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Resin pattern material with low polymerization shrinkage.

J Takahashi1, K Kitahara, F Teraoka

  • 1Department of Dental Materials Science and Technology, Osaka University Faculty of Dentistry, Japan. j-takaha@dent.osaka-u.ac.jp

The International Journal of Prosthodontics
|January 15, 2000
PubMed
Summary
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Researchers developed a low polymerization shrinkage resin for dental patterns. Adding chemical substances to self-curing acrylic resin reduced shrinkage by two-thirds, improving implant superstructure fit.

Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Dental resin patterns are crucial for implant-supported superstructures.
  • High polymerization shrinkage in resins can lead to poor fit and complications.
  • Minimizing shrinkage is essential for predictable clinical outcomes.

Purpose of the Study:

  • To develop a novel resin material with significantly reduced polymerization shrinkage.
  • To enhance the marginal and internal fit of long implant superstructures.
  • To investigate the efficacy of chemical additives in mitigating resin shrinkage.

Main Methods:

  • Three distinct chemical substances were incorporated into a self-curing acrylic resin at varying concentrations (1-20 wt%).
  • Specimens were fabricated using brush-on, injection, and injection-press methods within a conical mold.

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  • Linear polymerization shrinkage was quantified by measuring specimen protrusion from the mold.

    • Main Results:

    • The injection-press and brush-on techniques yielded the lowest polymerization shrinkage (P < 0.05).
    • The injection-press method demonstrated superior reproducibility with a smaller standard deviation.
    • All tested additives reduced shrinkage by approximately two-thirds compared to the base resin when using the injection-press method and a 2.00:1.00 powder-to-liquid ratio.

    Conclusions:

    • Incorporating specific chemical additives into the liquid component of self-curing acrylic resin effectively reduces linear polymerization shrinkage.
    • The developed material offers a significant reduction in shrinkage, approximately one-third of the original resin.
    • This advancement holds potential for improving the precision and fit of dental prosthetics, particularly long superstructures on implants.