Long-term evaluation of osseointegrated implants in regenerated and nonregenerated bone

This investigation evaluated the predictability of dental implants subjecte d to bone regeneration procedures at the time of insertion. Fifty-two lest implants were inserted into sites with periimplant bone defects. A calcium carbonate allograft material with or without a fibrin-fibronectin sealing s ystem was used to fill the defects. Sixty control implants were inserted in to an adequate volume of nonaugmented bone. Each of the 29 study patients r eceived at least one test implant and one control implant. At the second-st age surgery, fill of the bone defect was assessed as complete or incomplete . The cumulative success rate was 91.7% (mean follow-up 55 mo) for the lest implants and 93.2% (mean follow-up 59 mo) for the control implants. Within the test group, implants with complete bone fill achieved 97.6% success ve rsus 59. 1% success for implants with incomplete bone fill. These prelimina ry results suggest that implants placed with simultaneous bone regeneration procedures achieve long-term predictability that is comparable to that of implants placed in an adequate volume of bone, provided that complete bone fill of the periimplant defect is achieved. Long-term studies with other au gmentation materials are needed to fully validate these findings.