SINUS INLAY BONE AUGMENTATION - COMPARISON OF IMPLANT POSITIONING AFTER ONE-STAGED OR 2-STAGED PROCEDURES

Purpose: This study was undertaken to compare implant angulation and p osition after one- or two-stage sinus inlay bone augmentation. Patient s and Methods: Twenty patients were retrospectively selected; group 1 (n = 10) was operated on with a one-stage procedure, and group 2 (n = 10) with a two-stage operation. Casts processed for the final permanen t or temporary bridgework were collected and photographed from an obli que anterior view paralleling the alveolar crest on the right and left sides, as well as from an occlusal view. The angle between impression pins inserted in the abutments relative to the true vertical was reco rded. In the occlusal view, the midpoints of the abutments were relate d to an individual computerized superimposed parabola. Results: The im plants inserted during the one-stage procedure were generally placed m ore palatally (Wilcoxon rank sum test, P = .0101) and angled more pala tally (P = .0009) compared with those placed with the two-stage operat ion. Conclusion: This study showed that the two methods of treating pa tients by sinus inlay bone augmentation differed significantly with re gard to placement and angulation of the implants. A two-stage procedur e seems to offer the surgeon more optimal conditions for positioning t he implants.