应用Ricketts分析法研究哈尔滨地区正常牙合锥形束CT

Study on CBCT of Normal Occlusion in Harbin Area by Rickitts Method

目的:比较三维及二维头影测量差异,并初步建立Ricketts分析法测量项目的正常值范围。方法:样本由30名正常牙合成人组成,同时拍摄锥形束CT(CBCT)和头颅侧位片,对Rickitts分析法的16个项目进行测量。CBCT图像导入SimplantO&O软件进行三维头影测量。头颅侧位片用硫酸纸描图定点进行二维头影测量。用组内相关系数(ICC)评价操作者的测量信度,采用配对t检验对两组间的差异进行比较。结果:10个测量项目的测量结果具有统计学意义,包括软组织测量项目:Ls-EP,Em-OP;角度:FH-NPog,MP-NPog,FH/NA,PP-FH,FH-MP,BaN-FH;线距:L1-APog,L1-OP。CBCT组ICC均值为0.871,2D组为0.935。结论:CBCT的测量与头颅侧位片的测量结果中,10个测量项目的测量结果比较有显著性差异,CBCT的可靠度和精确性较好。初步推断出哈尔滨地区Ricketts分析法部分参数的CBCT三维头影测量正常牙合参考值范围。

Objective To compare the differences between the three-dimensional and two-dimensional cephalometric measurements and to establish the normal value range of the project.Methods The samples were composed of 30 normal tooth synthesizers,and the CBCT and Lateral cephalometric radiograph were taken to measure the 16 items of Rickitts analysis.The CBCT image was imported into Simplant O&O software for 3D cephalometric measurement.The Lateral cephalometric radiograph was measured with the point of the sulfate paper.The correlation coefficient(ICC)was used to evaluate the measurement reliability in the operator,and the difference between the two groups was compared by the paired t test.Results The measurement results of 10 measurement items were statistically significant,including the soft tissue measurement project:Ls-EP,Em-OP;Angle:FH-NPog,MP-NPog,FH/NA,PP-FH,FH-MP,BaN-FH;Line distance:L1-APog,L1-OP.The ICC mean of CBCT group is 0.871,and the 2D group is 0.935.Conclusion The measurement results of CBCT and Lateral cephalometric radiograph were significantly different in 10 measurement items,and the reliability and accuracy of CBCT group were better than that of 2D group.It is inferred that the three-dimensional cephalometric of the CBCT of partial parameters of the Ricketts analysis method in the Harbin region is used to measure the normal tooth conjoint reference range.