Iikubo Masahiro, Kobayashi Kaoru, Mishima Akira, Shimoda Shinji, Daimaruya Takayoshi, Igarashi Chinami, Imanaka Masahiro, Yuasa Masao, Sakamoto Maya, Sasano Takashi
Department of Oral Diagnosis, Tohoku University Graduate School of Dentistry, Sendai, Japan.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009 Nov;108(5):e70-4. doi: 10.1016/j.tripleo.2009.07.009.
The accuracies of intraoral radiography (IOR), multidetector helical computerized tomography (MDHCT) at slice thicknesses 0.63 mm and 1.25 mm, and limited cone-beam computerized tomography (LCBCT) were compared for detection of horizontal tooth root fracture.
In 7 beagle dogs, 28 maxillary anterior teeth were used, of which 13 had artificially induced horizontal root fracture. The specimens were examined by the above-mentioned 4 modalities. Diagnosis of root fracture was based on direct visualization of radiolucent line in each image by 6 radiologists.
Sensitivity, negative predictive value, and diagnostic accuracy (true positives + true negatives) for detecting fracture lines in LCBCT (0.96 +/- 0.04, 0.97 +/- 0.03, 0.93 +/- 0.04, respectively) were significantly higher than MDHCT at 0.63 mm (0.76 +/- 0.09, 0.8 +/- 0.05, 0.8 +/- 0.05, respectively), MDHCT at 1.25 mm (0.49 +/- 0.09, 0.66 +/- 0.04, 0.69 +/- 0.05, respectively), and IOR (0.51 +/- 0.18, 0.67 +/- 0.08, 0.69 +/- 0.08, respectively). Specificity and positive predictive value showed no significant intermethod difference among the 4 modalities.
Limited cone-beam CT is more useful than the other 3 radiographic modalities for diagnostic imaging of horizontal tooth root fracture.
比较口腔内放射摄影（IOR）、层厚为0.63mm和1.25mm的多排螺旋计算机断层扫描（MDHCT）以及有限锥束计算机断层扫描（LCBCT）检测水平牙根骨折的准确性。
选用7只比格犬的28颗上颌前牙，其中13颗人为造成水平牙根骨折。采用上述4种方法对标本进行检查。6名放射科医生通过直接观察每张图像中的透光线来诊断牙根骨折。
LCBCT检测骨折线的灵敏度、阴性预测值和诊断准确性（真阳性+真阴性）（分别为0.96±0.04、0.97±0.03、0.93±0.04）显著高于层厚0.63mm的MDHCT（分别为0.76±0.09、0.8±0.05、0.8±0.05）、层厚1.25mm的MDHCT（分别为0.49±0.09、0.66±0.04、0.69±0.05）和IOR（分别为0.51±0.18、0.67±0.08、0.69±0.08）。4种方法之间的特异性和阳性预测值没有显著差异。
对于水平牙根骨折的诊断成像，有限锥束CT比其他3种放射成像方法更有用。
