Influence of casting pattern made from wax, Duraly™ resin and Pattern™ resin in marginal misfit of cast the commercially pure titanium crowns

Abstract

In metallic total crowns, the maximum of marginal fit to the dental element is required for the longevity of the restorations. The aim of this study was to evaluate the influence of casting pattern manufactured from wax, Duralay™ acrylic resin and Pattern™ acrylic resin in marginal fit of cast commercially pure titanium (CP Ti) crowns. By means of a mechanic lathe, ten bovine teeth were prepared to receive cast crowns. Dies in dental stone type V were originated from bovine teeth by vinyl polysiloxane impressions. Thirty titanium crowns were casted in three different group (n = 10). The groups had been divided by the material used in the production of casting patterns: wax, Duralay™ acrylic resin and Pattern ™ acrylic resin. Marginal misfit values (ìm) were recorded at four measurement point on each one casting with a traveling microscope (120X). By means of Analysis of Variance and Tukey test (p ≤ 0,05) were not exhibited significances statistical differences among mean values of marginal fit for the wax group (151,20 ± 47,40 ìm) and the others group: Duralay™ resin group (153,60 ± 37,10 ìm) and Pattern™ resin group (165,00 ± 32,50 ìm). It was concluded that the material used in the manufacture of casting pattern did not interfere in the marginal fit of cast titanium crowns. Key words: dental prosthesis, marginal fit, titanium.