Comparison of Peri-Implant Bone Loss and Survival of Maxillary Intrasinus and Extrasinus Implants After 2 Years

Low quality of the bone and insufficient bone due to the size of the sinus andresorption of the alveolar ridge decrease the long-term survival of implants in the posteriormaxilla compared to other regions of the jaws. Surgical procedures to increase bone volumemake it possible to place implants longer than 8 mm. In this situation sinus elevationmakes it possible to place implants. We intend to evaluate peri-implant bone loss and survivalof implants placed in elevated sinuses after 2 years and to compare with implantsplaced in the native posterior maxilla.Materials and Methods:Twenty-five implants placed in sinuses that had been reconstructedwith Bio-Oss and healed after 9 months were compared with 30 implants placedin the posterior maxilla without any surgery. The groups were compared using probingpocket depth, bleeding on probing, Plaque Index and bone loss immediately after implantplacement surgery and 2 years postoperatively. The criterion for implant survival waspresence or absence of the implant in the oral cavity, which was recorded in relevantforms in both groups.Results: Three implants were lost; one in control and two in grafted sinuses. No significantdifferences were observed in the survival rates. In general, the mean bone loss aroundintrasinus and extrasinus implants was not significantly different. In the same context, nodifferences were observed between bleeding on probing, Plaque Index and probing pocketdepths of two groups (P=0.397, P=0.637 and P=0.224, respectively).Conclusion: The survival and bone loss around intrasinus and extrasinus implants aresimilar.