Pre and postoperative changes in the morphology of pharyngeal airway in patients with skeletal mandibular prognathism─A comparison between Class 1 malocclusion and simultaneous maxillomandibular surgery─
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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<0.01). Discussion: Before treatment, we found out that the upper pharyngeal airway space was narrower and the lower part is wider than after treatment whereby we predicted that after treatment, the upper part would be wider and the lower part would be narrower. However, no significant difference was obtained in the group treated with simultaneous maxillomandibular surgery due to the complex three–dimensional movement of the maxilla. The trend shown in the hypothesis was not recognized. Conclusion: When simultaneous maxillomandibular surgery was carried out to treat cases of skeletal mandibular prognathism, the pharyngeal airway (PPS) significantly increased after surgery. Meanwhile, the lower part of the airway decreased.
雑誌名
松本歯学
雑誌名(英)
Journal of the Matsumoto Dental University Society
Pre and postoperative changes in the morphology of pharyngeal airway in patients with skeletal mandibular prognathism─A comparison between Class 1 malocclusion and simultaneous maxillomandibular surgery─
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