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KMID : 0361920090390050300
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Korean Journal of Orthodontics
2009 Volume.39 No. 5 p.300 ~ p.309
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Correlation between menton deviation and dental compensation in facial asymmetry using cone-beam CT
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Park Soo-Byung
Park Jeong-Heuy
Jung Yun-Hoa
Cho Bong-Hae
Kim Yong-Il
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Abstract
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Objective: The purpose of this study was to evaluate the correlation between menton deviation and dental compensation in facial asymmetry.
Methods: Tooth axis and distance of first molar and canine to the reference plane were investigated by cone-beam computerized tomography. The subjects consisted of 50 patients with asymmetric mandibles (male 21, female 29, mean age 24.3 years). Control groups were also assessed (male 11, female 9, mean age 25.6 years). Nine measurements (5 linear measurements and 4 angular measurements) were measured in order to evaluate the correlation between menton deviation and the linear and angular difference of first molar and canine in the deviated and none-deviated sides using the defined MPR images. The differences between deviated and non-deviated side, according to menton deviation, were statistically analyzed using stepwise multiple regression analysis.
Results: From the result, Menton deviation was negatively correlated with mandibular first molar’s angular measurement (?∠LM6-Mn plane (dev.-ndev.)) and positively with maxillary fist molar’s angular measurement (?∠UM6-FH plane (dev.-ndev.)) (p ＜ 0.01). Two angular measurements (?∠LM6-Mn plane (dev.-ndev.), ?∠UM6-FH plane (dev.-ndev.)) explained the variability in menton deviation with a significant r2 value of 0.589.
Conclusions: This study suggests that the tooth axis of upper and lower first molars leans towards the deviated side of Menton when there is mandibular asymmetry with Menton deviation.
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KEYWORD
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Cone-beam computed tomography, Presurgical orthodontics, Occlusal plane, Menton deviation, Facial asymmetry
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