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KMID : 0361920150450040180
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Korean Journal of Orthodontics
2015 Volume.45 No. 4 p.180 ~ p.189
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Differences in the mandibular premolar positions in Angle Class I subjects with different vertical facial types: A cone-beam computed tomography study
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Duan Jun
Deng Feng
Li Wan-Shan
Li Xue-Lei
Zheng Lei-Lei
Li Gui-Yuan
Bai Yan-Jie
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Abstract
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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-beamcomputed 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.
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KEYWORD
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Cone-beam computed tomography, Mandibular premolar, Tooth position, Vertical facial type
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