Avaliação da retentividade em restaurações provisórias imediatas utilizando pinos metálicos ou de fibra de vidro

Abstract

Provisional restorations are showing increasing importance in rehabilitation treatment carrying the necessary functions to improve occlusal stability, pulp protection, masticatory function and aesthetics results. In many cases these restorations need to use temporary intraradicular retainers. Thus, the present study evaluates the use of fiberglass posts as provisional intraradicular retainers, in order to optimize the provisional stage of oral rehabilitation. Two mechanical tests, "push-out" and "traction" were carried out to check the retentivity between the rebasement acrylic resin and the posts. The samples were divided into three groups for each test. Groups I and II (control groups) were composed by the trademarks METALPIN Angelus® and provisional PIVOT JON®, respectively. Group III (test group) was represented by WhitepostDC-E # 1 fiberglass post FGM®. The results obtained after the mechanical tests showed that the fiberglass posts achieved similar performance to the control groups in the push-out test. In the traction test, a statistically significant difference was observed in relation to the pressure required for the displacement of the intraradicular retainer in relation to the conduit. It presented even less occurrence of failure in the acrylic resin of rebasing. The fiberglass posts demonstrated satisfactory performance. In spite of not having mechanical retentions in their macrogeometry, they obtained similar or even superior performance in relation to the metal posts. This study shows the use of fiberglass posts as a practicable alternative for temporary intraradicular retainers.