Estudo comparativo in vitro entre diferentes materiais e métodos de união de transferentes de moldagem em implantodontia

Abstract

This in vitro study examined by a comparative way impression splinting two materials and three methods for transfer copings in prothesis over implants in order to optimize this phase of impression and get better final adaptation. Performed to a metal base containing two hexagon external implants and gave a metal base welded by laser. To make the impression, was made 15 individually trays that were prepared in standard acrylic resin. The groups were divided in 6, each group was composed of 5 samples. Group A - transfer copings splinted with dental floss and acrylic resin (Duralay); Group B - transfer copings splinted with pre-polymerized acrylic resin (Duralay) bars; Group C - transfer copings splinted with dental floss, acrylic resin (Duralay), sectioned after setting and welded; Group D - transfer copings splinted with dental floss and bis-acrylic resin (Structur 2 SC); Group E - transfer copings splinted with pre-polymerized bis-acrylic resin (Structur 2SC) bars; Group F - transfer copings splinted with dental floss, bis-acrylic resin (Structur 2SC), sectioned after setting and welded. The impression material used for all groups was the addition silicone Adsil and the casting of the models used the special plaster type IV. To measure the dimensional changes of the vertical metal bar was bolted in the matrix and in each of the samples, with manual torque wrenches under torque of 20 Ncm. The values were obtained with the aid of program capture digital images Axio Vision Rel 4.8 and AxioCam digital camera coupled to optical Discovery V20 microscope (Zeiss) with 100X. The distance between the outer surface of the implant analog and the lower edge of the metal bar (gap) was measured at middle region of the image into focus. In order to identify differences between resins and methods we used Analysis of Variance two-way (ANOVA). There was no difference between the resins (p = 0.87) and no difference between the methods (p = 0.577). Group F showed the lowest average total gap. When observing the interactions between resins and splint methods, the Test "t" Student identified that the difference was statistically significant between Groups B and E (p = 0.059) and the Group B had a better result. Was considered significant if p ≤ 0.05.