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Related Experiment Videos

Comparison study of elastic impression material.

J L Drummond, R G Randolph

    The Journal of Prosthetic Dentistry
    |August 1, 1986
    PubMed
    Summary
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    Master castings seat more accurately on casts from MOD impressions compared to full crown impressions. Pour time significantly impacts clinical acceptability of dental impressions.

    Area of Science:

    • Dental Materials Science
    • Prosthodontics
    • Impression Techniques

    Background:

    • Accurate master castings are crucial for successful dental prostheses.
    • Elastic impression materials are widely used in restorative dentistry.
    • The influence of impression technique on casting accuracy requires further investigation.

    Purpose of the Study:

    • To compare the seating accuracy of master castings from two different impression types: MOD (Mutilated-Occlusal-Distal) and full crown.
    • To evaluate the clinical acceptability of casts produced using elastic impression materials.
    • To determine the effect of impression pour time on casting accuracy and clinical outcomes.

    Main Methods:

    • Four different elastic impression materials were tested.

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  • Master castings were fabricated from impressions of MOD preparations and full crown preparations.
  • Seating accuracy of castings was measured.
  • Clinical acceptability was assessed.
  • Impression pour time was systematically varied.

    • Main Results:

    • Master castings demonstrated higher seating accuracy on casts derived from MOD impressions versus full crown impressions.
    • A notable difference was observed between statistical identity and clinical acceptance.
    • Altering the pour time resulted in a spectrum of outcomes, ranging from clinically acceptable to unacceptable.

    Conclusions:

    • MOD impressions may yield more accurate master castings than full crown impressions.
    • Clinical evaluation is essential to determine the true success of dental impressions beyond statistical measures.
    • Impression pour time is a critical variable that significantly influences the clinical utility of dental casts.