Longevidade da cimentação de pinos de fibra de vidro e de coroas metalocerâmicas

Abstract

The use of resin cements for the cementation of fixed unitary prostheses and fiber posts have been shown good resuts. But, the existence of many different materials with different properties on this area, like the self-adhesive resin cement or the dual resin cement associated with an adhesive system, results in the doubt: What is the better cementing strategy for the dentist on the clinical daily? Then, the aim of this study is realize two evaluations: (1) To recall a prospective, multicenter, randomized controlled trial with the purpose of evaluate the survival rate of fiberglass posts submitted to two different cementation strategies; (2) To monitor the survival of metal ceramic crowns cemented with self adhesive resin cement. For both studies the sample was 152 teeth, which will be recalled annually for clinical and radiography revaluation. In the first study the cementing strategies evaluated will be: RelyX U 100 / U200 (3M®, St Paul, MN, USA) and Single Bond + RelyX ARC (3M®, St Paul, MN, USA). The choice of which strategy to use for each tooth will be chosen through randomisation, stratified into anterior and posterior teeth. All cementation procedures will be performed by previously trained professionals. The primary outcome will be the post decementation. In the second study the longevity of metal-ceramic crowns cemented with self-adhesive cement (RelyXU100 / U200) will be evaluated using the crown's decimentation like primary outcome. For the statistical analysis of both studies will be used the Kaplan-Meier method and Cox regression, with 95% confidence interval. For the results of cementation strategy of the post, both groups were statistically similar in survival (P=0.3334) and in success (P=0.5161). Metal-ceramic crowns had more than 85% of survival after periods up to 100 months. We conclude that both strategies of posts cementation are efficient and that the self-adhesive resin cement could be indicated for cementation of metal-ceramic crowns.