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Related Experiment Videos

Apical root resorption due to mandibular first molar mesialization: A split-mouth study.

Jonas Winkler1, Nicolas Göllner1, Peter Göllner2

  • 1Department of Orthodontics and Dentofacial Orthopedics, University of Bern, Bern, Switzerland.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|April 3, 2017
PubMed
Summary

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Space closure in the mandible can cause external apical root resorption (EARR), particularly in mesialized molars. However, the observed EARR was not clinically significant.

Area of Science:

  • Orthodontics
  • Dental Radiology
  • Periodontology

Background:

  • External apical root resorption (EARR) is a potential complication of orthodontic treatment.
  • Unilateral second premolar agenesis necessitates space closure in the mandible, potentially impacting adjacent teeth.

Purpose of the Study:

  • To evaluate the risk of EARR in mesialized mandibular molars during space closure.
  • To compare EARR on the space closure side versus the contralateral control side.

Main Methods:

  • Retrospective analysis of 25 subjects with unilateral second premolar agenesis.
  • Space closure (approx. 10 mm) achieved using skeletal anchorage.
  • EARR measured on pretreatment and posttreatment panoramic radiographs of canines, premolars, and molars.

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Main Results:

  • No significant EARR difference was found in canines and premolars between sides.
  • A statistically significant difference in EARR was observed in mesialized molars (0.73 mm).
  • Mean total EARR for all tooth types did not exceed 1 mm.

Conclusions:

  • Mandibular space closure involving significant tooth movement is a risk factor for EARR.
  • The overall amount of EARR was not considered clinically significant.