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Polymerization of composites using pulsed laser

Z Tarle1, A Meniga, M Ristic

  • 1Department of Restorative Dentistry, School of Dentistry, University of Zagreb, Croatia.

European Journal of Oral Sciences
|December 1, 1995
PubMed
Summary
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Pulsed laser light sources significantly improve the polymerization of dental composites compared to standard units. Darker composite shades show lower conversion rates regardless of the light source used.

Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • The efficacy of visible-light-cured dental composites is contingent upon the light source's ability to achieve adequate polymerization.
  • Composite shade and material type influence light penetration and polymerization efficiency.

Purpose of the Study:

  • To compare the degree of conversion (DC) in hybrid and microfilled composites of varying shades when exposed to a standard curing unit versus a pulsed laser.
  • To evaluate the impact of different light sources on polymerization depth and efficiency.

Main Methods:

  • Dental composites (hybrid and microfilled, light and dark shades) were subjected to photopolymerization.
  • Light sources included a standard curing unit and a pulsed laser (λ=468 nm).

Related Experiment Videos

  • Degree of conversion was quantified using Fourier transform infrared spectroscopy (FTIR) at the surface and at depths of 1.0, 2.0, and 3.0 mm.

    • Main Results:

    • Pulsed laser polymerization yielded significantly higher degrees of conversion across all composite types and shades compared to the standard curing unit.
    • Darker shades exhibited lower DC values irrespective of the photopolymerization method.
    • Enhanced polymerization was observed not only at the surface but also at greater depths (1.0-3.0 mm) with the pulsed laser.

    Conclusions:

    • Pulsed laser light sources offer superior polymerization capabilities for dental composites, leading to higher degrees of conversion.
    • The effectiveness of polymerization is diminished in darker shades, necessitating careful material selection and light source consideration.
    • The pulsed laser's high power density facilitates deeper and more effective material curing.