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Published on: August 13, 2019
Long-Term Stability of Bone Graft After Implant Failure in Lateral Sinus Floor Elevation: A Retrospective Paired
Mengdie Fu1, Danji Zhu1, Luyao Song1
1Stomatology Hospital, School of Stomatology, Zhejiang University School of Medicine, Zhejiang Provincial Clinical Research Center for Oral Diseases, Zhejiang Key Laboratory of Oral Biomedical, Hangzhou, China.
Objectives:
This retrospective paired cohort study aimed to compare the three-dimensional volumetric shrinkage of endo-sinus bone graft between failed and surviving implants after one-stage lateral sinus floor elevation (LSFE), and to assess the feasibility of implant replacement without additional augmentation.
Materials And Methods:
Twenty failed implants were matched 1:1 with 20 surviving implants based on key clinical variables. Cone-beam computed tomography scans at five time points were analyzed to quantify graft volume and height changes. Surgical methods and clinical outcomes for implant replacement were also recorded. Paired t-test and repeated measures ANOVA were used to compare the radiographic outcomes.
Results:
The shrinkage rate of endo-sinus bone grafts was statistically comparable between failed and surviving implants (32.54% ± 20.68% vs. 21.93% ± 10.54% at 1-year follow-up, p > 0.05). Residual bone graft reached adequate height to support replaced implants. Most failed sites were successfully restored with direct implant replacement, and reinserted implants achieved a 90% survival rate over a mean follow-up of 45 months.
Conclusions:
The findings suggest that implant failure after LSFE does not necessarily correlate with accelerated resorption of bone graft, supporting the feasibility of direct implant replacement without further grafting.
