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Related Experiment Video

Updated: Jan 20, 2026

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Two distalization methods compared in a novel patient-specific finite element analysis.

Makram J Ammoury1, Samir Mustapha2, Paul C Dechow3

  • 1Division of Orthodontics and Dentofacial Orthopedics, American University of Beirut Medical Center, Beirut, Lebanon.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|September 3, 2019
PubMed
Summary

Cortical bone stiffness, not thickness, significantly impacts tooth movement during orthodontic mini-implant distalization. This finding has important clinical implications for orthodontics.

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Area of Science:

  • Orthodontics
  • Biomechanical Engineering
  • Dental Anatomy

Background:

  • Orthodontic mini-implants enable tooth movement through direct or indirect anchorage.
  • Understanding stress distribution on the periodontal ligament (PDL) is crucial for effective treatment.
  • Individual variations in maxillary anatomy and bone properties influence biomechanical responses.

Purpose of the Study:

  • To compare stress levels on the PDL of maxillary buccal teeth during direct and indirect distalization using mini-implants.
  • To investigate the influence of individual variations in maxillary bone stiffness and thickness on these stress levels.

Main Methods:

  • A 3D finite element model of the maxilla was created from CT scans.
  • Cortical bone properties (stiffness, thickness) were individualized using cadaver data.
  • Simulations of direct and indirect distalization modalities were performed.

Main Results:

  • Stress distribution varied significantly between adjacent teeth based on bone stiffness, but not thickness.
  • Cortical bone thickness showed minimal correlation with stress values during distalization.
  • Cortical bone stiffness demonstrated a strong, inverse correlation with stress levels, particularly at the first molar.

Conclusions:

  • Cortical bone stiffness plays a more significant role in modulating tooth movement than bone thickness.
  • These findings suggest personalized approaches to orthodontic treatment planning may be beneficial.
  • The study highlights the importance of considering individual bone biomechanics in orthodontic therapy.