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External root resorption evaluated by CBCT 3D models superimposition.

Ana Beatriz N Pereira¹, Rhita Almeida¹, Flavia Artese¹

¹Universidade do Estado do Rio de Janeiro, Departamento de Ortodontia (Rio de Janeiro/RJ, Brazil).

Dental Press Journal of Orthodontics

|June 15, 2022

Summary

Orthodontic retraction after four premolar extractions showed a mild trend of external root resorption (ERR) in anterior teeth, but changes were not clinically significant and below CBCT accuracy.

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A Finite Element Approach for Locating the Center of Resistance of Maxillary Teeth

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Published on: April 8, 2020

Area of Science:

Dentistry
Orthodontics
Dental Imaging

Background:

External root resorption (ERR) is linked to orthodontic movement.
Anterior teeth are susceptible to ERR, especially after premolar extractions and retraction.

Purpose of the Study:

Assess root morphology changes in maxillary canines and incisors.
Evaluate root changes after four premolar extraction and anterior teeth retraction using 3D models.

Main Methods:

Utilized Cone Beam CT scans (T0 and T1) from six adult patients.
Constructed and superimposed 3D surface models to map root changes.
Analyzed root morphology in patients with bimaxillary protrusion undergoing premolar extraction and retraction.

Main Results:

Observed average root differences were near zero.
Extreme value changes were smaller than the Cone Beam CT accuracy.
No clinically significant root changes were detected.

Conclusions:

A mild trend of external root resorption was noted.
The observed resorption was not clinically significant.
Root changes were below the accuracy threshold of the CBCT technology.