CBCT转化的二维平片与头颅侧位片对上气道二维测量的比较研究

Comparative Study of Two Dimensional Measurements of Upper Airway by Two Dimensional Plain Film Transformed by CBCT and Lateral Head of Skull

目的:研究三维CBCT转化的二维侧位片(CCB)和数值化头颅侧位片(LCR)对于上气道相同解剖部位的测量结果是否有差异,并且进行两种测量方法的可靠性分析。方法:将个别正常牙合志愿者的CCB和LCR分别导入Winceph8.0中进行上气道矢状面的距离测量;同一测试者分别进行3次测量;采用SPSS24.0统计软件,进行组内相关系数、配对t检验来检验不同测量的可靠性和统计学差异。结果:个别正常牙合志愿者的CCB和LCR分别对上气道进行测量,测量结果符合正态分布后,用配对t检验发现两组不同测量方法所得的PNS-Ba、PNS-Ad1、H-C3、H-FH有统计学差异;每项测量项目都进行3次测量,发现ICC值均大于0.75,说明两种测量方法可靠性均较高,但CBCT转化的二维平片ICC平均值为0.930,而头颅侧位片的ICC平均值为0.830,说明CBCT转化所得的二维平片可靠性高于头颅侧位片。结论:个别正常牙合的CCB和LCR在骨性标志点的测量值有统计学差异,而软组织标志点的测量值则没有统计学差异;两种测量方法可靠性均较高,但CCB可重复性高于LCR。

Objective:To study the differences of the same upper airway photographed by two-dimensional CBCT(CCB)and two-dimensional cranial lateral slice(LCR),and to analyze the reliability of two measurement methods.Methods:The CBCT of individual normal occlusion was transformed into two-dimensional radiographs.The two-dimensional CBCT and lateral cephalometric radiographs were respectively imported into Winceph8.0 to measure the airway distance.The intra-class correlation coefficient and the paired t test of variance were calculated in order by SPSS24.0 statistical software to test the reliability and the statistical significance of different measuring methods.Results:The results of pair t test found that there were statistical differences among PNS-Ba,PNS-Ad1,H-C3,and H-FH between two measurements.ICC values were all greater than 0.75,indicating the reliability of both measuring methods was relatively high.However,the average of ICC when transforming CBCT into a two-dimensional radiograph was 0.930,while that of lateral cephalometric radiographs was 0.830,indicating that the reliability of transforming CBCT data into two-dimensional radiographs was higher.Conclusion:The reliability of both measurement methods was high.However,the repeatability of transforming CBCT data into two-dimensional flat plate is higher than that of head lateral radiographs.