INFLUENCE OF CROWN HEIGHT SPACE IN CASES OF DETACHMENT OF THE IMPLANT SUPPORTED FIXED PARTIAL DENTURES: RETROSPECTIVE CLINICAL STUDY

Aim of the study: The purpose of the current study was to determine the influence of the crown height space on the loss of retention in different types of implant-supported Fixed Partial Dentures (FPD). Material and Methods: 116 patients being partially edentulous regarding maxilla and mandibula have been followed retrospectively and restored by means of fixed prostheses on 261 implants. The study covered a five-year follow-up. The following indicators have been traced: implantation area, type of prosthetic restorations (single crowns, splinted crowns, bridge implant - implant, bridge implant - natural tooth), the height of restorative space and detachment of prosthetic restorations. Results: The detachment of the prosthesis was found in 5.7% of all cases. This was most frequently seen in the mandibular molar area (73.33%) when single crown restorations were used. The incidence of loss of retention increased when the crown height space was less than 8.0 mm. The conducted tests showed that these indicators affect with statistical significance. Conclusion: The results of the current study give us grounds for assuming that the reduced crown height space, the places of implantation and the type of restorations are important prerequisites for the occurrence of prosthetic restorations detachment.