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Factors associated with mandibular third molar eruption and impaction.

Hung-Huey Tsai1

  • 1College of Oral Medicine, Taipei Medical University, School of Dentistry, China Medical University. hunghuey@tmu.edu.tw

The Journal of Clinical Pediatric Dentistry
|February 24, 2006
PubMed
Summary

Mandibular third molar impaction in Taiwanese adults is linked to reduced space between the second molar and ramus, and tooth size. These factors are key predictors of eruption issues.

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Area of Science:

  • Dentistry
  • Oral and Maxillofacial Surgery
  • Orthodontics

Background:

  • Mandibular third molar (wisdom tooth) impaction is a common clinical issue.
  • Understanding factors influencing impaction is crucial for diagnosis and treatment planning.

Purpose of the Study:

  • To investigate the radiographic predictors of mandibular third molar eruption and impaction in a Taiwanese population.
  • To identify key anatomical and dental variables differentiating impacted from non-impacted third molars.

Main Methods:

  • Retrospective analysis of panoramic radiographs from 152 Taiwanese individuals (72 males, 80 females).
  • Measurements included tooth dimensions, jaw morphology (ramus and body), and spatial relationships (molar-ramus space).
  • Multivariate discriminatory analysis was used to compare impaction and non-impaction groups.

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Main Results:

  • Significant differences were observed between impacted and non-impacted mandibular third molars.
  • Reduced space between the distal surface of the mandibular second molar and the anterior ramus, along with tooth size, were primary discriminatory variables.
  • Jaw morphology and angles showed some differences but were less significant predictors.

Conclusions:

  • Radiographic measurements of interarch space and tooth size are critical for predicting mandibular third molar impaction.
  • These findings can aid clinicians in assessing impaction risk and planning interventions.