Korean J Orthod.  2015 Jul;45(4):180-189. 10.4041/kjod.2015.45.4.180.

Differences in the mandibular premolar positions in Angle Class I subjects with different vertical facial types: A cone-beam computed tomography study

• Duan J
• Deng F
• Li WS
• Li XL
• Zheng LL
• Li GY
• Bai YJ

• KMID: 2400576
• DOI: http://doi.org/10.4041/kjod.2015.45.4.180

Abstract

OBJECTIVE
To compare the positions of the mandibular premolars in Angle Class I subjects according to vertical facial type. The results will provide a theoretical basis for predicting effective tooth movement in orthodontic treatment.
METHODS
Cephalometric parameters were determined using cone-beam computed tomography in 120 Angle Class I subjects. Subjects were categorized as short, normal, and long face types according to the Frankfort mandibular angle. Parameters indicating the position of the mandibular right premolars and the mandible were also measured.
RESULTS
The angle between the mandibular first premolar axis and buccal cortex, the distance between the root apex and buccal cortex, angle of vestibularization, arc of vestibularization, and root apex maximum movable distance were significantly greater in the short face type than in the long and norm face types. The angle between the mandibular second premolar axis and buccal cortex, the distance from root apex to buccal cortex, and the arc of vestibularization were significantly greater in the short face type than in the normal face type.
CONCLUSIONS
There are significant differences in the mandibular premolar positions in Class I subjects according to vertical facial type.

Keyword

Cone-beam computed tomography; Mandibular premolar; Tooth position; Vertical facial type

MeSH Terms

Axis, Cervical Vertebra
Bicuspid*
Cone-Beam Computed Tomography*
Malocclusion, Angle Class I*
Mandible
Tooth Movement

Figure

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  Figure 1 The cone-beam computed tomography image of the craniofacial region using InvivoDental 5.1 software. The transverse (A), sagittal (B), and coronal planes (C) are indicated.

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  Figure 2 Angle between the axis and the buccal cortex (Premo ax/bucc cort), and angle between the axis and the lingual cortex (Premo ax/ling cort). A representative cone-beam computed tomography image of the mandible through the coronal plane is shown.

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  Figure 3 Alveolar thickness and height measurements. A representative cone-beam computed tomography image of the mandible through the coronal plane is shown. Bucc, Buccal; Ling, lingual.

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  Figure 4 Distance from the resistance center of the mandibular premolar to its apex (R center-Apex) , and distance from the apex to the mandible edge (Apex-Mand edge). A representative cone-beam computed tomography image of the mandible through the coronal plane is shown.

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  Figure 5 Parameters indicating the range in tooth movement. A, Measurement of the vestibularization and lingualization angles (Ang vestibule and Ang lingual). B, Measurement of the vestibularization and lingualization arcs (Arc vestibule and Arc lingual). A representative cone-beam computed tomography image of the mandible through the coronal plane is shown.

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