The purpose of this retrospective study was to evaluate the long term success of implants placed in augmented sites by alveolar distraction osteogenesis, and to prove if there is a significant difference in success between the data of this study and others which are linked to other augmenting procedures.
In a consecutive series, 36 patients with alveolar ridge deficiencies of the edentulous and partially edentulous mandible as well as partially edentulous maxilla were treated with 43 distraction devices in the time between 2000 and 2007. A hundred-five Implants could be placed at the time of distractor removal. From these 36 patients 23 could be examined with a total of 70 implants. Subsequently a statistical analysis was executed including the in situ survival rate, the Kaplan-Meier survival analysis and the success criteria.
The average observation time of all included implants was 6,1 years.
With only 2 losses, the in situ survival rate was 97,1%, Kaplan-Meier survival analysis revealed that the probability of survival after 6 years was 96,2%. Application of success criteria gave the following results: NIH 86%, Albrektsson 88%, Buser 94%, Jahn-dHoedt 89%.
The comparison of the clinical evaluated data between other studies showed no significant difference. The conclusion is that alveolar distraction osteogenesis produces similar results in the long term survival and quality assurance of the inserted implants.