Chau A C M, Li T K L, Wong J
Oral Radiology, The Prince Philip Dental Hospital, 34 Hospital Road, Sai Ying Pun, Hong Kong.
Dentomaxillofac Radiol. 2006 May;35(3):200-4. doi: 10.1259/dmfr/84342351.
To assess the effect of a laser-guided collimator in intraoral radiography training.
A custom-made collimator with four red laser diodes on each corner on the rim of an aluminium alloy cubic housing was fabricated. The laser used low power diodes, which are classified as laser-safe by the United States Food and Drug Administration (FDA). When activated, the effective dimensions of the laser beams were 4 cm x 4.5 cm. Eighteen dental hygiene students were randomized into test and control groups. The Laser group used a rectangular collimator with the laser device, while the Non-laser group used a conventional rectangular collimator. Each group attended nine intraoral radiography training sessions. All radiographs were assessed and were classified into three categories: Excellent, Acceptable and Repeat, by a masked academic staff member. Reasons for repeats were marked. Statistical comparisons between the two groups were made.
A total of 2334 radiographs were made. Conecut was more common on bitewings than periapicals. The Laser group produced fewer conecuts than the Non-laser group. The Laser group produced more excellent radiographs with fewer repeats than the Non-laser group, but there was not a significant difference.
The laser-guided collimator helped the students to produce fewer repeats in a shorter period of time. It was an effective training aid.
评估激光导向准直器在口腔内放射摄影训练中的效果。
制作了一种定制的准直器，在铝合金立方体外壳边缘的每个角上有四个红色激光二极管。该激光使用低功率二极管，被美国食品药品监督管理局（FDA）归类为激光安全型。激活后，激光束的有效尺寸为4厘米×4.5厘米。18名口腔卫生专业学生被随机分为测试组和对照组。激光组使用带有激光装置的矩形准直器，而非激光组使用传统的矩形准直器。每组参加九次口腔内放射摄影训练课程。所有的X线片均由一名不知情的学术人员进行评估，并分为三类：优秀、可接受和需重复拍摄，标记出需重复拍摄的原因，并对两组进行统计学比较。
共拍摄了2334张X线片。咬合翼片上的锥形切割比根尖片上更常见。激光组产生的锥形切割比非激光组少。激光组比非激光组产生更多优秀的X线片且重复拍摄次数更少，但差异不显著。
激光导向准直器帮助学生在更短的时间内减少重复拍摄次数，是一种有效的训练辅助工具。
