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Immediate effects of mandibular posterior displacement on the pharyngeal airway space: A preliminary study

Korean Journal of Orthodontics 2020년 50권 2호 p.129 ~ 135
Choi Yeon-Ju, 김용일, 김성식, 박수병, 손우성, Kim Sung-Hun,
소속 상세정보
 ( Choi Yeon-Ju ) - Pusan National University Dental Hospital Department of Orthodontics
김용일 ( Kim Yong-Il ) - Pusan National University Dental Hospital Department of Orthodontics
김성식 ( Kim Seong-Sik ) - Pusan National University Dental Hospital Department of Orthodontics
박수병 ( Park Soo-Byung ) - Pusan National University Dental Hospital Department of Orthodontics
손우성 ( Son Woo-Sung ) - Pusan National University Dental Hospital Department of Orthodontics
 ( Kim Sung-Hun ) - Pusan National University Dental Hospital Department of Orthodontics

Abstract


Objective: This study aimed to evaluate the immediate effects of mandibular posterior displacement on the pharyngeal airway space (PAS) by using cephalometric evaluations and to investigate how the surrounding structures are schematically involved.

Methods: In this retrospective study, 38 subjects with functional Class III malocclusion and two lateral cephalograms were selected. The first lateral cephalogram was taken with the mandible in the habitual occlusal position, and the second in anterior edge-to-edge bite. Paired t-test was used to analyze changes in the PAS, hyoid bone, tongue, and soft palate, followed by mandibular posterior displacement. Pearson’s correlation analysis was used to determine the relationship between the amount of mandibular posterior displacement and other variables.

Results: A statistically significant decrease was observed in the PAS following mandibular posterior displacement. Along with mandibular posterior displacement, the tongue decreased in length (p < 0.001) and increased in height (p < 0.05), while the soft palate increased in length, decreased in thickness, and was posteriorly displaced (p < 0.001). The hyoid bone was also posteriorly displaced (p < 0.05). There was no correlation between the amount of mandibular posterior displacement and the measured variables.

Conclusions: The PAS showed a statistically significant decrease following mandibular posterior displacement, which was a consequence of retraction of the surrounding structures. However, there were individual variances between the amount of mandibular posterior displacement and the measured variables.

키워드

Lateral cephalogram; Airway; Mandibular posterior displacement

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