Journal of Dentistry of Tehran University of Medical Sciences 2011. 8(3):130-137.

Comparison of Peri-Implant Bone Loss and Survival of Maxillary Intrasinus and Extrasinus Implants After 2 Years
AR. Rokn, AAR. Rasouli Ghahroudi, S. Hemati, A. Soolari

Abstract


Objective: Low quality of the bone and insufficient bone due to the size of the sinus and
resorption of the alveolar ridge decrease the long-term survival of implants in the posterior
maxilla compared to other regions of the jaws. Surgical procedures to increase bone volume
make it possible to place implants longer than 8 mm. In this situation sinus elevation
makes it possible to place implants. We intend to evaluate peri-implant bone loss and survival
of implants placed in elevated sinuses after 2 years and to compare with implants
placed in the native posterior maxilla.
Materials and Methods:Twenty-five implants placed in sinuses that had been reconstructed
with Bio-Oss and healed after 9 months were compared with 30 implants placed
in the posterior maxilla without any surgery. The groups were compared using probing
pocket depth, bleeding on probing, Plaque Index and bone loss immediately after implant
placement surgery and 2 years postoperatively. The criterion for implant survival was
presence or absence of the implant in the oral cavity, which was recorded in relevant
forms in both groups.
Results: Three implants were lost; one in control and two in grafted sinuses. No significant
differences were observed in the survival rates. In general, the mean bone loss around
intrasinus and extrasinus implants was not significantly different. In the same context, no
differences were observed between bleeding on probing, Plaque Index and probing pocket
depths 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 are
similar.


Keywords


Bio-Oss, Alveolar Bone Loss, Dental implants, maxillary sinus, survival rate,

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