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[Opacity and opacity changes in composites].

T Luckenbach1, G M Lösche, J F Roulet

  • 1Fachbereich Zahn-, Mund- und Kieferheilkunde der FU Berlin.

Deutsche Zahnarztliche Zeitschrift
|September 1, 1991
PubMed
Summary
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The opacity of composite resins, crucial for dental restorations, increased after water storage, especially in microfilled types. Longer polymerization times may mitigate these opacity changes.

Area of Science:

  • Dental Materials Science
  • Polymer Chemistry

Background:

  • Composite resins are widely used in dental restorations.
  • Understanding their optical properties, like opacity, is vital for aesthetic outcomes.
  • Factors influencing resin opacity require thorough investigation.

Purpose of the Study:

  • To evaluate the opacity of self-curing and light-curing composite resins.
  • To assess the effect of water and dry storage on resin opacity over 180 days.
  • To determine the influence of polymerization time on composite resin opacity.

Main Methods:

  • Opacity measurements using a UV-visible spectrophotometer.
  • Testing of 5 self-curing and 11 light-curing composite resins.
  • Storage conditions included dry and water immersion for 180 days.

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Main Results:

  • Hybrid composite resin opacity ranged from 47.3-62.4%; microfilled resins ranged from 48-64.4%.
  • Water storage significantly increased opacity more than dry storage.
  • Spectral opacity decreased with increasing wavelengths, particularly in microfilled resins.

Conclusions:

  • Water storage negatively impacts the opacity of most composite resins, affecting aesthetics.
  • Increased polymerization time may help reduce opacity changes caused by water storage.
  • Microfilled composite resins show a notable decrease in spectral opacity with longer wavelengths.