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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.

Duan J, Deng F, Li WS, Li XL, Zheng LL, Li GY, Bai YJ - Korean J Orthod (2015)

Bottom Line: 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.There are significant differences in the mandibular premolar positions in Class I subjects according to vertical facial type.

View Article: PubMed Central - PubMed

Affiliation: Department of Stomatology, Ministry of Education Key Laboratory of Child Development and Disorders, 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.

No MeSH data available.


Related in: MedlinePlus

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 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.

Mentions: The relationship between the mandibular premolar and the mandible was determined by measuring the angle between the axis of the mandibular premolar and the buccal cortex, defined as the Premo ax/bucc cort (°), and measuring the angle between the axis of the mandibular premolar and the lingual cortex, defined as the Premo ax/ling cort (°), as shown in Figure 2.


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 - Korean J Orthod (2015)

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.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4524957&req=5

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.
Mentions: The relationship between the mandibular premolar and the mandible was determined by measuring the angle between the axis of the mandibular premolar and the buccal cortex, defined as the Premo ax/bucc cort (°), and measuring the angle between the axis of the mandibular premolar and the lingual cortex, defined as the Premo ax/ling cort (°), as shown in Figure 2.

Bottom Line: 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.There are significant differences in the mandibular premolar positions in Class I subjects according to vertical facial type.

View Article: PubMed Central - PubMed

Affiliation: Department of Stomatology, Ministry of Education Key Laboratory of Child Development and Disorders, 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.

No MeSH data available.


Related in: MedlinePlus