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Related Experiment Videos

Triangular-shaped incisor crowns and crowding.

S H Rhee1, D S Nahm

  • 1Department of Dentistry, Ajou University, School of Medicine, Suwon, 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
|December 13, 2000
PubMed
Summary
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The shape of incisor crowns correlates with dental crowding. Narrower cervical and wider incisal areas in incisors indicate crowding, aiding diagnosis and treatment planning.

Area of Science:

  • Dentistry
  • Orthodontics
  • Dental Morphology

Background:

  • Dental crowding is a common malocclusion.
  • Understanding the relationship between tooth shape and crowding is crucial for diagnosis.
  • Previous research has explored various factors contributing to malocclusion.

Purpose of the Study:

  • To investigate the correlation between labial crown shape of incisors and dental crowding.
  • To determine if specific incisor dimensions can predict or indicate crowding.
  • To assess the diagnostic utility of incisor shape in malocclusion.

Main Methods:

  • Analysis of plaster dental casts from 69 untreated individuals.
  • Classification of participants into crowded and normal groups using Little's irregularity index.

Related Experiment Videos

  • Measurement of mesiodistal widths of incisal and cervical areas of incisors using a digital vernier caliper.
  • Calculation of the incisor width ratio and correlation with irregularity index.

    • Main Results:

    • The crowded group exhibited significantly larger incisal areas (P <.01) and smaller cervical areas (P <.01) compared to the normal group.
    • The incisor width ratio showed a significant correlation with the irregularity index (Pearson r(2) from 55% to 65%).
    • Distinct dimensional differences in incisor labial crowns were observed between crowded and non-crowded individuals.

    Conclusions:

    • Incisor labial crown shape, specifically the ratio of incisal to cervical width, is significantly correlated with dental crowding.
    • This incisor width ratio can serve as a valuable diagnostic tool for identifying and managing crowded malocclusions.
    • The findings support the use of dental morphology in orthodontic diagnosis and treatment planning.