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. 2010 Jul;80(4):531-6.
doi: 10.2319/100609-557.1.

Cervical vertebra morphology in different skeletal classes. A three-dimensional computed tomography evaluation

Miyuki Watanabe  1 , Tetsutaro Yamaguchi, Koutaro Maki
Affiliations

Cervical vertebra morphology in different skeletal classes. A three-dimensional computed tomography evaluation

Miyuki Watanabe et al. Angle Orthod. 2010 Jul.

Abstract

Objective: To describe cervical vertebra morphology in subjects with different anteroposterior jaw relationships.

Materials and methods: Cone-beam computed tomography images of 31 female subjects aged 19 to 41 years were evaluated. Subjects constituted two groups according to the ANB angle: group 1, skeletal Class II (ANB angle >5); and group 2, skeletal Class III (ANB angle <1). Nine linear measurements and one angular measurement were used to assess the vertebral morphology. The Mann-Whitney U-test was used for statistical analysis.

Results: The mean atlas dorsal arch height was significantly shorter in Class II subjects compared with those in Class III (P < .05). The cervical vertebra morphological analysis by cone-beam computed tomography was of comparable precision to three-dimensional computed tomography evaluations. This study confirmed previous findings that Class II subjects have significantly lower atlas dorsal arch heights.

Conclusion: The height of the atlas dorsal arch of cervical vertebrae is affected by the anteroposterior skeletal pattern.

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Figures

Figure 1
Figure 1
formula image Horizontal outer anteroposterior (AP) diameter of the first cervical vertebra (C1) (mm); HOAPC1. formula image Horizontal inner AP diameter of C1 (mm); HIAPC1. formula image Horizontal outer transverse diameter of C1 (mm); HOTDC1. formula image Distance between outer margin of transverse foramen and outer margin of lateral mass (mm); outer margin. formula image AP diameter of the superior surface of C1 anterior arch (mm); superior surface.
Figure 2
Figure 2
formula image Lateral outer AP diameter of C1 (mm); LOAPC1. formula image Height of the atlas dorsal arch (mm); dorsal arch.
Figure 3
Figure 3
formula image Frontal outer transverse diameter of C1 (mm); FOTDC1.
Figure 4
Figure 4
formula image Angle along axis line of the dens to occlusal plane; dens angle.
See this image and copyright information in PMC

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