锥形束CT用于评价离体牙槽骨高度准确性的研究

目的评价锥形束CT（CBCT）图像测量离体牙槽骨高度的准确性和可重复性，为其应用于牙周病的临床诊断和预后评价提供理论依据。方法使用CBCT对8具干燥下颌骨进行扫描，在图像上重复测量236个人工选择标志点处牙槽嵴顶至釉牙骨质界的距离；同时使用游标卡尺直接测量以上标志点处牙槽嵴顶至釉牙骨质界的距离。应用SPSS 13.0软件对所得数据进行统计学分析。结果CBCT图像对牙槽嵴顶至釉牙骨质界距离的重复测量结果间差异无统计学意义（P>0.05）；CBCT图像与游标卡尺对牙槽嵴顶至釉牙骨质界距离的测量结果间差异也无统计学意义（P>0.05）。结论CBCT图像可清晰显示牙与牙槽骨之间的空间解剖关系，其对牙槽骨高度体外测量的结果具有准确性和可重复性。

Evaluation of the accuracy of alveolar bone height measurement in vitro by cone beam computed tomography

Objective To evaluate the accuracy and repeatability of alveolar bone height measurement in vitro by cone beam computed tomography（CBCT）, and to provide theoretical application of CBCT in periodontal clinic. Methods Eight dry mandibles with 236 selected markers were scanned by CBCT scanner, and the distance from alveolar ridge crest to cemento-enamel junction were measured on every marker by the images of CBCT. Meanwhile the distances on the dry mandibles were measured directly by vernier caliper. All the data were analyzed by SPSS 13.0 statistics software. Results There was no significant difference between the two repeated measurements by the CBCT images （P>0.05）, and no significant difference were found between the measurement by the CBCT images and by vernier caliperas well（P>0.05）. Conclusion The CBCT images could demonstrate the three-dimensional relationships between tooth and alveolar bone accurately. As far as the height of alveolar bone measurement was concerned, CBCT show good accuracy and repeatability in vitro.