Journal of Prevention and Treatment for Stomatological Diseases ›› 2020, Vol. 28 ›› Issue (6): 367-371.doi: 10.12016/j.issn.2096-1456.2020.06.005

• Cinical Study • Previous Articles     Next Articles

Clinical analysis of skeletal malocclusion, axial inclination in patients with short root anomaly of the maxillary central incisors

YANG Yang1,YU Zhishuang1,DUAN Xiaoyuan1,WU Weili1,DENG Yi1(),YAO Ji2   

  1. 1. Department of Orthodontics, Yunnan Medical Hospital of Stomatology, Kunming Medical University, Kunming 650106, China
    2. Faculty of Engineering and Architecture, Kunming University of Science and Technology, Kunming 650000, China
  • Received:2019-09-06 Revised:2019-12-18 Online:2020-06-20 Published:2020-05-28
  • Contact: Yi DENG E-mail:kq-dy@163.com

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Abstract:

Objective To investigate the prevalence and distribution of skeletal malocclusion and axial inclination of the maxillary central incisors in short root anomaly (SRA) patients in Kunming city, to provide some reference and guidance for SRA patients′ clinical diagnosis and treatment and prevention in SRA patients. Methods A total of 1 000 cases were randomly selected from the CBCT database of patients admitted to the author′s hospital from January 2011 to July 2019, and a retrospective analysis was performed. A total of 27 patients with SRA were diagnosed (SRA group).The control group, consisted of 100 randomly selected patients from non-SRA patients. According to the clinical data and cephalometric data, skeletal malocclusion was divided into three subgroups: Class I skeletal malocclusion, Class II skeletal malocclusion and Class Ⅲ skeletal malocclusion. Additionally, the axial inclination of the central incisors was divided into three subgroups: the lingual inclination group, labial inclination group and normal inclination group. The two groups each according to sex, skeletal malocclusion and types of axial inclination of the maxillary central incisors were discussed. Results The prevalence rate of SRA in the selected population was 2.7%, and the prevalence of SRA in females was 3.67% (21/572) , which was higher than that in males by 1.4% (6/428), and was significantly different between sexes (χ2=4.562, P=0.033). There was a significant difference between SRA patients and control group in terms of skeletal malocclusion (χ2=8.710, P=0.013). Class Ⅲ skeletal malocclusion was the main type of skeletal malocclusion in SRA. There was a significant difference between SRA patients and control group in terms of the axial inclination of the maxillary central incisors (χ 2=16.75,P<0.001). Lingual inclination of the maxillary central incisors was the main type of axial inclination of the maxillary central incisors in SRA. Conclusion There is a certain correlation between class Ⅲ skeletal malocclusion and lingual inclination of the maxillary central incisors and SRA, and the root-crown ratio and root shape of these patients should be evaluated before orthodontics are implemented.

Key words: short root anomaly, root-crown ratio, maxillary central incisors, orthodontics, skeletal malocclusion, axial inclination

CLC Number: 

  • R783.5

Figure 1

Variables measured in the cone beam computed tomography scans A： reference line of the cementoenamel junction （CEJ）; R： root length; C： crown length"

Table 1

Distribution of skeletal malocclusion in SRA patients"

Group Skeletal malocclusion Total χ2 P
Class Ⅰ Class Ⅱ Class Ⅲ
Controls 47 29 24 100 8.710 0.013
SRA 6 7 14 27
Total 53 36 38 127

Table 2

Distribution of axial inclination of the maxillary central incisors in SRA patients"

Group Axial inclination Total χ2 P
Labial
inclination		 Lingual
inclination		 Normal
inclination
Controls 21 28 51 100 16.75 <0.001
SRA 6 18 3 27
Total 27 46 54 127
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