Effect of ridge preservation at molar extraction sites with severe periodontitis on the Schneiderian membrane thickness changes: a pilot study

摘要

Schematic overview of the nine measurement points in the evaluated maxillary sinuses of a representative upper first molar before tooth extraction. A1, M1 and P1 for the measurement of MT at coronal slices in mesial region (the anterior wall, the sinus floor, the posterior wall). A2, M2 and P2 at coronal slices in central region. A3, M3 and P3 at coronal slices in distal region