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Mandibular first molar relation to variable lower face skeletal components.

Louis Matthew Andria1, Luis Paulo Leite, April M Dunlap

  • 1Medical University of South Carolina, Pediatric Dentistry and Orthodontics, Charleston, SC 29425, USA. louandria@nuvox.net

The Angle Orthodontist
|October 13, 2006
PubMed
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The position of the mandibular first permanent molar is influenced by patient age and facial structure. Older patients and those with longer mandibles or greater posterior facial height have a more forward molar position.

Area of Science:

  • Orthodontics and Dental Anatomy

Background:

  • The precise positioning of the mandibular first permanent molar is crucial for dental arch development and occlusion.
  • Understanding factors influencing this position can aid in orthodontic diagnosis and treatment planning.

Purpose of the Study:

  • To investigate the relationship between the sagittal position of the mandibular first permanent molar and various patient-specific factors.

Main Methods:

  • 185 untreated Class I and Class II patients were analyzed.
  • Measurements included the interjaw angle, mandibular plane, and facial dimensions relative to the Frankfort horizontal.
  • Pearson correlation coefficients assessed the impact of age, cranial length, and mandibular dimensions on molar position.

Main Results:

  • Positive correlations were found between molar position and increasing age, mandibular body length, and posterior facial height.

Related Experiment Videos

  • Negative correlations indicated a more posterior molar position with increasing interjaw angle, mandibular plane angle, and ramal inclination.

    • Conclusions:

    • The mandibular first permanent molar's anterior position is associated with older age, longer mandibular bodies, and greater posterior facial height.
    • An acute interjaw angle also correlates with a more anterior molar position, while increased ramus forward tip positions the molar posteriorly.