Avaliação dos tecidos peri-implantares e próteses sobre diferentes tipos de pilares: estudo clínico prospectivo randomizado

Abstract

This prospective randomized study aimed to evaluate clinically and radiologically, peri-implant tissues and comparing metal-ceramic prostheses on pillars and conventional titanium copings with ceramic prostheses on prefabricated pillars of zirconia with copings the same material, custom by CAD/CAM system. Sixty implants were installed in aesthetic regions, in 35 patients. The entire sample, only two implants were lost. The implanted sites were divided into two groups receiving metal-ceramic and ceramic crowns. The entire sample was follow by digital radiography at different times (immediately, after three and five months function). To evaluate the criteria adopted if specific parameters for assessing peri-implant tissues and their crowns according Buser, Weber and Lang (1990), Mombelli et al. (1987), Belser et al. (2009), Blanes et al. (2007) and the Likert Scale. The aesthetics of the tissues was best seen according to PES "total" for the three-month evaluation, and to ZrO2 6.96 (± 1.64) and to Ti 6.55 (± 1.99). Statistically significant difference was observed in the WES "total" between the crowns, and 8.36 (± 1.22) for ZrO2 and 6.96 (± 1.52) for the Ti. In prosthesis on pillars of ZrO2 was possible to observe constancy in all the pump variables of Blanes et al. (2007). Thus, we concluded that the monitoring of five-months revealed pleasing esthetic results and peri-implant tissues healthy. Pillars of ZrO2 provide sufficient stability to support single tooth implant prostheses for aesthetic regions, considered up to the 2nd premolar. Despite high survival rates of both groups, prostheses on prefabricated pillars of ZrO2 and copings CAD/CAM, the same material, showed better aesthetic results as pre-established parameters for assessment reproducible of soft tissue and her crown (PES/WES). Digital radiographs either by subtraction or by subjective visual analysis showed a stable bone crest around the implant platform.