Department of Oral Medicine and Oral Surgery, Jordan University of Science and Technology, Irbid, Jordan.
Department of Preventive Dentistry, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan.
Indian J Dent Res. 2020 Nov-Dec;31(6):883-887. doi: 10.4103/ijdr.IJDR_420_19.
The aim of this study was to assess the visibility of mandibular canal (MC) on cone beam CT (CBCT) images using a medical review monitor under two different calibration modes. The effect of age, gender, and location of the dental implant site was also assessed.
CBCT images of 428 dental implant sites were selected for the study. Images were displayed twice on a medical review monitor using two different calibration modes: standard and DICOM, and two observers evaluated the visibility of the MC using four-point scoring scale (1-4, poor to excellent). Cohen Kappa was used to assess intra and inter-rater reliability. Chi-square test was used to compare proportions of MC visibility by gender and location and one-way ANOVA was used to compare mean age and MC visibility.
Each observer classified the visibility of MC with a total agreement of 100% between DICOM mode and standard mode (Kappa = 1, P < 0.001 for each observer). In each mode, a strong agreement (inter-rater reliability) was detected between the observers (Cohen's kappa = 0.88 for both modes, P < 0.001) with a percent agreement of 95.3% for each mode. Gender and location were not statistically associated with MC visibility (P > 0.05). Age, however, was a significant predictor of MC visibility (P < 0.05).
DICOM calibration had no added value over standard calibration for assessing the visibility of MC at dental implant sites on a medical review monitor. Only the age had significant effect on the visibility.
本研究旨在评估两种不同校准模式下，使用医疗审查监视器在锥形束 CT（CBCT）图像上观察下颌管（MC）的可视性。还评估了年龄、性别和牙种植部位位置的影响。
本研究选择了 428 个牙种植部位的 CBCT 图像。使用两种不同的校准模式（标准和 DICOM），在医疗审查监视器上两次显示图像，两名观察者使用四分制评分量表（1-4，差到优）评估 MC 的可视性。使用 Cohen Kappa 评估组内和组间可靠性。使用卡方检验比较性别和位置对 MC 可视性的比例，使用单向方差分析比较平均年龄和 MC 可视性。
每位观察者在 DICOM 模式和标准模式之间的 MC 可视性分类中总一致性为 100%（每位观察者 Kappa = 1，P < 0.001）。在每种模式下，观察者之间均存在强烈一致（组内可靠性）（两种模式的 Cohen's kappa = 0.88，P < 0.001），每种模式的一致性百分比为 95.3%。性别和位置与 MC 可视性无统计学关联（P > 0.05）。然而，年龄是 MC 可视性的重要预测因素（P < 0.05）。
在医疗审查监视器上评估牙种植部位 MC 的可视性时，DICOM 校准模式并没有比标准校准模式提供更多价值。只有年龄对可视性有显著影响。
