The Effect of Pterygomasseteric Sling’s Area in the Postoperative Stability after Mandibular Setback Surgery

Figure 1

Landmarks: sella (S), nasion (N), menton (Me), antegonial notch (Ag), sigmoid notch (Sm), orbitale (Or), and porion (Po). -axis (green line): constructed by drawing a line through nasion 7° up from SN line. -axis (green line): a line through sella (S) perpendicular to the -axis. FH (Frankfort horizontal) line (brown color): a line connecting Po to Or. PMS (pterygomasseteric sling) line (brown color): a line through Ag point 65° to FH line. Area of PMS (red color): between PMS line and a line through Sm parallel to FH line. Blue dash line: postoperative ramus position.