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Analysis of orthodontically induced root resorption using micro-computed tomography (Micro-CT).

Tom Wierzbicki¹, Tarek El-Bialy, Saleh Aldaghreer

¹University of Alberta, Edmonton, Alberta, Canada.

The Angle Orthodontist

|January 7, 2009

Summary

Orthodontic treatment significantly increases tooth root resorption in human premolars. This study establishes a micro-CT protocol to quantify orthodontically induced tooth root resorption (OITRR) and predict further damage.

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Area of Science:

Dental research
Orthodontics
Biomaterials science

Background:

Tooth root resorption is a common complication of orthodontic treatment.
Accurate assessment of resorption is crucial for patient care and treatment planning.

Purpose of the Study:

To develop and validate a micro-computed tomography (micro-CT) protocol for quantifying orthodontically induced tooth root resorption (OITRR).
To investigate the relationship between OITRR and dentin demineralization.

Main Methods:

Utilized micro-CT to analyze ten extracted human premolars from adolescent patients.
Compared premolars subjected to 1 year of orthodontic treatment with those not treated.
Measured resorption lacunae parameters (number, volume, depth, extension) and dentin demineralization.

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Main Results:

Orthodontic treatment led to significantly increased resorption lacunae volume, number, depth, and coronoapical extension.
Demineralization of dentin was observed subjacent to resorption lacunae in treated teeth.

Conclusions:

A reliable micro-CT protocol for quantitative OITRR assessment has been established.
Dentin demineralization can serve as a predictor for future tooth root resorption during orthodontic therapy.