The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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Alveolar bone thickness around maxillary central incisors of different inclination assessed with cone-beam computed tomography

  • Tian, Yu-lou (Department of Orthodontics, School of Stomatology, China Medical University) ;
  • Liu, Fang (Department of Orthodontics, Shenyang Stomatology Hospital) ;
  • Sun, Hong-jing (Department of Orthodontics, School of Stomatology, China Medical University) ;
  • Lv, Pin (Department of Orthodontics, School of Stomatology, China Medical University) ;
  • Cao, Yu-ming (Department of Orthodontics, School of Stomatology, China Medical University) ;
  • Yu, Mo (Department of Orthodontics, School of Stomatology, China Medical University) ;
  • Yue, Yang (Department of Orthodontics, School of Stomatology, China Medical University)
  • Received : 2015.01.11
  • Accepted : 2015.05.06
  • Published : 2015.09.25
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Abstract

Objective: To assess the labial and lingual alveolar bone thickness in adults with maxillary central incisors of different inclination by cone-beam computed tomography (CBCT). Methods: Ninety maxillary central incisors from 45 patients were divided into three groups based on the maxillary central incisors to palatal plane angle; lingual-inclined, normal, and labial-inclined. Reformatted CBCT images were used to measure the labial and lingual alveolar bone thickness (ABT) at intervals corresponding to every 1/10 of the root length. The sum of labial ABT and lingual ABT at the level of the root apex was used to calculate the total ABT (TABT). The number of teeth exhibiting alveolar fenestration and dehiscence in each group was also tallied. One-way analysis of variance and Tukey's honestly significant difference test were applied for statistical analysis. Results: The labial ABT and TABT values at the root apex in the lingual-inclined group were significantly lower than in the other groups (p < 0.05). Lingual and labial ABT values were very low at the cervical level in the lingual-inclined and normal groups. There was a higher prevalence of alveolar fenestration in the lingual-inclined group. Conclusions: Lingual-inclined maxillary central incisors have less bone support at the level of the root apex and a greater frequency of alveolar bone defects than normal maxillary central incisors. The bone plate at the marginal level is also very thin.

Keywords

References

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