JOURNAL OF SHANDONG UNIVERSITY (HEALTH SCIENCES) ›› 2014, Vol. 52 ›› Issue (8): 90-93.doi: 10.6040/j.issn.1671-7554.0.2014.019

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Prevalence and characteristics of tooth agenesis among orthodontic patients in Qinghai Province

HE Wucheng1,2, LIU Ying2, LI Zhenya3   

  1. 1. Department of Orthodontics, School of Stomatology, Ningxia Medical University, Yinchuan 750004, Ningxia, China;
    2. Department of Orthodontics, Xining First People's Hospital, Xining 810000, Qinghai, China;
    3. Stomatological Centre, People's Hospital of Gansu Province, Lanzhou 730000, Gansu, China
  • Received:2014-01-09 Revised:2014-07-02 Online:2014-08-10 Published:2014-08-10

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Abstract: Objective To investigate the prevalence and characteristics of tooth agenesis among orthodontic patients treated in Xining First People's Hospital of Qinghai Province. Methods A total of 2 911 patients treated during 2007 to 2012 were selected, and divided into 3 groups: 1 missing-tooth group, 2 missing-teeth group and 3 missing-teeth group. Relevant data were collected and analyzed. Results The prevalence of congenital tooth agenesis was 7.7%, and tooth agenesis was more prevalent in females than in males (P<0.05). Altogether 95.6% patients missed 1-2 teeth, and the number of missing mandibular lateral incisor was 150 (44.2%). The lower mandible had higher percentage of missing teeth, while the left and right had similar percentage. There were significant differences among the 3 groups in the sites of missing teeth (P<0.01). Conclusions The prevalence of congenital tooth agenesis was 7.7% among orthodontic patients in Qinghai Province. The most common missing tooth was the mandibular lateral incisor, and majority of patients missed one or two teeth. When one or two teeth were missing, the site of missing teeth was more often the incisor area; when more than two teeth were missing, the site was more often the posterior area.

Key words: Tooth agenesis, Prevalence, Investigation

CLC Number: 

  • R783.4
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