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Related Experiment Videos

Conversion of dual cure luting cements

A H Darr1, P H Jacobsen

  • 1Department of Conservative Dentistry, University of Wales College of Medicine, Cardiff, U.K.

Journal of Oral Rehabilitation
|January 1, 1995
PubMed
Summary

Dual cure polymeric luting agents showed better performance than chemical-only curing. However, light curing is essential for optimal hardness and clinical success, especially in deep cavities.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Polymeric luting agents are crucial for dental restorations.
  • Dual-cure materials offer advantages but require thorough evaluation.
  • Understanding cure efficiency impacts clinical longevity.

Purpose of the Study:

  • To assess the cure efficiency and rate of dual-cure polymeric luting agents.
  • To compare light-cured versus chemically cured conditions.
  • To evaluate the impact of curing method on material properties.

Main Methods:

  • Indentation hardness testing to measure polymer conversion.
  • Curing agents under manufacturer's instructions with visible light.
  • Curing agents in the absence of light (chemical cure only).
  • Extrapolation of hardness values to predict flexural strength.

Main Results:

  • Light-cured materials showed rapid hardness increase post-curing, followed by gradual increase over 24 hours.
  • Chemically cured materials exhibited slower hardness development and were initially too soft for testing.
  • Dual curing demonstrated superior effectiveness compared to chemical curing alone.
  • Formulation balance is critical for conversion and color stability.

Conclusions:

  • Dual-cure luting agents require light activation for optimal performance.
  • Inadequate light penetration in deep cavities may lead to under-cured areas.
  • Material formulation presents a trade-off between conversion and potential color instability.

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