锥形束CT对下颌前磨牙髓腔三维重建的精度分析

doi:10.19439/j.sjos.2018.02.007

上海口腔医学 ›› 2018, Vol. 27 ›› Issue (2): 146-149.doi: 10.19439/j.sjos.2018.02.007

锥形束CT对下颌前磨牙髓腔三维重建的精度分析

李骏¹, 潘乙怀¹, 赵瑜¹, 李玲²

1.温州医科大学附属口腔医院牙体牙髓病科,2.儿童口腔科,浙江温州 325027

收稿日期:2017-06-26 修回日期:2017-08-31 出版日期:2018-04-25 发布日期:2018-05-14
通讯作者: 李玲,E-mail: lealyne@163.com
作者简介:李骏（1981-）,男,硕士,主治医师,E-mail: endo_lijun@aliyun.com
基金资助:
温州市科技计划项目（Y20140333）

Accuracy of 3D reconstruction of pulp cavity in mandibular premolars based on cone-beam CT

LI Jun¹, PAN Yi-huai¹, ZHAO Yu¹, LI Ling²

1.Department of Endodontics, 2.Department of Pediatric Dentistry, School and Hospital of Stomatology, Wenzhou Medical University. Wenzhou 325027, Zhejiang Province, China

Received:2017-06-26 Revised:2017-08-31 Online:2018-04-25 Published:2018-05-14

摘要/Abstract

摘要： 目的:评价锥形束CT（cone-beam CT, CBCT）对下颌前磨牙髓腔三维重建的精度。方法:选取32颗单根下颌前磨牙,分别采用显微CT(micro-CT)和CBCT进行扫描,对髓腔进行三维重建,分别提取髓腔的三维表面模型和三维体积模型。在Amira 5.0软件中对髓腔表面模型配准后,以micro-CT重建的髓腔模型为参考,检测CBCT重建模型和其相比的形态差异,进行色阶图颜色标示,记录整体形态的三维偏差值并分析2种扫描图像对髓腔体积重建的测量值差异。采用SPSS 13.0软件包对数据进行统计学分析。结果:32颗牙的三维形态偏差RSM值平均为0.27 mm,最大的形态差异分布于髓腔的根尖段和一些细小的解剖变异结构。Micro-CT和CBCT重建髓腔模型的体积测量值分别为(34.89±4.36) mm3和(27.32±4.83) mm3, 差异具有显著性（P<0.05）。结论:利用CBCT扫描图像对下颌前磨牙髓腔进行三维重建时,存在着一定程度的结构丢失,且多位于根尖段和细小的解剖变异部位。口腔临床医师在利用CBCT辅助诊疗时,应考虑到以上特点。

关键词: 锥体束CT, 显微CT, 下颌前磨牙, 髓腔, 三维重建, 形态差异, 体积测量

Abstract: PURPOSE: To analyze the accuracy of 3D reconstruction of pulp cavity in mandibular premolars based on cone-beam CT (CBCT). METHODS: Thirty-two extracted single-rooted mandibular premolars were randomly collected and scanned by micro-CT and CBCT. After image segmentation and 3D reconstruction, the surface model and volume model of the pulp cavity were rendered. By using Amira 5.0 software, each pairs of pulp cavity surface models were registered. The surface models reconstructed from micro-CT scanning were set as the references and the surface models reconstructed from CBCT were tested. The morphological differences between each pairs of surface models were calculated by Amira 5.0 software and represented by color-coded maps. The total 3D morphological difference value of each sample was recorded and the volume reconstruction differences between the two image acquisition techniques were analyzed. Statistical analysis was performed with SPSS 13.0 software package. RESULTS: The mean value of 3D morphological differences of 32 teeth was 0.27 mm. Distribution of the greatest morphological differences were mainly located in the apical portion of the pulp cavity and some small anatomical variation. The volume of the reconstructed models by micro-CT and CBCT were (34.89±4.36) mm3 and (27.32±4.83) mm3 respectively, and the difference was significant (P<0.05). CONCLUSIONS: When CBCT scanning is used to reconstruct pulp cavity of mandibular premolars, there is certain degree of information loss, which mainly distributes in the apical portion and small anatomical variation sites. Dentists should consider these characteristics during clinical application of CBCT.

Key words: Cone-beam CT, Micro-CT, Mandibular premolars, Pulp cavity, 3D reconstruction, Morphological differences, Volume measurement

中图分类号:

R783.1

李骏, 潘乙怀, 赵瑜, 李玲. 锥形束CT对下颌前磨牙髓腔三维重建的精度分析[J]. 上海口腔医学, 2018, 27(2): 146-149.

LI Jun, PAN Yi-huai, ZHAO Yu, LI Ling. Accuracy of 3D reconstruction of pulp cavity in mandibular premolars based on cone-beam CT[J]. Shanghai Journal of Stomatology, 2018, 27(2): 146-149.

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锥形束CT对下颌前磨牙髓腔三维重建的精度分析

Accuracy of 3D reconstruction of pulp cavity in mandibular premolars based on cone-beam CT

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