中国实用口腔科杂志

中国实用口腔科杂志

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锥形束 CT定位上颌阻生尖牙临床分析

冯婧a，李志民a，王博a，闫弘静a，宋子琦a，鞠昊a，公柏娟b   

  1. 吉林大学口腔医院a放射线科，b正畸科，吉林  长春  130021
  • 出版日期:2018-02-15 发布日期:2018-03-13
  • 基金资助:

    吉林省科技发展计划项目（20170414047GH）

  • Online:2018-02-15 Published:2018-03-13

摘要：

目的    利用锥形束 CT（CBCT）对上颌阻生尖牙的三维阻生位置及其邻近切牙的牙根吸收情况进行研究。方法    2015 年12月至2017年1月吉林大学口腔医院就诊患者的CBCT资料中选取67例上颌尖牙阻生患者资料，应用Invivo5.4.5 软件进行三维成像，在矢状、冠状、轴切面视图中对每颗阻生尖牙进行定位，分析上颌阻生尖牙的三维阻生位置及其邻近切牙的根吸收情况。结果    67例患者83颗阻生牙，除10颗水平阻生尖牙（12.0%）与1颗倒置阻生尖牙（1.2%）外，矢状面视图中28颗上颌阻生尖牙（33.7%）处于唇侧位置，25颗（30.1%）处于腭侧位置，19颗（22.9%）处于中位；冠状面视图中10颗上颌阻生尖牙（12.0%）牙尖位于邻切牙牙冠部，35颗（42.2%）牙尖位于邻切牙根颈1/3，20颗（24.1%）牙尖位于邻切牙根中部1/3，8颗（9.6%）牙尖位于邻切牙根尖1/3，10颗（12.0%）牙尖位于邻切牙根尖部；轴切面视图中10颗上颌阻生尖牙（12.0%）处于远中向位置，54颗（65.1%）处于近中向位置，8颗（9.6%）处于中位。24颗（17.9%）侧切牙牙根发生吸收，13颗（9.7%）中切牙牙根发生吸收，差异有统计学意义（P＜0.05）。结论      CBCT可较好地对上颌阻生尖牙位置和邻牙吸收情况进行诊断与分析，为上颌阻生尖牙的治疗提供指导。

关键词: 锥形束CT, 上颌尖牙阻生, 三维分析, 牙根吸收

Abstract:

Objective    To evaluate the position of maxillary impacted canines and resorption of neighboring incisors with cone beam computed tomography （CBCT）. Methods    Impacted maxillary canines in sixty-seven patients were selected and scanned by the Planmeca ProMax 3D at Stomatological Hospital of Jilin University from Dec.2015 to Jan.2017. The three-dimensional images were obtained by Invivo 5.4.5 software. Each impacted canine was positioned and the root resorption of adjacent incisors was observed in sagittal，coronal and axial views. Results    In sagittal plane view，except 10 horizontal impacted canines （12.0%） and 1 inverted impacted canine （1.2%），33.7% of impactions were labial，30.1% were palatal，and 22.9% were middle. In coronal plane view，12.0% of the cusp tips of maxillary impacted canines were near the crown of the adjacent incisor，42.2% were near cervical third of the root of the adjacent incisor，24.1% were near middle third of the root of the adjacent incisor，9.6% were near apical third of the root of the adjacent incisor，and 12.0% were near the root tip of the adjacent incisor.In axial plane view，65.1% of impactions were mesial，12.0% of impactions were distal，and 9.6% were middle. About 17.9% lateral incisors had root resorption，and 9.7% central incisors （13） had root resorption，the difference being statistical （P < 0.05）. Conclusion    CBCT is a better way in the diagnosis and analysis of the position and root resorption of maxillary impacted canines，which provides guidance to the treatment.

Key words: cone-beam CT, maxillary impacted canine, three dimensional analysis, root resorption