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Mandibular posterior anatomic limit for molar distalization.

Sung-Jin Kim1, Tae-Hyun Choi1, Hyoung-Seon Baik2

  • 1Lecturer, Department of Orthodontics, School of Dentistry, Yonsei University, Seoul, Korea.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|August 3, 2014
PubMed
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The mandibular posterior anatomic limit for molar distalization is the lingual cortex. Three-dimensional computed tomography scans are recommended for accurate assessment of posterior available space and potential root contact.

Area of Science:

  • Orthodontics
  • Dental Anatomy
  • Radiology

Background:

  • Molar distalization is a common orthodontic procedure.
  • Determining the posterior anatomic limit is crucial for successful treatment.
  • Understanding the available space is essential to prevent complications.

Purpose of the Study:

  • To investigate the mandibular posterior anatomic limit for molar distalization.
  • To compare posterior available space at crown and root levels.
  • To evaluate the accuracy of lateral cephalograms in predicting this space.

Main Methods:

  • 3D computed tomography (CT) scans of 34 adults were analyzed.
  • Posterior available space was measured at crown and root levels.
  • Measurements from lateral cephalograms were compared to CT data.

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Main Results:

  • Posterior available space was significantly smaller at the root level than the crown level.
  • Root contact with the lingual cortex occurred in 35.3% of roots.
  • Lateral cephalograms predicted actual space with R²=0.261 and identified root contact in 66.2% of cases.

Conclusions:

  • The lingual cortex of the mandibular body represents the posterior anatomic limit.
  • CT scans are recommended for patients needing significant molar distalization.
  • Accurate assessment of posterior space is vital to avoid complications.