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http://dx.doi.org/10.4041/kjod22.126

Crown-root angulations of the maxillary anterior teeth according to malocclusions: A cone-beam computed tomography study in Korean population  

Lee, Kyoung-Hoon (Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University)
Choi, Dong-Soon (Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University)
Jang, Insan (Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University)
Cha, Bong-Kuen (Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University)
Publication Information
The korean journal of orthodontics / v.52, no.6, 2022 , pp. 432-438 More about this Journal
Abstract
Objective: To compare crown-root angulations of the permanent maxillary anterior teeth in skeletal Class I, Class II, and Class III Korean malocclusion patients using cone-bean computed tomography (CBCT) images. Methods: Sixty CBCT images were collected from orthodontic patients archive based on skeletal Class I (0˚< A point-nasion-B point angle [ANB] < 4˚), Class II (ANB ≥ 4˚), and Class III (ANB ≤ 0˚) to have 20 samples in each group. Mesiodistal crown-root angulation (MDCRA) and labiolingual crown-root angulation (LLCRA) were evaluated after orientation of images. Crown-root angulations were compared among Class I, Class II, and Class III groups and among the maxillary anterior teeth in each group. Results: LLCRAs of the maxillary central incisor and the lateral incisor were significantly lower in Class III group than those in Class I group. However, those of the canine showed no significant differences among groups. MDCRAs of the maxillary anterior teeth did not significantly differ among groups either. Conclusions: Our results suggest that skeletal Class III malocclusion might affect LLCRA of the maxillary incisors, especially the central incisor.
Keywords
Computed tomography; Tooth shape; Class III; Malocclusion;
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