Errors in light-emitting diodes positioning when curing bulk fill and incremental composites: impact on properties after aging
Balhaddad Abdulrahman A., Garcia Isadora M., Maktabi Haifa, Ibrahim Maria Salem, Alkhubaizi Qoot, Strassler Howard, Collares Fabricio M., Melo Mary Anne S.,
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( Balhaddad Abdulrahman A. ) - University of Maryland School of Dentistry Ph.D Program Dental Biomedical Sciences
( Garcia Isadora M. ) - University of Maryland School of Dentistry Ph.D Program Dental Biomedical Sciences
( Maktabi Haifa ) - University of Maryland School of Dentistry Department of General Dentistry
( Ibrahim Maria Salem ) - University of Maryland School of Dentistry Ph.D Program Dental Biomedical Sciences
( Alkhubaizi Qoot ) - University of Maryland School of Dentistry Department of General Dentistry
( Strassler Howard ) - University of Maryland School of Dentistry Department of General Dentistry
( Collares Fabricio M. ) - Federal University of Rio Grande do Sul School of Dentistry Department of Dental Materials
( Melo Mary Anne S. ) - University of Maryland School of Dentistry Department of General Dentistry
Abstract
Objectives: This study aimed to evaluate the effect of improper positioning single-peak and multi-peak lights on color change, microhardness of bottom and top, and surface topography of bulk fill and incremental composites after artificial aging for 1 year.
Materials and Methods: Bulk fill and incremental composites were cured using multi-peak and single-peak light-emitting diode (LED) following 4 clinical conditions: (1) optimal condition (no angulation or tip displacement), (2) tip-displacement (2 mm), (3) slight tip angulation (α = 20°) and (4) moderate tip angulation (α = 35°). After 1-year of water aging, the specimens were analyzed for color changes (ΔE), Vickers hardness, surface topography (Ra, Rt, and Rv), and scanning electron microscopy.
Results: For samples cured by single-peak LED, the improper positioning significantly increases the color change compared to the optimal position regardless of the type of composite (p < 0.001). For multi-peak LED, the type of resin composite and the curing condition displayed a significant effect on ΔE (p < 0.001). For both LEDs, the Vickers hardness and bottom/top ratio of Vickers hardness were affected by the type of composite and the curing condition (p < 0.01).
Conclusions: The bulk fill composite presented greater resistance to wear, higher color stability, and better microhardness than the incremental composite when subjected to improper curing. The multi-peak LED improves curing under improper conditions compared to single-peak LED. Prevention of errors when curing composites requires the attention of all personnel involved in the patient's care once the clinical relevance of the appropriate polymerization reflects on reliable long-term outcomes.
키워드
Composite resins; Curing lights, dental; Dental restoration, permanent; Dentistry, operative; Polymerization
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