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Related Experiment Videos

Dental morphology and crowding. A multivariate approach.

Eduardo Bernabé1, Carlos Flores-Mir

  • 1Associate Professor, Department of Social Dentistry, Universidad Peruana Cayetano Heredia, Lima, Peru.

The Angle Orthodontist
|February 2, 2006
PubMed
Summary

Tooth size and crown proportions, specifically mesiodistal (MD) measurements, significantly differ across dental arches with varying degrees of crowding. These odontometric variations contribute to understanding the complex origins of dental crowding.

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Area of Science:

  • Orthodontics
  • Dental Anthropology

Background:

  • Dental crowding is a common condition with multifactorial origins.
  • Understanding the role of tooth size and proportion is crucial for diagnosis and treatment planning.

Purpose of the Study:

  • To compare mesiodistal (MD) and buccolingual (BL) tooth sizes and crown proportions in permanent dentition across different crowding levels.
  • To investigate the odontometric differences in dental arches with moderate, mild, and no crowding.

Main Methods:

  • Dental casts from 200 adolescents (12-16 years) in Lima, Peru, were analyzed.
  • MD and BL tooth sizes and MD/BL crown proportions were measured for permanent teeth (excluding second and third molars).
  • Multivariate analysis of variance (MANOVA) was used to compare tooth size and proportion data among crowding groups.

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Main Results:

  • Combined MD tooth sizes and crown proportions differed significantly among crowding groups.
  • Individual tooth analyses revealed significant differences in MD tooth size for all upper teeth and specific lower teeth (premolars, central incisors).
  • Crown proportions also showed significant differences in several upper and lower teeth, while BL tooth sizes did not differ across groups.

Conclusions:

  • Mesiodistal tooth dimensions and crown proportions are significant differentiating factors between dental arches with varying degrees of crowding.
  • These findings contribute to the understanding of the odontometric component in the multifactorial etiology of dental crowding.