[锥形束CT在体内测量前磨牙长度的准确性研究]
[Investigation of accuracy of premolar length measured by cone beam CT in vivo].
作者信息
Feng Chi, Li Conghua, Zeng Xing-qi, Wang Qinhua, Zheng Qian, Qiu Ye
出版信息
Hua Xi Kou Qiang Yi Xue Za Zhi. 2014 Feb;32(1):36-9. doi: 10.7518/hxkq.2014.01.009.
OBJECTIVE
To investigate the feasibility and accuracy of length measurement of in vivo teeth by using cone beam CT (CBCT).
METHODS
Before orthodontic extraction, 109 vital premolars from 40 participants were scanned by using CBCT and reconstructed by using InVivoDental software. Buccal-lingual sectional images along the long axis of teeth were then acquired, and the crown, root, and tooth length were measured separately. After careful extraction and fixation, the corresponding length of the same tooth was measured by using a digital caliper. CBCT measurement accuracy was then verified by using physical measurements as reference.
RESULTS
CBCT and the physical method did not obtain significantly different measurements of the root, crown, and tooth length of experimental teeth (P=0.790, P=0.621, P=0.657, respectively), and the measurements were found to be consistent. The 95% limits of agreement of root, crown, and tooth length were -1.10 mm to 1.13 mm, -1.00 mm to 0.96 mm, and -1.00 mm to 1.05 mm, respectively.
CONCLUSION
The difference between CBCT and the physical method was not significant, and good consistency was shown. CBCT could be applied in noninvasive measurement of in vivo teeth.
目的
探讨使用锥形束CT（CBCT）测量离体牙长度的可行性和准确性。
方法
在正畸拔牙前，使用CBCT对40名参与者的109颗活髓前磨牙进行扫描，并使用InVivoDental软件进行重建。然后获取沿牙齿长轴的颊舌向断层图像，分别测量牙冠、牙根和牙齿长度。在仔细拔牙并固定后，使用数字卡尺测量同一颗牙齿的相应长度。然后以物理测量为参考验证CBCT测量的准确性。
结果
CBCT和物理方法对实验牙齿牙根、牙冠和牙齿长度的测量结果无显著差异（分别为P = 0.790、P = 0.621、P = 0.657），且测量结果一致。牙根、牙冠和牙齿长度的95%一致性界限分别为-1.10 mm至1.13 mm、-1.00 mm至0.96 mm和-1.00 mm至1.05 mm。
结论
CBCT与物理方法之间的差异不显著，且显示出良好的一致性。CBCT可应用于离体牙的无创测量。
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