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Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation
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Cure width potential for MOD resin composite molar restorations.

William M Palin1, Dilek P Senyilmaz, Peter M Marquis

  • 1Biomaterials Unit, School of Dentistry, University of Birmingham, St. Chad's Queensway, Birmingham B4 6NN, UK. w.m.palin@bham.ac.uk

Dental Materials : Official Publication of the Academy of Dental Materials
|February 29, 2008
PubMed
Summary
This summary is machine-generated.

Modern light-curing units (LCUs) with varying spectra and dimensions impact resin composite curing depth. Photoinitiator chemistry and light intensity significantly influence the hardness of extensive restorations, affecting clinical success.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Effective polymerization of resin composites is crucial for durable dental restorations.
  • Light-curing units (LCUs) are essential for initiating this polymerization process.
  • Variations in LCU technology and resin formulations can influence curing efficiency.

Purpose of the Study:

  • To evaluate the efficacy of different modern LCUs for curing extensive resin composite restorations in a single application.
  • To assess how variations in LCU emission spectra and exit window dimensions affect curing depth and uniformity.
  • To investigate the role of photoinitiator chemistry in conjunction with LCU parameters on composite curing.

Main Methods:

  • Resin composite specimens with varying photoinitiator ratios (camphorquinone and/or TPO) were prepared in a bar mold (12x2x2 mm).
  • Specimens were cured using a halogen (QTH), conventional LED, and two bimodal LED LCUs with different light intensities.
  • Vickers hardness was measured at 1 mm increments across the lateral surfaces to assess curing depth and uniformity.

Main Results:

  • Significant linear correlations were found between light intensity and hardness values across all LCUs and products.
  • No significant differences in surface hardness were observed for some composites (TC, TE) between conventional LED and modified bimodal LED LCUs.
  • One composite (TT, CQ only) showed significantly decreased hardness with a modified bimodal LED LCU, while another (TB, TPO/reduced CQ) exhibited increased edge-to-center hardness ratios with specific LCUs.

Conclusions:

  • The curing efficiency of extensive resin composites is significantly influenced by LCU light intensity, spectral output, and photoinitiator composition.
  • Variability in LCU performance necessitates careful consideration of both the light source and the restorative material for optimal clinical outcomes.
  • Understanding these interactions is key to achieving adequate polymerization throughout the depth of large restorations.