الفهرس 
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Abstract
Aim: Evaluate the clinical performance of two inlay-retained bridge designs (proximal shaped and inlay shaped) in single missing posterior teeth cases.
Methodology: Seventy inlay retained bridges were fabricated for posterior teeth. Scaling and polishing were performed for all the patients two weeks before preparation.The patients were divided into two groups according to the preparation designs. Group1:(the inlay shaped design) and Group2:(the proximal box design).PMMAresin(YAMAHACHI PMMA) was used for the try in stage and monolithic zirconia ( Katana, Kuraray)was used for the final restorations.The try-in and the final restorations were performed 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). Fracture, marginal adaptation, postoperative sensitivity, caries, and gingivitis were assessed 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.
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Results: Chi-square test and Fisher’s Exact test was used to compare between the two groups. Fracture, marginal adaptation, postoperative sensitivity, caries, and gingivitis were evaluated according to the criteria of MUSPHS and we found there was no significant difference between the two groups. Kaplan-Meier survival curve was constructed to calculate the mean survival estimates of the two groups and we found that the two groups were clinically successful during one year follow up.
Conclusions: Both designs of inlay retained fixed dental prostheses revealed successful clinical performance in terms of fracture, marginal adaptation, postoperative sensitivity, caries, and gingivitis.