The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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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)
  • Received : 2022.05.31
  • Accepted : 2022.08.19
  • Published : 2022.11.25
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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.

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References

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