Sakabe J, Kuroki Y, Fujimaki S, Nakajima I, Honda K
School of Dentistry, Department of Pediatric Dentistry, Nihon University, 1-8-13 Kanda Surugadai, Chiyoda-ku, Tokyo, Japan 101-0062.
Dentomaxillofac Radiol. 2007 Jan;36(1):2-6. doi: 10.1259/dmfr/65418489.
The purpose of this investigation was to determine the reproducibility among observers and accuracy of the measurement of the tooth crown width of unerupted teeth using limited area cone beam X-ray CT.
3DX multi-image micro-CT (3DX, Morita Co., Kyoto, Japan) images of impacted supernumerary teeth in the median maxillary region taken prior to extraction were used for the samples. The width of the tooth on the 3DX image was measured five times by five individual observers. Significant differences in values among the observers in the measurement were determined by one-way analysis of variance for examining reproducibility. The measurement results of the ten samples on 3DX images were compared with the laboratory measurements using a three-dimensional co-ordinate measuring apparatus, using the Wilcoxon signed-rank sum test.
There was no significant difference among the observers in the measurement (P>0.05). The measurement results shown on 3DX images were significantly larger than those of the laboratory measurements (P<0.05). The mean difference was +0.088 mm.
3DX has high reproducibility for measuring the tooth crown width of unerupted teeth. While 3DX measurement values were larger than the laboratory measurements, the difference is clinically insignificant.
本研究旨在确定使用有限区域锥形束X线CT时，观察者之间测量未萌出牙牙冠宽度的可重复性及测量准确性。
将拔除前上颌正中区域埋伏多生牙的3DX多图像显微CT（3DX，日本京都森田公司）图像用作样本。由五名观察者对3DX图像上的牙齿宽度进行五次测量。通过单向方差分析确定观察者之间测量值的显著差异，以检验可重复性。使用威尔科克森符号秩和检验，将3DX图像上十个样本的测量结果与使用三维坐标测量仪的实验室测量结果进行比较。
观察者之间的测量无显著差异（P>0.05）。3DX图像上显示的测量结果显著大于实验室测量结果（P<0.05）。平均差值为+0.088毫米。
3DX在测量未萌出牙牙冠宽度方面具有较高的可重复性。虽然3DX测量值大于实验室测量值，但差异在临床上无显著意义。
