Bhakdinaronk A, Manson-Hing L R
Oral Surg Oral Med Oral Pathol. 1981 Jan;51(1):100-7. doi: 10.1016/0030-4220(81)90132-8.
Evaluation of the effect of radiographic technique upon the prediction of tooth lengths for all major types of teeth indicated the following: 1. The paralleling technique using the Rinn XCP film holder, the paralleling technique using the hemostat with bite block, and the bisecting-the-angle technique using the Rinn XCP film holder were the most accurate systems. 2. There were no significant differences among the three most accurate techniques. 3. The paralleling technique using a 16-inch tube-to-patient distance was more accurate than the bisecting-the-angle technique using an 8-inch tube-to-patient distance. 4. A beam-guiding film holder produced a more accurate radiographic image than the other film holders used in the study. 5. For the buccal roots of maxillary molars, the bisecting-the-angle technique using the Rinn XCP film holder produced the least mean difference between radiographic image and tooth length. 6. The accuracy of predicting the length of mandibular molar teeth from the diagnostic radiograph was not affected by radiographic technique.
对所有主要类型牙齿的X线摄影技术在预测牙长方面的效果评估表明：1. 使用Rinn XCP胶片夹的平行投照技术、使用带咬块止血钳的平行投照技术以及使用Rinn XCP胶片夹的分角投照技术是最准确的系统。2. 三种最准确的技术之间没有显著差异。3. 使用16英寸管-患牙距离的平行投照技术比使用8英寸管-患牙距离的分角投照技术更准确。4. 导向束胶片夹产生的X线影像比研究中使用的其他胶片夹更准确。5. 对于上颌磨牙的颊根，使用Rinn XCP胶片夹的分角投照技术在X线影像与牙长之间产生的平均差异最小。6. 从诊断性X线片预测下颌磨牙牙长的准确性不受X线摄影技术的影响。
