顎変形症（骨格性下顎前突症）における咽頭気道形態の術前術後の変化─上下顎同時移動術と1級不正咬合の比較─

Objective: Many reports mentioned the reduction of pharyngeal airway space after orthognathic surgery in patients with skeletal mandibular prognathism. We examined the pharyngeal airway space in patients treated with simultaneous maxillomandibular surgery and presented our findings. Materials and Methods: Records of 31 patients treated with simultaneous maxillomandibular surgery (case group) and 28 patients with Class 1 malocclusion treated with orthodontic treatment alone (control group) were examined from the pre treatment. The size of the pharyngeal airway (at 5 locations) in the control and case groups at pre– and post–treatments were analyzed through ANCOVA. Also the change in the size of the pharyngeal airway (at 5 locations) between pre– and post– treatments in each group were analyzed through ANCOVA. Results: (1) At the pre treatment, we found out that SPPS (soft palate to the posterior pharyngeal wall) in the case group was significantly wider than the control group (p<0.05) however, multiple comparisons showed no significant difference. (2) After treatment, the SPPS and MPS (PSP to the posterior pharyngeal wall) in the case group were significantly wider than in the control group (p<0.05) nevertheless, multiple comparisons showed no significant difference. (3) The width of the pharyngeal airway before and after treatment was compared between the control and the case group. In the control group, PPS (PNS to the posterior pharyngeal wall) after treatment was significantly larger than before treatment but multiple comparisons showed no significant difference. In the case group, PPS was larger after treatment than before treatment and multiple comparisons showed significant difference (p