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Related Experiment Videos

Reproducibility of the centric relation bite registration technique

D P Wood1, R W Elliott

  • 1Faculty of Dentistry University of Western Ontario London, Canada.

The Angle Orthodontist
|January 1, 1994
PubMed
Summary

The Roth centric relation (CR) bite registration technique is highly reproducible for mounting dental casts. This method accurately reveals differences in malocclusion compared to maximum intercuspation (MI), aiding orthodontic diagnosis.

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Area of Science:

  • Orthodontics
  • Dental Occlusion
  • Diagnostic Casts

Background:

  • Orthodontists utilize diagnostic casts mounted in centric relation (CR) to identify malocclusions distinct from those observed in maximum intercuspation (MI).
  • The CR to MI slide, measurable via semi-adjustable articulators and condylar position indicator devices (CPI), requires validation before treatment planning.

Purpose of the Study:

  • To assess the reproducibility of the Roth two-piece wax CR bite registration technique using CPI.
  • To determine the direction of the centric slide from CR to MI.
  • To quantify differences in overjet between CR and MI and identify initial tooth contacts in CR.

Main Methods:

  • Investigated 39 subjects, measuring condylar displacements (vertical and horizontal) using mounted models and a CPI.

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  • The Roth CR bite registration technique was repeated five times for each subject to assess reproducibility.
  • Recorded data included condylar movement, overjet measurements, and initial tooth contact locations.

    • Main Results:

    • The Roth CR bite registration technique demonstrated high reproducibility, with no significant differences found between five repeated CPI readings (p > .05).
    • The centric slide from CR to MI showed an inferior and slightly distal condylar movement.
    • A statistically significant difference (p < .001) in overjet measurements was observed between CR and MI.
    • Initial tooth contacts in CR were predominantly on the most posterior teeth in 36 out of 39 subjects.

    Conclusions:

    • The Roth CR bite registration technique is a reliable method for mounting diagnostic casts in centric relation.
    • Utilizing CR mounting reveals significant differences in malocclusion and overjet compared to MI.
    • This validated technique enhances diagnostic accuracy for orthodontic treatment planning.