Evaluation of the accuracy between splinting and non-splintingimpression techniques for multiple implants

Abstract

Introduction: Among the determinant factors for the implant-supported prosthesis longevity is the exact and comprehensive process of impression which results is the passive prosthesis fitting. Objective: To compare the accuracy of transfer coping impression techniques with or without splinting, after the isolation of the factors associated to the passive fitting. Method: Based on the control group composed by an edentulous mandibular master model (self-cured acrylic resin) with four external hexagon parallel implants splinting with a metallic bar, four customized open trays were constructed with self-cured acrylic. Ten impressions were made with condensation silicone ( Xantopren ®), poured with type IV plaster ( Durone ®), and then divided into two groups: Group 1 (n=5) ­ non-splinting multi unit transfer copings; and Group 2 (n=5) ­ splinting multi unit transfer copings with a bar constructed with self-cured acrylic resin ( Palavit G ®) and dental floss, with the aid of an addition silicon mold ( Elite Double ® Zhermack) . Next, the bar was cut and splinted again. The ten transfer molds were measured at the center of the labial surface of each implant with the aid of Stereoscopic Magnifying Glass ( Physis ®) with x60 magnification. The results were tabulated and submitted to non-parametric statistics through Kruskal-Wallis test (p<0.05). Results: The means were: 22.44 µm (±7) for control group, 26.86 µm (±10) for direct splinting, and 24.70 µm (±13) for direct non-splinting technique. Conclusion: No statistically significant differences were found between the tested techniques.