[1]顾永春,朱琦,周培刚,等.利用显微CT及三维重建软件Mimics测量牙根表面积[J].牙体牙髓牙周病学杂志,2013,23(12):757-762.
 GU Yong-chun,ZHU Qi,ZHOU Pei- gang,et al.Measurement of tooth root surface area by micro- CTand 3D reconstruction software Mimics[J].Chinese journal of conservative dentistry,2013,23(12):757-762.
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利用显微CT及三维重建软件Mimics测量牙根表面积
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《牙体牙髓牙周病学杂志》[ISSN:1006-6977/CN:61-1281/TN]

卷:
23
期数:
2013年12期
页码:
757-762
栏目:
论著
出版日期:
2013-12-31

文章信息/Info

Title:
Measurement of tooth root surface area by micro- CTand 3D reconstruction software Mimics
作者:
顾永春朱琦周培刚廖珍贵陈花花张燕萍
吴江区第一人民医院口腔科, 江苏 苏州 215200
Author(s):
GU Yong-chun ZHU Qi ZHOU Pei- gang LIAO Zhen-gui CHEN Hua-hua ZHANG Yan-pin
Department of Stomatology, the First People’s Hospital of Wujiang, Suzhou 215200, China
关键词:
牙根表面积 牙周膜面积 显微CT
Keywords:
root surface area area of periodontal membrane micro- CT
分类号:
R781
文献标志码:
A
摘要:
目的: 利用显微CT及三维重建软件Mimics对牙根表面积进行测量。方法:临床收集因牙周病或正畸减数拔除的恒牙10个,采用显微CT分别对其进行扫描,扫描时体素大小设为(15×15×15)μm;所得三维图像在Mimics 10.01界面下选择不同的XY平面像素尺寸(30、60、90、120、150、300μm)及Z轴层厚(30、60、120及150μm)进行三维重建;并设置不同的光顺参数(光滑因子分别为0.5、0.8和1,迭代次数分别为1、2、4、8、16、32、64)对模型进行光顺处理。探讨模型的体素尺寸与光顺度对牙根表面积测值的影响。结果:Mimics软件界面下,通过建立牙齿实心3D模型及沿着CEJ虚拟切割,能间接计算出CEJ平面的截面积及CEJ平面根方的牙体表面积。牙根表面积与光顺度关系曲线显示,随着光顺度增加,牙根表面积在曲线初始段快速下降,但在光滑因子等于1、迭代次数超过4~8次后,若在光顺操作时选择体积补偿项,则可使曲线逐渐走平,牙根表面积测值趋于稳定。若不选择体积补偿项,牙根表面积测值将随光顺度增加继续减小,但下降速度与初始阶段相比趋于平缓;模型精度越低,下降斜率越陡。结论:利用显微CT及Mimics三维模型软件能够准确测量牙根表面积;建模时恰当的体素尺寸及光顺度参数设置可以提高测量结果的准确性、重复性。
Abstract:
AIM: To explore the methodology of measurement of the root surface area (RSA) of human teeth by micro- CT and 3D reconstruction software Mimics. METHODS: 10 extracted permanent teeth were scanned by micro- CT with voxel size of 15×15×15μm. 3D tooth models were reconstructed by software Mimics 10.01. The pixel size in XY plane was set as 30, 60, 90, 120, 150 and 300μm, the slice thickness as 30, 60, 120 and 150 μm, respectively. Then the smoothing operation was performed to improve the smoothness of the models, the smooth factor was set as 0.5, 0.8 and 1, and the iterations (circles of the smoothing calculation) as 1, 2, 4, 8, 16, 32 and 64, respectively. The effects of the pixel size, slice thickness and smoothness of the models on the RSA values were analyzed. RESULTS: Under the interface of Mimics 10.01, 3D solid teeth models were reconstructed and could be virtually “cut” at the CEJ level. The area of the “cutting” plane and RSA could be calculated indirectly. The curve of the relationship between the RSA and smoothness of models showed, RSA decreased rapidly with iterations at the initial stage, but as the number of iterations was >4-8 (smooth factor=1), the curve get flatter and the RSA tended to be stable as volume compensation was selected; whereas as volume compensation was not selected, the RSA would decrease continuously, though at a relatively lower rate, and the decreasing rate was negatively correlated with the voxel size of the models. CONCLUSION: Micro-CT and software Mimics are useful tools for analysis of RSA. Proper selection of the voxel size and smoothing parameters may increase the accuracy and repeatability of the measurement results.

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更新日期/Last Update: 2013-12-30