The flaws in tooth root resorption assessment algorithms: The role of source position

Research output: Contribution to journalArticle

6 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)311-316
Number of pages6
JournalDentomaxillofacial Radiology
Issue number6
StatePublished - Sep 1 2007



  • Radiography
  • Root resorption

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Radiology Nuclear Medicine and imaging
  • Dentistry(all)

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