X (3M), e submetidas a 500 ciclos térmicos em banhos de 5ºC e 55ºC. A retenção foi avaliada de acordo com a carga de tração (kgf) necessária para separar a coroa do preparo, numa máquina Instron com velocidade de 0,5 mm/minuto. Os resultados submetidos à análise de variância e ao teste de Tukey (5%) mostraram que a retenção mais eficiente foi obtida com o cimento resinoso, independentemente do tipo de acabamento cervical.
Subject: metallic crown
cervical finishing line
cement type
Editor: Fundação Odontológica de Ribeirão Preto
Rights: aberto
Identifier DOI: 10.1590/S0103-64402003000300010
Address: http://dx.doi.org/10.1590/S0103-64402003000300010
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-64402003000300010
Date Issue: 1-Jan-2003
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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