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Long-term outcome of implants placed with guided bone regeneration (GBR) using resorbable and non-resorbable membranes after 12–14 years
Ronald E. Jung, Nadine Fenner, Christoph H. F. Hämmerle and Nicola U. Zitzmann
Clinical Oral Implants Research, Volume 24, Issue 10, pages 1065–1073, October 2013
Aim
The aim of the present prospective study was to evaluate the long-term outcome of implants placed simultaneously with guided bone regeneration (GBR) using resorbable and non-resorbable membranes.
Materials and methods
The original study population consisted of 72 patients receiving a total of 265 implants. In all GBR-treated sites, demineralized bovine bone mineral (DBBM) was used in combination either with a collagen (CM) or an Expanded polytetrafluoroethylene (e-PTFE) membrane. A total of 112 implants was treated with CM, 41 implants were treated with e-PTFE membranes, and 112 served as a control group because implants were entirely surrounded by bone and did not need any GBR procedures. Clinical and radiographic analyses were performed after a period of 12–14 years.
Results
The median follow-up time was 12.5 years (range 12–14 years). A total of 58 patients participated in the present investigation, corresponding to 80.5% of the original study population. The cumulative implant survival rate at the follow-up examination was 93.2%. For the control group the cumulative survival rate was 94.6%, for the CM 91.9%, and for the e-PTFE 92.6%. Differences among the groups were not statistically significant.
The radiographically determined marginal bone level (MBL) amounted to: control 2.36 mm (SD), CM 2.4 mm (SD), e-PTFE 2.53 mm (SD). There is no evidence (P < 0.2) that the slope of bone level over time is different for the three treatment groups.
Conclusion
It is concluded that implants placed simultaneously with GBR procedures using resorbable or non-resorbable membranes reveal a high survival rate ranging from 91.9% to 92.6%, therefore it is considered to be a safe and predictable therapy. [Correction added after online publication 30 November 2012: the marginal bone level of CM, e-PTFE, and control was corrected to ‘control 2.36 mm (SD), CM 2.4 mm (SD), e-PTFE 2.53 mm (SD)’ in the Results section]
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