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Related Experiment Videos

Computer simulation of occlusal discrepancies resulting from different mounting techniques

E Piehslinger1, W Bauer, H B Schmiedmayer

  • 1Department of Fixed and Removal Prosthodontics, University of Vienna, Austria.

The Journal of Prosthetic Dentistry
|September 1, 1995
PubMed
Summary

Arbitrary facebow mounting significantly deviates from the precise hinge axis in most cases, leading to occlusal errors. These errors, influenced by axis shifts and record height, can necessitate extensive occlusal adjustments.

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Area of Science:

  • Dental Articulation
  • Occlusal Analysis
  • Prosthodontics

Background:

  • Accurate mounting of maxillary casts on articulators is crucial for reproducible occlusal analysis.
  • Arbitrary mounting methods may introduce inaccuracies compared to kinematic facebow transfers.

Purpose of the Study:

  • To evaluate the accuracy of arbitrary facebow mounting compared to hinge axis mounting.
  • To quantify the occlusal errors resulting from arbitrary mounting of maxillary casts.

Main Methods:

  • Maxillary casts from 31 volunteers were mounted using arbitrary and hinge bows.
  • Three reference points were measured using a 3D digitizer.
  • Computer simulation analyzed opening/closing movements based on reference point measurements.

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Main Results:

  • Arbitrary facebow mounting deviated from the precise hinge axis by over 5 mm in 77% of cases.
  • Occlusal errors were proportional to hinge axis shifts/tilts and record height.
  • A record height of ≥2 mm resulted in >0.1 mm occlusal error.

Conclusions:

  • Arbitrary facebows introduce significant inaccuracies in maxillary cast mounting.
  • These inaccuracies can lead to substantial occlusal errors, potentially requiring extensive clinical adjustments.