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

Affiliations
  • 1Department of Stomatology, Ministry of Education Key Laboratory of Child Development and Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China.
  • 2Department of Orthodontics, College of Stomatology, Chongqing Medical University, Chongqing, China. yanjiebai@aol.com
  • 3Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences, Chongqing Medical University, Chongqing, China.
  • 4Department of Otorhinolaryngology, Children's Hospital of Chongqing Medical University, Chongqing, China.

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
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