Differences in the mandibular premolar positions in Angle Class I subjects with different vertical facial types: A cone-beam computed tomography study
Duan Jun, Deng Feng, Li Wan-Shan, Li Xue-Lei, Zheng Lei-Lei, Li Gui-Yuan, Bai Yan-Jie,
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( Duan Jun ) - Childrens Hospital of Chongqing Medical University Ministry of Education Key Laboratory of Child Development and Disorders Department of Stomatology
( Deng Feng ) - Chongqing Medical University College of Stomatology Department of Orthodontics
( Li Wan-Shan ) - Childrens Hospital of Chongqing Medical University Ministry of Education Key Laboratory of Child Development and Disorders Department of Stomatology
( Li Xue-Lei ) - Childrens Hospital of Chongqing Medical University Department of Otorhinolaryngology
( Zheng Lei-Lei ) - Chongqing Medical University College of Stomatology Department of Orthodontics
( Li Gui-Yuan ) - Childrens Hospital of Chongqing Medical University Ministry of Education Key Laboratory of Child Development and Disorders Department of Stomatology
( Bai Yan-Jie ) - Chongqing Medical University College of Stomatology Department of Orthodontics
KMID : 0361920150450040180
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-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.
키워드
Cone-beam computed tomography; Mandibular premolar; Tooth position; Vertical facial type
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