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Related Experiment Videos

Reliability of an ear-bow arbitrary face-bow transfer instrument.

D G Choi1, J F Bowley, D B Marx

  • 1Department of Prosthodontics, Kyung-Hee University, College of Dentistry, Dongdaemoon-Gu, Seoul, Korea. choi@nms.kyunghee.ac.kr

The Journal of Prosthetic Dentistry
|July 29, 1999
PubMed
Summary

Dentists using arbitrary ear-face-bow instruments may encounter up to +/-1.2 mm of error when mounting maxillary casts. Operator variability did not significantly affect vertical or horizontal orientation but impacted posterior measurements.

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Area of Science:

  • Dental prosthodontics
  • Biomechanical analysis

Background:

  • Maxillary arch orientation to temporomandibular joint articulation is critical.
  • Operator and equipment variability can introduce technical errors in dental procedures.

Purpose of the Study:

  • To assess the variability among dentists using an arbitrary ear-face-bow instrument for maxillary cast mounting.
  • To quantify potential errors in spatial orientation during the mounting process.

Main Methods:

  • A single maxillary cast was mounted by three dentists using a common arbitrary ear-face-bow instrument.
  • Coordinate measurements with a machinist's microscope tracked spatial orientation changes at four reference points.
  • Repeated measures ANOVA and Wilks' Lambda test analyzed spatial orientation variations.

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Main Results:

  • A 95% confidence interval indicated a potential error range of +/-1.2 mm for dentists using this instrument/articulator combination.
  • No significant differences in vertical or horizontal spatial orientation were found among the dentists.
  • Statistically significant differences were observed in linear distance changes on the patient's posterior right side.

Conclusions:

  • The study identified a range of inherent error attributable to the operator when using this specific ear-face-bow instrument.
  • Operator variability influences specific spatial measurements, particularly on the posterior aspect.