Changes in height and inclination of the articular eminence during the growth period

Dong-Soon Choi; In-San Jang; Bong-Kuen Cha

doi:10.4041/kjod.2010.40.6.411

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Choi, Jang, and Cha: Changes in height and inclination of the articular eminence during the growth period

Original Article

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2010; 40(6): 411-420.

Published online: 31 December 2010

DOI: https://doi.org/10.4041/kjod.2010.40.6.411

Changes in height and inclination of the articular eminence during the growth period

Dong-Soon Choi, DDS, MSD, PhD^a, In-San Jang, DDS, PhD^b, Bong-Kuen Cha, DDS, MSD, DrMed, Dent^c

^aAssistant Professor, Department of Orthodontics, College of Dentistry, Research Institute for Oral Science, Gangneung-Wonju National University, Korea.

^bFull Time Lecturer, Department of Orthodontics, College of Dentistry, Research Institute for Oral Science, Gangneung-Wonju National University, Korea.

^cProfessor, Department of Orthodontics, College of Dentistry, Research Institute for Oral Science, Gangneung-Wonju National University, Korea.

Corresponding author: Bong-Kuen Cha. Department of Orthodontics, Research Institute for Oral Science, Gangneung-Wonju National University Dental Hospital, 120, Gangneungdaehangno, Jibyeon-dong, Gangneung 210-320, Korea. +82 33 640 3192; korth@gwnu.ac.kr.

Received 15 September 2010 Revised 1 December 2010 Accepted 3 December 2010

Abstract

Objective

The purpose of this study was to assess the changes in height and inclination of the articular eminence during the growth period.

Methods

One hundred and sixty subjects (71 males and 89 females) with a normal skeletal pattern and TMJ function, ranging in age from 5.9 to 19.7 years were divided according to their chronological age into six groups. Lateral individualized corrected TMJ tomograms were taken of all subjects, and the height and inclination of the articular eminence were measured. UNIANOVA was used to compare the differences between the age groups. Mann-Whitney test was used to compare the differences between male and female subjects.

Results

The height and the inclination of the articular eminence were increased and became steeper with age, and the height and the inclination were larger in male than in female subjects.

Conclusions

Dynamic changes in the height and the inclination of the articular eminence were observed during the growth period, therefore a full understanding of the growth of the articular eminence is important for orthodontic and orthopedic treatment in this period.

Keywords: TMJ, Tomography, Articular eminence, Growth

Figures and Tables

Fig. 1

Lateral individualized corrected TMJ tomogram. A, 7.9 year-old male; B, 12.6 year-old male; C, 18.7 year-old male.

Fig. 2

Measurement of height and inclination of eminence on tomogram. A, Superior point of the fossa; B, inferior point of the articular eminence; Line BC is parallel to the Frankfort horizontal plane; Line AC is perpendicular to the Frankfort horizontal plane and represents the height of the articular eminence; α, the angle between line AB and line BC; β, the angle between the best fit line of the posterior slope of the articular eminence and line BC.

Fig. 3

Scattergram and regression curve for the height and inclination of the articular eminence in male and female subjects. The height and the inclination of the articular eminence was significantly increased with aging (p < 0.001).

Fig. 4

Growth velocity of the height and inclination of the articular eminence in male and female subjects.

Table 1

Height and inclination of the articular eminence in males

SD, Standard deviation.

Table 2

Height and inclination of the articular eminence in females

SD, Standard deviation.

Table 3

Differences in height and inclination of the articular eminence between age groups

UNIANOVA and Helmert contrast in generalized linear model was used to compare the differences between the age groups. ^*p < 0.05; ^†p < 0.01; ^‡p < 0.001.

Table 4

Differences in height and inclination of the articular eminence between male and female subjects

Mann-Whitney test was used to compare the differences between male and female subjects. ^*p < 0.05.

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