Clinical Assessment Of Inlay Retained Bridge Designs (Tub Shaped And Inlay Shaped) In Missing Posterior Teeth Cases. (Randomized Controlled Trial)

Abstract

Objective: The aim of this study was to compare two inlay retained bridge designs (tub shaped and inlay shaped) used to replace missing posterior tooth cases regarding fracture resistance, bone loss, and retention. 

Materials and Methods: thirty inlay retained bridge were done for restoring missing posterior tooth. Scalling and polishing were done for all patients two weeks before preparation. The patients were classified into two groups according to the preparation designs. Group 1: (tub shaped design) and Group 2: (inlay shaped design). PMMA resin was used for try in stage, and monolithic zirconia (Katana, Kurary) was used for the final restorations. The try in, temporary restoration and the final restorations were done using CAD/CAM (DWX-50) machine with software (Exocad). The restoration surfaces were treated using sandblasting and Z-prime S (Bisco) and the cementation was done by using self-adhesive resin cement (Bisco). Frature resistance and retention were evaluated immediately after cementation using the Modified United States Public Health Service for restoration clinical assessments (MUSPHS standards). These measurements were repeated after one, three, six, nine, and twelve months respectively. Bone loss was also assessed by using x-ray.

Results: It was found that there was no significant difference between the two studied groups regarding different studied variables.

Conclusion: Within limitations of this study, the following conclusion could be drawn as follows: Up to one year clinical observation period, inlay retained fixed dental prostheses made from monolithic zirconia with two designs (inlay shaped and tub-shaped) revealed successful clinical performance in terms of fracture resistance, retention and bone loss.