Özet:

Objective: This study aimed to measure the lateral wall thickness (LWT) and width of the maxillary sinus using cone-beam computed tomography (CBCT) to prevent intra- and post-operative complications by formulating a new sinus classification. Materials and Methods: Residual ridge height, maxillary sinus width (SW) and lateral wall thickness (LWT) were measured by analysing CBCT scans from 246 edentulous sites. The SW and LWT were measured at 3 mm and 5 mm, respectively, from the sinus floor. The mean SW was stratified by the residual ridge height (<4; ≤4 and <7; ≤7 and <10; ≥10 mm), study site and measurement level. Results: The mean SW increased at molar sites and at sites with lower residual ridge heights. Sinuses were categorised based on the 33rd and 67th percentile SW values at 3 mm and 5 mm, respectively. The mean value at the lower boundary was 9.33 (1.85) mm, with the 33rd and 67th percentiles being 8.62 and 10.11 mm, and the mean value at the upper boundary was 11.72 (2.20) mm, with the same percentiles being 10.81 and 12.59 mm, respectively. The mean LWTs at 3 and 5 mm were 1.67 and 1.56 mm, respectively. Conclusion: The proposed SW classification and LWT may help predict the difficulty of sinus elevation when selecting appropriate surgical approaches.

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