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

IF 1.9 3区医学 Q1 Dentistry Korean Journal of Orthodontics Pub Date : 2022-11-25 Epub Date: 2022-08-23 DOI:10.4041/kjod22.126

Kyoung-Hoon Lee, Dong-Soon Choi, Insan Jang, Bong-Kuen Cha

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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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根据错颌的上颌前牙冠根角度:在韩国人口的锥束计算机断层研究。

目的:比较韩国ⅰ类、ⅱ类和ⅲ类骨骼错颌患者上颌恒牙冠根角度的锥形豆ct (CBCT)成像。方法:根据骨骼I类(0˚< A点- b点夹角[ANB] < 4˚)、II类(ANB≥4˚)、III类(ANB≤0˚)，从正畸患者档案中收集60张CBCT图像，每组20张。定位后评价中远端冠根成角(MDCRA)和唇舌冠根成角(LLCRA)。比较I类组、II类组和III类组以及各组上颌前牙的冠根角度。结果:III类组上颌中切牙和侧切牙的LLCRAs明显低于I类组。然而，犬类在不同组间无显著差异。上颌前牙MDCRAs组间差异无统计学意义。结论:骨骼III类错牙合可能影响上颌切牙，尤其是中切牙的LLCRA。

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来源期刊

Korean Journal of Orthodontics Dentistry-Orthodontics

CiteScore

2.60

自引率

10.50%

发文量

审稿时长

3 months

期刊介绍： The Korean Journal of Orthodontics (KJO) is an international, open access, peer reviewed journal published in January, March, May, July, September, and November each year. It was first launched in 1970 and, as the official scientific publication of Korean Association of Orthodontists, KJO aims to publish high quality clinical and scientific original research papers in all areas related to orthodontics and dentofacial orthopedics. Specifically, its interest focuses on evidence-based investigations of contemporary diagnostic procedures and treatment techniques, expanding to significant clinical reports of diverse treatment approaches. The scope of KJO covers all areas of orthodontics and dentofacial orthopedics including successful diagnostic procedures and treatment planning, growth and development of the face and its clinical implications, appliance designs, biomechanics, TMJ disorders and adult treatment. Specifically, its latest interest focuses on skeletal anchorage devices, orthodontic appliance and biomaterials, 3 dimensional imaging techniques utilized for dentofacial diagnosis and treatment planning, and orthognathic surgery to correct skeletal disharmony in association of orthodontic treatment.