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Temperature and dimensional changes in the two-stage processing technique for complete dentures

K C Yeung1, T W Chow, R K Clark

  • 1Prosthetic Dentistry, Prince Philip Dental Hospital, University of Hong Kong.

Journal of Dentistry
|August 1, 1995
PubMed
Summary
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The two-stage processing technique for complete dentures showed minimal temperature changes and less than 1% linear shrinkage. These findings suggest this method is clinically insignificant for denture warpage.

Area of Science:

  • Dental Materials Science
  • Polymer Chemistry

Background:

  • Complete dentures rely on heat-cured acrylic resin for fabrication.
  • The two-stage processing technique is an alternative method for denture fabrication.
  • Understanding dimensional stability and temperature changes is crucial for denture integrity.

Purpose of the Study:

  • To investigate the temperature fluctuations during the two-stage processing of heat-cured acrylic resin.
  • To measure the linear dimensional changes of the denture base using this technique.
  • To assess the clinical significance of these changes in relation to denture warpage.

Main Methods:

  • Thermocouples were embedded within the acrylic resin to monitor temperature changes.
  • A high-resolution digital measuring microscope was used to record linear dimensional changes.

Related Experiment Videos

  • The study involved two processing cycles for complete dentures.

    • Main Results:

    • No significant temperature increase was detected due to the exothermic polymerization reaction.
    • The resin temperature closely mirrored the waterbath temperature throughout the process.
    • Total linear shrinkage after two cycles was under 1%, comparable to single-stage techniques.
    • Recorded temperatures across different regions were synchronized.

    Conclusions:

    • Temperature differentials are not a contributing factor to denture warpage with this technique.
    • The dimensional changes observed with the two-stage processing technique are clinically insignificant.
    • This processing method offers favorable dimensional stability for complete dentures.