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Computer-generated study of the correlation between tooth, face, arch forms, and palatal contour

P N Sellen1, D C Jagger, A Harrison

  • 1Department of Oral and Dental Science, Bristol Dental School and Hospital, United Kingdom.

The Journal of Prosthetic Dentistry
|August 26, 1998
PubMed
Summary

This study found no significant correlation between facial form, dental arch form, and tooth shape. Advanced computer analysis did not improve artificial tooth selection accuracy for edentulous patients, proving impractical for general use.

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Area of Science:

  • Dentistry
  • Biometrics
  • Computer-aided analysis

Background:

  • Establishing reliable esthetic factors for artificial tooth selection remains challenging.
  • No single esthetic factor is universally accepted for guiding artificial tooth form selection.

Purpose of the Study:

  • To introduce a novel computer-assisted method for analyzing facial form, arch form, palatal contour, and tooth shape.
  • To investigate correlations between these esthetic factors.

Main Methods:

  • Utilized irreversible hydrocolloid impressions from 50 dental students for maxillary dentition casts.
  • Employed standardized photography for facial and dental arch/tooth shape records.
  • Developed a computer program for superimposing and correlating esthetic factors.

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Main Results:

  • Low correspondence (22%) between tooth and face form; higher between arch and face form (28%).
  • Arch form showed the highest correspondence with face form, followed by tooth form.
  • Gender-based analysis indicated men favored tapering tooth classes, women favored square and ovoid classes.

Conclusions:

  • Superimposition revealed insignificant correlations between face, tooth, and arch forms.
  • High-technology method did not enhance accuracy for selecting artificial teeth in edentulous patients.
  • Method's cost and complexity limit its practical application in routine dental practice.