Influence of Schneiderian membrane perforation during maxillary sinus floor augmentation with lateral approach on dental implant survival rates: a retrospective study in a university setting.

Objectives: The primary objective of this study was to compare implant survival rates (ISR) in patients undergoing maxillary sinus floor augmentation (MSFA) with lateral approach with and without membrane perforation. Secondary objectives were to establish the percentage of perforations in these procedures and to evaluate the influence of perforation size on ISR.

Materials and methods: This retrospective study included patients requiring MSFA with lateral approach. Cases were assigned to two groups according to the occurrence or not of perforation. The exact size of each perforation was registered. Descriptive statistics and associations between the groups were calculated.

Results: This study analyzed data from 90 MSFA in 72 patients. Membrane perforation occurred in 24.44%. A total of 170 implants were placed; 72.35% were placed under intact membranes and 27.65% on repaired membranes. The overall ISR in MSFA procedures with intact membranes was 98.37%, and 93.62% in perforated membranes. No statistically significant relationship between groups was observed although the odds of implant failure increased by 4.125 times when perforation occurred. In turn, no statistically significant relationship was observed between perforation size and ISR.

Conclusions: Implants inserted below repaired membranes had a lower ISR compared with implants inserted below intact membranes although the difference was not statistically significant. Moreover, no significant statistical correlation was observed between perforation size and ISR.

Clinical relevance: Membrane perforation does not have a significant influence on subsequent implant survival rates. Knowledge of the exact size of the membrane perforation is essential for deciding on the right treatment plan.