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Conversion degrees of resin composites using different light sources.

Bora Ozturk1, Nevin Cobanoglu, Ali Rıza Cetin

  • 1Department of Restorative Dentistry, Faculty of Dentistry, Selcuk University, Konya, TURKIYE.

European Journal of Dentistry
|February 15, 2013
PubMed
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Conventional halogen lamps (QTH) and Filtek Z 250 composite demonstrated the highest degree of conversion (DC) among tested materials and light sources. This study compared six composites and three light sources, finding significant differences in DC performance.

Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Photopolymerization

Background:

  • Dental composites are widely used restorative materials.
  • Optimizing the degree of conversion (DC) is crucial for material longevity and performance.
  • Different light-curing technologies (LED, PAC, QTH) may influence DC.

Purpose of the Study:

  • To compare the degree of conversion (DC) of six dental composite materials.
  • To evaluate the impact of three distinct light sources (LED, PAC, QTH) on composite DC.

Main Methods:

  • Six composite materials were tested: Filtek Z 250, Filtek P60, Spectrum TPH, Pertac II, Clearfil AP-X, and Clearfil Photo Posterior.
  • Samples were light-cured using LED (40s), PAC (10s), and QTH (40s) in Teflon molds.
  • Fourier Transform Infrared Spectroscopy (FTIR) measured the degree of conversion (DC), analyzed by two-way ANOVA and Tukey HSD test.
Keywords:
Degree of conversionFTIRcompositeslight sourcesmonomer

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Main Results:

  • Both light source and composite type significantly affected the degree of conversion (DC) (P<.05).
  • Conventional halogen lamps (QTH) yielded significantly higher DC than LED (P<.05).
  • Filtek Z 250 with QTH showed the highest DC (70%), while Clearfil Photo Posterior with LED had the lowest (43%).

Conclusions:

  • The degree of conversion (DC) is dependent on both the light source and the specific composite material used.
  • Conventional halogen lamps (QTH) and composites Filtek Z 250 and Filtek P 60 demonstrated superior DC performance.
  • Material selection and light-curing technique are critical for achieving optimal composite polymerization.