Abstract
Background: Assess changes in apical bone height / bone gain for up to 8 years after implant placement combined with simultaneous elevation of the internal sinus from the sinus floor (ISFE) without the use of a graft.
Methods: 217 implants were placed in combination with ISFE without graft and successfully integrated into the posterior maxilla of 138 patients. Radiographs after surgery over an evaluation period of up to 8 years were analyzed. Changes in the apical and marginal bone height related to the implants were measured. Differences in bone height over the study period were assessed using the Wilcoxon test. To identify possible factors influencing apical bone gain and marginal bone loss, regressive linear regression selections and mixed linear regression models were performed.
Results: In the apical aspects of the implants, significant mean vertical bone gain of 2.4 mm (mesial) and 2.6 mm (distal) was observed after 6 months (p <0.05). Radiographic analysis produced an additional bone gain of up to approximately 3.5 mm during the study period. The small initial bone height was crossed with a more pronounced apical bone gain (p <0.05).
Conclusions: If the implants are placed in combination with the ISFE without a graft, a significant vertical bone gain can be expected, especially in the first postoperative year. Lower initial bone height is associated with a greater probability of greater bone gain.
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