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《West China Journal of Stomatology》 2014-01
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Investigation of accuracy of premolar length measured by cone beam CT in vivo

Feng Chi;Li Conghua;Zeng Xingqi;Wang Qinhua;Zheng Qian;Qiu Ye;Dept. of Oral and Maxillofacial Surgery, The Affiliated Hospital of Stomatology, Chongqing Medical University;Chongqing Key Laboratory for Oral Diseases and Biomedical Sciences;University Town Clinic, The Affiliated Hospital of Stomatology, Chongqing Medical University;State Key Laboratory of Oral Diseases, Dept. of Cleft and Palate Surgery, West China Hospital of Stomatology, Sichuan University;  
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.
【Fund】: 重庆市科学技术委员会基金资助项目(cstc2013jcyjA10010)
【CateGory Index】: R816.98
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