Volumetric, planar, and linear analyses of pharyngeal airway change on computed tomography and cephalometry after mandibular setback surgery

Introduction: The purpose of this study was to use lateral cephalometry and computed tomography (CT) to examine the volumetric, planar, and linear changes in the pharyngeal airway after mandibular setback surgery. Methods: The pharyngeal airways of 12 subjects who underwent mandibular setback surgery at Seoul National University Dental Hospital were assessed linearly and volumetrically on lateral cephalometric radiographs and CT before surgery and 6 months after surgery. The pharynx, nasopharynx, and oropharynx were evaluated by volumetric analysis. Pharyngeal depth, airway space, pharyngeal soft-tissue thickness, and hyoid bone position were measured by linear analysis. The axial section area of the airway was measured by area analysis. Results: From the linear analysis, a significant decrease in pharyngeal depth and a significant posterior movement of the hyoid bone (P 0.05). Conclusions: Although the structures around the mandible inevitably moved backward after mandibular setback surgery on linear analysis, physiologic deformation could occur to preserve the airway capacity after sagittal compression. (Am J Orthod Dentofacial Orthop 2010;138:292-9)Shigeta Y, 2008, ORAL SURG ORAL MED O, V106, P563, DOI 10.1016/j.tripleo.2008.03.032Zhao XG, 2008, AM J ORTHOD DENTOFAC, V133, P661, DOI 10.1016/j.ajodo.2006.06.024Chen FS, 2007, AM J ORTHOD DENTOFAC, V131, P372, DOI 10.1016/j.ajodo.2005.06.028Eggensperger N, 2005, J CRANIO MAXILL SURG, V33, P111, DOI 10.1016/j.jcms.2004.10.004Saitoh K, 2004, AM J ORTHOD DENTOFAC, V125, P556LIUKKONEN M, 2002, INT J ADULT ORTHOD O, V17, P41Tselnik M, 2000, J ORAL MAXIL SURG, V58, P282Kragskov J, 1997, CLEFT PALATE-CRAN J, V34, P111Hochban W, 1996, INT J ORAL MAX SURG, V25, P333Aboudara C, 2009, AM J ORTHOD DENTOFAC, V135, P468, DOI 10.1016/j.ajodo.2007.04.043Kluemper GT, 1995, EUR J ORTHODONT, V17, P491CEYLAN I, 1995, AM J ORTHOD DENTOFAC, V108, P69PAE EK, 1994, AM J ORTHOD DENTOFAC, V106, P52GROSS AM, 1993, AM J ORTHOD DENTOFAC, V103, P526ATHANASIOU AE, 1991, AM J ORTHOD DENTOFAC, V100, P259RYAN CF, 1991, AM REV RESPIR DIS, V144, P428HELLSING E, 1989, EUR J ORTHODONT, V11, P359WILLIAMS PL, 1989, GRAYS ANATOMY, P1323WINNBERG A, 1988, AM J ORTHOD DENTOFAC, V94, P393RILEY RW, 1987, J ORAL MAXIL SURG, V45, P450BIBBY RE, 1984, AM J ORTHOD DENTOFAC, V85, P431BIBBY RE, 1981, AM J ORTHOD DENTOFAC, V80, P92RICKETTS RM, 1981, ANGLE ORTHOD, V51, P115GLOVER GH, 1980, MED PHYS, V7, P238MONTGOMERY WM, 1979, AM J ORTHOD DENTOFAC, V76, P363LIPTON MJ, 1978, RADIOLOGY, V127, P419MILLER SW, 1977, AM J ROENTGENOL, V129, P257WICKWIRE NA, 1972, J ORAL SURG, V30, P184TAKAGI Y, 1967, ORAL SURG ORAL MED O, V23, P688