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

Area of Science:

• Dentistry
• Radiology
• Biomedical Engineering

Background:

• External apical root resorption (EARR) is a common complication of orthodontic treatment.
• Accurate assessment of EARR is crucial for treatment planning and monitoring.
• Radiographic methods are widely used for EARR assessment but are subject to distortions.

Purpose of the Study:

• To analyze the impact of X-ray source location on mathematical compensations used in clinical EARR assessment.
• To evaluate the reliability of current algorithms in correcting radiographic distortions.

Main Methods:

• Derivation of governing equations using geometric constructions.
• Modeling the relationship between actual tooth dimensions and radiographic image sizes.
• Analysis of "before" and "after" radiographic data.

Main Results:

• Calculated results showed good agreement with published experimental findings.
• Demonstrated significant errors associated with current EARR assessment methods.
• Highlighted the influence of X-ray source position on measurement accuracy.

Conclusions:

• Root resorption assessment algorithms cannot reliably compensate for radiographic distortions in EARR evaluation.
• Even in idealized scenarios, inherent distortions limit the precision of EARR assessment.
• X-ray source location is a critical factor influencing the accuracy of EARR measurements.