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Related Experiment Videos

Variations in bridge construction in commercial laboratories.

A Johnson1, R B Winstanley, S E Northeast

  • 1Department of Restorative Dentistry, University of Sheffield School of Clinical Dentistry, Charles Clifford Dental Hospital.

Restorative Dentistry
|August 1, 1991
PubMed
Summary

Dental laboratories showed significant variation in constructing porcelain bonded to metal bridges. Inconsistent prescriptions likely contributed to these quality differences in fixed bridge restorations.

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Area of Science:

  • Dental materials science
  • Prosthodontics
  • Dental laboratory technology

Background:

  • Porcelain bonded to metal (PBM) bridges are common fixed dental prostheses.
  • Quality control in dental laboratory services is crucial for patient outcomes.
  • Variability in PBM bridge fabrication can impact clinical success and patient satisfaction.

Purpose of the Study:

  • To assess the quality and consistency of PBM three-unit fixed bridges produced by commercial dental laboratories in the UK.
  • To identify potential factors contributing to variations in bridge quality.

Main Methods:

  • Identical working models for a PBM three-unit fixed bridge were sent to 30 UK dental laboratories.
  • Bridges were fabricated and returned for examination.

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  • Acceptability was evaluated using subjective clinical and technical criteria.

    • Main Results:

    • A wide variation in the quality and acceptability of the fabricated PBM bridges was observed.
    • Significant inconsistencies were noted between bridges produced by different laboratories.
    • The quality of the prescription provided to the laboratories was identified as a potential contributing factor.

    Conclusions:

    • Commercial dental laboratories exhibit considerable variability in PBM bridge fabrication.
    • The use of standardized and comprehensive laboratory prescriptions is essential to improve consistency and quality.
    • Further investigation into prescription adequacy and laboratory quality assurance is warranted.