Immediate restoration of immediate implants with delayed functional loading: 5-year results of 2-piece “table-top” implant crowns (Project Mozart)

KU3HT ePOSTER CLINICAL RESEARCH – PROSTHETICS

Background:: Immediate prosthetic restoration of immediate implants is generally performed via the concept of immediate provisionalization, i.e. provisional crowns without occlusal contact that are replaced by the final crown after a healing period of several weeks. The new crown design investigated aims to obviate the production of a provisional crown and to perform adhesive cementation in a great distance to the peri-implant mucosa (thus avoiding the risk of cement-associated peri-implantitis).

Aim/Hypothesis: To investigate the effectiveness of a new implant crown design for immediate restoration of immediate (pre)molar implants, characterized by its 2-piece buildup.

Materials and Methods: A total of 10 patients were included and followed-up 5 years after completion of prosthetic restoration. Single-tooth implants of 4 mm diameter and 10-13 mm length (T3^® tapered implants with DCD and platform switch, Biomet 3i^™) were placed into the extraction sockets of maxillary or mandibular (pre)molars. Three days after immediate implant placement the base portion was screwed onto the implant (without the table-top on it, thus without occlusal contact). The table-top (occlusal portion) was fabricated at the same time, however, cemented onto the base only after a implant healing phase of 2-3 months after implant placement.

Results: All implants were successful after 5 years of functional loading. Mean marginal bone loss was 0.11 ± 0.5 mm and the median Pink Esthetic Score was 12. Average Patient satisfaction was 98% on visual analogue scale

Conclusions and Clinical Implications: It may be concluded that immediate restoration of immediate implants using 2-piece „table-top” crowns represents a highly successful concept for posterior single tooth implants similar to the Copy-Abutment approach for immediate anterior implants.

Keywords: implant crown, screw-retained, immediate implant