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Related Experiment Videos

Maxillary incisor crown-root relationships in different angle malocclusions

E F Harris1, S Hassankiadeh, J T Harris

  • 1Postgraduate Orthodontics, School of Dental Medicine, SUNY, Stony Brook.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|January 1, 1993
PubMed
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Maxillary incisor crowns often deviate from their root axis, especially in Class III malocclusions. This crown-root angle variation is linked to eruption mechanics, not root resorption during orthodontic treatment.

Area of Science:

  • Orthodontics
  • Dental Anatomy
  • Craniofacial Development

Background:

  • The long axis of the maxillary incisor root and crown are not always aligned.
  • Crown-root angle variations, typically with the crown lingual to the root axis, are common.
  • Understanding these variations is crucial for orthodontic diagnosis and treatment planning.

Purpose of the Study:

  • To investigate the crown-root angle of maxillary incisors in orthodontic patients.
  • To assess the association between crown-root angle and Class III molar relationships.
  • To identify cephalometric predictors of crown-root angle deflection and its relation to root resorption.

Main Methods:

  • Analysis of cephalometric radiographs from orthodontic patients before and after full-banded treatment.

Related Experiment Videos

  • Measurement of the crown-root angle and assessment of Class III molar relationships.
  • Correlation of crown-root angle with intertooth relationships (overjet, interincisal angle) and apical root resorption.

    • Main Results:

    • Significant deflection of the crown-root angle was observed in Class III molar relationships, particularly in moderate to severe cases.
    • Maxillary incisors in Class III cases showed crowns torqued lingual to the root axis.
    • Apical root resorption was not significantly associated with the crown-root angle, either before or after orthodontic treatment.

    Conclusions:

    • The deflection in the crown-root axis in Class III cases appears to develop during tooth eruption, possibly due to maxillary incisors being trapped within the lower arch.
    • Intertooth relationships, such as overjet and interincisal angle, are cephalometric predictors of crown-root axis deflection.
    • The findings suggest that crown-root angle variations in Class III malocclusions are primarily an eruptive phenomenon rather than a direct consequence of orthodontic forces causing root resorption.