Journal of Oral Science Research ›› 2018, Vol. 34 ›› Issue (9): 956-959.DOI: 10.13701/j.cnki.kqyxyj.2018.09.009

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Study on Extraction Models for Anterior Deep Overjet Patients with Congenital Hypodontia of A Mandibular Central Incisor.

ZHANG Xi1, WANG Xiang2, WANG Lin1, GU Yan1, WU Ke1, ZHAO Chun-Yang1*.   

  1. 1.Jiangsu Key Laboratory of Oral Diseases, Department of Orthodontics, Affiliated Stomatological Hospital of Nanjing Medical University, Nanjing 210029, China;
    2. Department of Stomatology, The First People's Hospital of Nantong, Nantong 226001, China.
  • Received:2018-03-01 Online:2018-09-28 Published:2018-09-25

Abstract: Objective: To investigate the orthodontic treatment outcome of anterior deep overjet patients with congenital hypodontia of a mandibular central incisor using PAR index. Methods: This retrospective study included thirty-six deep overjet patients with congenital hypodontia of a mandibular central incisor. Eighteen patients who extracted maxillary first premolars were in group A. Other eighteen patients who extracted maxillary first premolars and a mandibular premolar were in group B. Group A and B were measured and analyzed according to the PAR indexs and cephalometrics before and after orthodontic treatment. Results: The difference in the weighted PAR scores and each of the PAR scores were statistically significant (P<0.01). There were significant changes in posterior occlusal relationship (P<0.05) and midline (P<0.01) in group B. Conclusion: Extraction of two maxillary premolars and one mandibular premolar could achieve more satisfactory occlusal relationship to anterior deep overjet patients with congenital hypodontia of a mandibular central incisor.

Key words: Anterior deep overjet , Congenital hypodontia of mandibular central incisor , Extraction models , Peer assement rating index , Cephalometric analysis