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Related Experiment Videos

The relationship between lower incisor inclination and various reference lines.

M Corelius, S Linder-Aronson

    The Angle Orthodontist
    |April 1, 1976
    PubMed
    Summary

    Lower incisor inclination strongly correlates with cranial reference lines in children. Growth did not significantly alter this relationship, suggesting environmental factors like tongue and lip function play a role.

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    Area of Science:

    • Orthodontics and Craniofacial Development
    • Pediatric Dentistry
    • Cephalometric Analysis

    Background:

    • The inclination of lower incisors is a key factor in dental and skeletal relationships.
    • Understanding these relationships is crucial for diagnosing and treating malocclusions.
    • Growth and environmental factors can influence craniofacial development and incisor position.

    Purpose of the Study:

    • To investigate the correlation between lower incisor inclination and cranial reference lines in children.
    • To analyze how growth affects the relationship between lower incisor position and craniofacial variables.
    • To differentiate between topographical and biological influences on these relationships.

    Main Methods:

    • Cephalometric analysis of 60 children (ages 7-12) with initial and follow-up measurements over 3-4 years.

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  • Correlation analysis of variables including Ll-NB (mm), Ll-ML (degrees), Ll-NB (degrees), ANB (degrees), and ML/NL (degrees).
  • Statistical evaluation to distinguish topographical versus biological relationships and assess growth-related changes.

    • Main Results:

    • Strong correlations were found between lower incisor inclination (Ll-NB, Ll-ML, Ll-NB degrees) and basal bone relationships (ANB degrees).
    • The angle ML/NL correlated significantly only with lower incisor inclination to the mandibular line.
    • No significant correlation was observed between changes in lower incisor orientation and ML/NL angle changes during growth.

    Conclusions:

    • Lower incisor inclination is strongly associated with specific cranial and mandibular reference lines in growing children.
    • Environmental factors, such as tongue and lip function, appear to influence the stability of lower incisor position relative to the mandibular plane during growth.
    • These findings have implications for orthodontic diagnosis and treatment planning in pediatric patients.