Effect of extraction treatment on upper airway dimensions in patients with bimaxillary skeletal protrusion relative to their vertical skeletal pattern
Cho Ha-Nul, 윤현주, 박재현, 박영국, 김수정,
소속 상세정보
( Cho Ha-Nul ) - Kyung Hee University Graduate School Department of Dentistry
윤현주 ( Yoon Hyun-Joo ) - Kyung Hee University Graduate School Department of Dentistry
박재현 ( Park Jae-Hyun ) - Kyung Hee University Graduate School Department of Dentistry
박영국 ( Park Young-Guk ) - Kyung Hee University School of Dentistry Department of Orthodontics
김수정 ( Kim Su-Jung ) - Kyung Hee University School of Dentistry Department of Orthodontics
Abstract
Objective: To investigate dimensional changes in regional pharyngeal airway spaces after premolar extraction in bimaxillary skeletal protrusion (BSP) patients according to vertical skeletal pattern, and to further identify dentoskeletal risk factors to predict posttreatment pharyngeal changes.
Methods: Fifty-five adults showing BSP treated with microimplant anchorage after four premolar extractions were included in this retrospective study. The subjects were divided into two groups according to the mandibular plane steepness: hyperdivergent (Frankfort horizontal plane to mandibular plane [FH-MP] ≥ 30) and nonhyperdivergent groups (FH-MP < 30). The control group consisted of 20 untreated adults with skeletal Class I normodivergent pattern and favorable profile. Treatment changes in cephalometric variables were evaluated and compared. The association between posttreatment changes in the dentoskeletal and upper airway variables were analyzed using linear regression analysis.
Results: The BSP patients showed no significant decrease in the pharyngeal dimensions to the lower level in comparison with controls, except for middle airway space (MAS, p < 0.01). The upper airway variable representing greater decrease in the hyperdivergent group than in the nonhyperdivergent group was the MAS (p < 0.01). Posttreatment changes in FH-MP had negative correlation with changes in MAS (β = ?0.42, p < 0.01) and inferior airway space (β = ?0.52, p < 0.01) as a result of multivariable regression analysis adjusted for sagittal skeletal relationship.
Conclusions: Decreased pharyngeal dimensions after treatment in BSP patients showed no significant difference from the normal range of pharyngeal dimensions. However, the glossopharyngeal airway space may be susceptible to treatment when vertical dimension increased in hyperdivergent BSP patients.
키워드
Airway; Cephalometrics; bimaxillary skeletal protrusion; vertical skeletal pattern
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