Objectives: 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). Methods: 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. Results: Good agreement was found between calculated and published experimental results. More importantly, errors associated with the assessment methods are demonstrated. Conclusion: 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.
- Root resorption
ASJC Scopus subject areas
- Radiology Nuclear Medicine and imaging