Duinkerke A S, Van de Poel A C, Purdell-Lewis D J, Doesburg W H
Oral Surg Oral Med Oral Pathol. 1986 Nov;62(5):603-6. doi: 10.1016/0030-4220(86)90327-0.
The reproducibility of estimations of the alveolar crest height based on their relationship to two other fixed points on the tooth has been analyzed in a study of 302 routine periapical radiographs of 96 endodontically treated teeth. The radiographs were made at normal recall appointments by use of the extension tube paralleling technique. The various distances between four fixed points on each tooth in any radiographic series were compared by means of a statistical model. The results indicate that, in periodontal follow-up studies, completely standardized projection of the structures onto the film is unnecessary since measurements of the crest height can be related to any suitable fixed measuring standard on the tooth.
在一项对96颗经牙髓治疗牙齿的302张常规根尖片的研究中，分析了基于牙槽嵴高度与牙齿上其他两个固定点的关系进行测量的可重复性。这些根尖片是在正常复诊时使用延长管平行投照技术拍摄的。通过统计模型比较了任何一个X线片序列中每颗牙齿上四个固定点之间的各种距离。结果表明，在牙周随访研究中，无需将结构完全标准化地投影到胶片上，因为牙槽嵴高度的测量可以与牙齿上任何合适的固定测量标准相关联。
