Correlation between menton deviation and dental compensation in facial asymmetry using cone-beam CT

Soo-Byung Park; Jeong-Heuy Park; Yun-Hoa Jung; Bong-Hye Jo; Yong-Il Kim

doi:10.4041/kjod.2009.39.5.300

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Park, Park, Jung, Jo, and Kim: Correlation between menton deviation and dental compensation in facial asymmetry using cone-beam CT

Original Article

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2009; 39(5): 300-309.

Published online: 31 October 2009

DOI: https://doi.org/10.4041/kjod.2009.39.5.300

Correlation between menton deviation and dental compensation in facial asymmetry using cone-beam CT

Soo-Byung Park, DDS, MSD, PhD^a, Jeong-Heuy Park, DDS, MSD^b, Yun-Hoa Jung, DDS, MSD, PhD^c, Bong-Hye Jo, DDS, MSD, PhD^c, Yong-Il Kim, DDS, MSD^d

^aProfessor, Department of Orthodontics, School of Dentistry, Pusan National University, Korea.

^bGraduate Student, Department of Orthodontics, School of Dentistry, Pusan National University, Korea.

^cAssociate Professor, Department of Oral & Maxillofacial Radiology, School of Dentistry, Pusan National University, Korea.

^dFellow, Department of Orthodontics, School of Dentistry, Pusan National University, Korea.

Corresponding author: Yong-Il Kim. Department of Orthodontics, School of Dentistry, Pusan National University Hospital, 305, Gudeok-ro, Seo-gu, Busan 623-739, Korea. +82 51 240 7443, kimyongil@pusan.ac.kr

Received 6 April 2009 Revised 21 August 2009 Accepted 23 August 2009

Abstract

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 (Δ∠LM6-Mn plane (dev.-ndev.)) and positively with maxillary fist molar's angular measurement (Δ∠UM6-FH plane (dev.-ndev.)) (p < 0.01). Two angular measurements (Δ∠ LM6-Mn plane (dev.-ndev.), Δ∠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.

Keywords: Cone-beam computed tomography, Presurgical orthodontics, Occlusal plane, Menton deviation, Facial asymmetry

Figures and Tables

Fig. 1

Reference planes. A, F-H plane was constructed by connecting both sides of Po and right of Or. MSR plane was perpendicular to FH plane passing through Na and Ba; B, Mn plane was constructed by Me and both sides of Go.

Fig. 2

Linear and angular measurements. A, Distance and angle of U3-FH plane on Ray-sum image which was set by overlapped images on the reference planes; B, distance and angle of UM6-FH plane on MRP image; C, distance and angle of LM6-Mn plane on MRP image.

Table 1

Reference points and planes

Table 2

Measurements

Table 3

Comparison of mean and standard deviation of the deviated/non-deviated side difference at upper & lower first molars and canines (control group & experimental group)

SD, standard deviation; ^*p < 0.05; ^†p < 0.01; ±: to subtract the value of non-deviated side from the value of deviated side.

Table 4

Bivariate Pearson correlation between Me deviation and angular measurements

^*p < 0.01.

Table 5

Regression analysis

^*p < 0.01.

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