Katona T R
Department of Orthodontics and Oral Facial Genetics, Indiana University School of Dentistry, Room DS250, 1121 West Michigan Street, Indianapolis, IN 46202, USA.
Dentomaxillofac Radiol. 2007 Sep;36(6):311-6. doi: 10.1259/dmfr/52061649.
The purpose of this project was to analyse the effects of X-ray source location on mathematical compensations used in the clinical assessment of external apical root resorption (EARR).
Using geometric constructions, governing equations were derived to express the relationships between actual tooth, root and crown lengths, and their image sizes on "before" and "after" radiographs.
Good agreement was found between calculated and published experimental results. More importantly, errors associated with the assessment methods are demonstrated.
It is established that root resorption assessment algorithms cannot reliably compensate for the inherent distortions in radiographic evaluations of EARR, even in the best-case scenario of an idealized, precisely characterized, linear tooth.
本项目旨在分析X射线源位置对根尖外吸收（EARR）临床评估中所使用数学补偿的影响。
通过几何构造，推导控制方程以表达实际牙齿、牙根和冠部长度与其在“治疗前”和“治疗后”X线片上的影像大小之间的关系。
计算结果与已发表的实验结果高度吻合。更重要的是，证明了与评估方法相关的误差。
已证实，即使在理想化、精确表征的线性牙齿这种最佳情况下，牙根吸收评估算法也无法可靠地补偿EARR影像学评估中固有的失真。
