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Correlation between ceramics translucency and polymerization efficiency through ceramics.

Nicoleta Ilie1, Reinhard Hickel

  • 1Department of Restorative Dentistry, Dental School of the Ludwig-Maximilians-University, Goethestreet 70, 80336 Munich, Germany. nicoleta.ilie@dent.med.uni-muenchen.de <nicoleta.ilie@dent.med.uni-muenchen.de>

Dental Materials : Official Publication of the Academy of Dental Materials
|December 21, 2007
PubMed
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High-intensity light curing requires at least 15 seconds for optimal luting composite hardness, regardless of ceramic type or thickness. Dual-curing significantly enhances composite hardness by approximately 50%.

Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Polymer Chemistry

Background:

  • Accurate curing of luting composites is crucial for dental restoration longevity.
  • High-intensity curing units are increasingly used, necessitating an understanding of their efficacy with various dental ceramics.
  • Ceramic properties like type, thickness, and translucency can influence light penetration and composite curing effectiveness.

Purpose of the Study:

  • To analyze the impact of high-intensity light curing parameters on luting composite hardness.
  • To determine the effects of ceramic type, thickness, and translucency on curing efficacy.
  • To establish the critical translucency value for adequate composite curing.

Main Methods:

  • Vickers micro-hardness testing was employed on luting composite films (Variolink II).

Related Experiment Videos

  • Effects of varying curing times (5-15s), ceramic types (leucite-reinforced, lithium disilicate), thicknesses (0.5-3mm), and translucencies were evaluated.
  • Ceramic translucency was measured using spectrophotometry.

    • Main Results:

    • A minimum curing time of 15s was required for maximum luting composite hardness.
    • Dual-curing increased composite hardness by approximately 50%.
    • Curing time had the most significant impact on hardness, followed by translucency, ceramic type, and thickness.

    Conclusions:

    • High-power curing units do not consistently reduce necessary exposure times; 15s is recommended.
    • Ceramic properties, especially density and translucency, significantly affect light penetration and composite curing.
    • The influence of light activation on dual-curing luting composites is substantial and should not be overlooked.