Clinical Evaluation of Marginal Fit of Uncemented Cad-Cam Monolithic Zirconia Three-Unit Restorations in Anterior Areas, Using Scannable and Conventional Polyvinyl Siloxane Impression Materials Publisher Pubmed



Kalantari MH¹ ; Abbasi B² ; Giti R¹ ; Rastegar Z³ ; Tavanafar S⁴ ; Shahsavaripour S⁵ Show Affiliations
Source: BMC Oral Health Published:2023

Abstract

Background: The accuracy of impression techniques determines the marginal fit of fixed prostheses. Marginal accuracy plays a main role in the success and failure of treatments. This in-vivo study evaluated the marginal fit of anterior three-unit monolithic zirconia fixed partial dentures (FPDs) using conventional and scannable polyvinyl siloxane impression materials. Methods: Ten patients were selected to replace the lateral teeth with a three-unit monolithic zirconia bridge. For each patient, in the first group, an impression was made with a two-step putty-wash technique using scannable polyvinyl siloxane material (BONASCAN; DMP, Greece). In the identical session, as the second group, an impression of conventional putty-wash polyvinyl siloxane was taken (BONASIL A+ Putty; DMP, Greece). The marginal discrepancy was measured through the replicas, which were cut perpendicularly within the buccolingual and mesiodistal directions. An Independent t-test was employed for data analyses (P < 0.05). Results: The marginal discrepancy in a conventional method for central abutment in mid-buccal, mid-lingual, mid-mesial, and mid-distal was higher than in the scannable method but it was not significant (P > 0.05). Also, the marginal discrepancy for canine abutment in the conventional method was higher than in the scannable method, but it was not significant, either (P > 0.05). Conclusions: FPDs fabricated from both scannable and conventional impression materials were not superior to each other in marginal fit for both central and canine abutments by evaluation using the replica technique. © 2023, The Author(s).