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Related Experiment Videos

Resin cure determination by polymerization shrinkage

F Rueggeberg1, K Tamareselvy

  • 1Medical College of Georgia, School of Dentistry, Augusta, USA.

Dental Materials : Official Publication of the Academy of Dental Materials
|July 1, 1995
PubMed
Summary

A new volume shrinkage method accurately measures dental resin cure without expensive infrared spectrometers. This accessible technique is suitable for all researchers studying dental restorative materials.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Dental restorative resins are crucial in modern dentistry.
  • Accurate measurement of monomer conversion is essential for material performance.
  • Conventional methods like infrared spectroscopy require specialized equipment.

Purpose of the Study:

  • To develop a simple, cost-effective method for measuring dental resin monomer conversion.
  • To validate a volume-based shrinkage technique as an alternative to infrared spectroscopy.
  • To assess the cure of TEGDMA/MMA copolymers and commercial dental resins.

Main Methods:

  • Prepared TEGDMA/MMA copolymer specimens in varying compositions.
  • Measured pre- and post-cure volumes of bar-shaped and thin-film specimens.

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  • Compared volume change measurements with conventional infrared spectroscopic methods.

    • Main Results:

    • The volume shrinkage method showed no significant difference compared to infrared spectroscopy for commercial resins.
    • Similar cure extents were observed between the shrinkage and infrared methods for thin-film copolymers.
    • Resin cure decreased with increasing TEGDMA content in TEGDMA/MMA copolymers.

    Conclusions:

    • The specimen volume method is a reliable alternative for determining resin cure.
    • This technique is easily performed and does not require expensive equipment.
    • The developed method enhances accessibility for researchers in dental materials science.