Abstract
Objective: The objective of this study is to evaluate the clinical effect of two abutment materials with two different types of superstructure metal free restoration on the platform switched implant. Subjects and Methods: Twenty human patients with missing maxillary central incisor were selected for implant placement and divided randomly into two groups according to abutment type Titanium abutment and PEEK abutment( n= 10 in each) .Each group was subdivided into two subgroubs according to superstructure crown (PEEK and VITA ENAMIC crown, n=5) All groups were evaluated clinically through measuring implant stability, determining screw loosening and color stability at base line, 3, 6 and 12 months . Results: As regarding to implant stability , there was no significant difference between four groups Ti PEEK ,Ti VIT , PEEK PEEK and PEEK VIT group (73.40 ± 3.44,73.80 ± 2.17,76.0 ± 1.87,73.40 ± 2.30). There is no screw loosening of all tested group. PEEK VIT group show the highest color change between all groups but the change is not significant . Conclusion: PEEK abutment with PEEK crown gives better result but in general implant stability is comparable with other groups. There is no screw loosening occur in all group. Color stability was better when use titanium abutment however the difference between all group was non significant. VITA ENAMIC crown with PEEK abutment show the higher color change, however the difference is non significant.