Effect of blue and violet light on polymerization shrinkage vectors of a CQ/TPO-containing composite

Dental Materials : Official Publication of the Academy of Dental Materials
Camila S SampaioRegina M Puppin-Rontani

Abstract

To evaluate the effect of light-curing wavelengths on composite filler particle displacement, and thus to visualize localized polymerization shrinkage in a resin-based composite (RBC) containing camphorquinone (CQ) and Lucirin TPO (TPO). Three light-curing units (LCUs) were used to light-cure a RBC containing CQ and TPO: a violet-only, a blue-only, and a dual-wavelength, conventional (Polywave®, emitting violet and blue wavelengths simultaneously). Zirconia fillers were added to the RBC to act as filler particle displacement tracers. LCUs were characterized for total emitted power (mW) and spectral irradiant output (mW/cm2/nm). 2-mm high, 7-mm diameter silanized glass cylindrical specimens were filled in a single increment with the RBC, and micro-computed tomography (μ-CT) scans were obtained before and after light-curing, according to each LCU (n=6). Filler particle movement identified polymerization shrinkage vectors, traced using software, at five depths (from 0 up to 2mm): top, top-middle, middle, middle-bottom and bottom. Considering different RBC depths within the same LCU, use of violet-only and conventional LCUs showed filler particle movement decreased with increased depth. Blue-only LCU showed homogeneous filler parti...Continue Reading

References

Aug 27, 2016·International Braz J Urol : Official Journal of the Brazilian Society of Urology·Bruno MarroigLuciano A Favorito

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Citations

Jun 25, 2020·International Journal of Hyperthermia : the Official Journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group·H Petra KokJohannes Crezee
Sep 17, 2020·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·Camila S SampaioPablo J Atria
Feb 27, 2020·Operative Dentistry·C S SampaioE Mahn
Nov 5, 2020·Dental Materials : Official Publication of the Academy of Dental Materials·Jorge Soto-MonteroMarcelo Giannini
Nov 5, 2020·Brazilian Oral Research·Christine Nagel BackesRoberta Tarkany Basting
Mar 7, 2021·Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [et Al.]·Beatriz Curvello de MendonçaMarcelo Giannini
Sep 23, 2020·Journal of the Mechanical Behavior of Biomedical Materials·C ÖzcanY Josset
Aug 28, 2021·European Journal of Dentistry·Mateus Garcia RochaAmérico Bortolazzo Correr

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