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The influence of different light sources on thermal effects generated during polymerization of bulk‑fill flowable dental composite base material

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Sebastian Pryliński, Joanna Kleczewska, Kinga Bociong, Agnieszka Pacyk, Monika Domarecka, Jerzy Sokołowski



2/2015/XLIII s. 35–41
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Fraza do cytowania: Pryliński S., Kleczewska J., Bociong K., Pacyk A., Domarecka M., Sokołowski J. The influence of different light sources on thermal effects generated during polymerization of bulk‑fill flowable dental composite base material. Dental Forum. 2015;XLIII(2):35–41.

Introduction. Contemporary flow composite materials make even very deep cavities processing possible. Recent changes in their structural composition made them displace traditional foundation materials as well as modify application techniques (the bulk‑fill method). The hardening of the composites happens during the exothermic photopolymerization reaction while using the polymerization lamp. The thermal effect of such reaction is the summary derivative of the kinetics of the reaction itself as well as the energy delivered by the light source used in the process. This, however, needs more precise analysis considering the potential influence that temperature rise may have on the surrounding teeth tissues. Aim. Evaluating the thermal effects accompanying the cross‑linking process of “bulk fill” composite material according to the kind of light curing unit used. Material and methods. Liquid SDR (Dentsply) composite material in the form of dental fillings was used for conducting this research. Samples were prepared in an open silicone mould, 5 mm in diameter and 1 mm thick. The SDR material was exposed to polymerization up to 1 mm deep, with the use of six various different light curing units providing the continuity of polymerization process. This consisted in exposing material to full lamp strength, according to the producer’s instruction. The thermal results were registered as thermograms by the thermographic camera VigoCam v50 (VigoSystem Polska) with frequency of 20 frames per second. The above measurements were subject to analysis with the use of Therm (VigoSystem Polska) and Excel (Microsoft) software what made complex assessment of material temperature changes in process of their hardening possible. Results. The kind of light curing unit used and the surrounding conditions significantly influence the rate of temperature rise in the initial seconds of polymerization process. The higher lamp’s power density, the higher rate of temperature growth. Lengthening of light exposure time results in statistically measurable higher levels of the maximum attainable temperature.

Key words: dental composites, bulk fill, light curing units, thermal effects.





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