Survival of cylindrical implants in composite grafted maxillary sinuses

Purpose: This retrospective study investigated the survival of dental impla nts placed in the maxilla after composite grafting of the sinus and an aver age of 55 months of loading. Patients and Methods: Maxillary sinuses of 88 patients were grafted with au togenous cancellous bone combined with dense hydroxyapatite particles. Afte r an average healing period of 3.4 months, hydroxyapatite-coated titanium e ndosseous implants were placed. A total of 388 implants were placed in graf ted sinus floors, and 82 were placed in onlay grafted nonsinus position in the canine region. The implants were loaded with overdentures and fixed bri dges 4 months (mean) after implantation, with a follow-up for a mean of 55 months. Results: The cumulative implant survival was calculated according to the Ka plan-Meier method. Implant survival from the time of loading was 89% in ful l reconstructed cases and 90% in partially edentulous cases. The overall cu mulative implant survival rate, including the loss in the surgical stage, w as 82%. Conclusion: Implant loss in composite grafted maxillae after 70 months of f ollow-up was similar to loss in nongrafted maxillae.