Estudo comparativo entre dois métodos de aplicação de torque aos pilares protéticos em implantes de conexão externa

The purpose of this study was to evaluate the effect of the retorquing on the preload of Ceraone abutment fixed to implants of external connection after different elapsed times for data collection. Thirty external hexagon implants (ConexaoTM, Brazil) were embedded in acrylic resin. After, the CeraoneTM abutments were fixed on each implant and the torque was applied (30 Ncm). The sets of implant/abutment/screw were divided among six groups according to the factors “retorquing” and “elapsed times for data collection” (2, 5 and 10 min) (n = 5): torque application + detorque data collection after 2min (GA1), 5min (GA2) and 10min (GA3) and torque application + new torque application (retorquing) after 10min + detorque data collection after 2min (GB1), 5min (GB2) and 10min (GB3). The data obtained were statistically analyzed by using the ANOVA two-way and Tukey test (5%). The means (± DP) of the detorque values (Ncm) observed for the experimental conditions were: GA1: 25.39 ± 1.59; GA2: 22.91 ± 1.74; GA3: 21.95 ± 1.07; GB1: 28.16 ± 2.92; GB2: 21.97 ± 1.44; GB3: 21.21 ± 2.91. It was observed that the methods for torque application (retorquing) did not influence the lost of preload for the groups studied (p = 0.6427 > 0.05) and that the elapsed time for retorquing data collection significantly affected the preload values, where the higher values were obtained after 2 min (p = 0.0001 < 0.05) torque application. We concluded that regardless the methods used for torque application, there was a significant loss of preload after 5min torque application.