Accuracy of splinted and non-splinted impression techniques for angulated implants in an edentulous mandibular model

Objective: This in vitro study aimed to compare the accuracy of splinted versus non-splinted open-tray impression techniques for angulated implants in an edentulous mandibular model.Methods: In this in vitro study, three acrylic edentulous mandibular models were used, each containing three implants placed at angulations of ۰°, ۱۵°, and ۲۵°. Five impressions were obtained from each model using either splinted or non-splinted open-tray techniques (n=۵ per technique/angulation, total n=۳۰). The impressions were made using polyvinyl siloxane with either splinted or non-splinted copings. Reference scans obtained from a laboratory scanner served as the gold standard. Three-dimensional (۳D) deviations between test and reference datasets were measured using Geomagic Control X software, and the results were analyzed by two-way ANOVA at the significance level of P<۰.۰۵.Results: The mean ۳D deviations were ۵۷.۹۰ ± ۱۲.۶۵ µm for non-splinted impressions and ۶۱.۸۴ ± ۱۵.۸۴ µm for splinted impressions. The mean deviation was lowest at ۱۵° (۵۶.۳۸ ± ۱۴.۸۳ µm) and highest at ۲۵° (۶۴.۴۴ ± ۱۴.۶۲ µm).No significant difference was observed in the accuracy of different impression techniques (P=۰.۵۳۵). Furthermore, implant angulation did not significantly affect impression accuracy (P=۰.۴۰۱).Conclusions: Within the limitations of this study, the splinted open-tray technique demonstrated comparable accuracy to the non-splinted technique. Implant angulation up to ۲۵° did not significantly affect the precision of splinted and non-splinted open-tray impressions.

کلیدواژه ها:

Dental implants ، Dental Impression Technique ، dental prosthesis ، Implant-supported dental prostheses ، Splints