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Polymerization shrinkage of index and pattern acrylic resins.
Journal article

Polymerization shrinkage of index and pattern acrylic resins.

  • 1990-12-01
Published in:
  • The Journal of prosthetic dentistry. - 1990
Acrylic Resins
Dental Materials
Evaluation Studies as Topic
Methylmethacrylates
Polymers
Powders
Surface Properties
Temperature
Time Factors
English Inadequate dimensional stability caused by polymerization shrinkage has been reported concerning the various applications of acrylic resins. The objective of the study was to evaluate dimensional changes of two self-curing acrylic resins marketed as pattern and index material. Early volumetric changes were measured with a dilatometer and late linear changes were recorded with an inductive transducer. After 24 hours the volumetric shrinkage was 7.9% for Duralay resin and 6.5% for Palavit G resin; 80% of the change appears before 17 minutes at room temperature. Shrinkage was significantly increased when the proportion of powder in the mix was diminished. Results suggest that these resins should be used with some method to compensate for the shrinkage, when used as index material. However, the dimensional change might provide significant advantages for intracoronal castings.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://sonar.ch/global/documents/82882
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