Relationship between battery level and irradiance of light-curing units and their effects on the hardness of a bulk-fill composite resin
Prochnow Fernanda Harumi Oku, Kunz Patricia Valeria Manozzo, Correr Gisele Maria, Kaizer Marina da Rosa, Gonzaga Carla Castiglia,
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( Prochnow Fernanda Harumi Oku ) - Universidade Positivo Graduate Program in Dentistry School of Health Sciences
( Kunz Patricia Valeria Manozzo ) - Universidade Positivo Graduate Program in Dentistry School of Health Sciences
( Correr Gisele Maria ) - Universidade Positivo Graduate Program in Dentistry School of Health Sciences
( Kaizer Marina da Rosa ) - Universidade Positivo Graduate Program in Dentistry School of Health Sciences
( Gonzaga Carla Castiglia ) - Universidade Positivo Graduate Program in Dentistry School of Health Sciences
Abstract
Objectives This study evaluated the relationship between the battery charge level and irradiance of light-emitting diode (LED) light-curing units (LCUs) and how these variables influence the Vickers hardness number (VHN) of a bulk-fill resin.
Materials and Methods Four LCUs were evaluated: Radii Plus (SDI), Radii-cal (SDI), Elipar Deep Cure (Filtek Bulk Fill, 3M Oral Care), and Poly Wireless (Kavo Kerr). Irradiance was measured using a radiometer every ten 20-second activations until the battery was discharged. Disks (4 mm thick) of a bulk-fill resin (Filtek Bulk Fill, 3M Oral Care) were prepared, and the VHN was determined on the top and bottom surfaces when light-cured with the LCUs with battery levels at 100%, 50% and 10%. Data were analyzed by 2-way analysis of variance, the Tukey’s test, and Pearson correlations (α = 5%).
Results Elipar Deep Cure and Poly Wireless showed significant differences between the irradiance when the battery was fully charged versus discharged (10% battery level). Significant differences in irradiance were detected among all LCUs, within each battery condition tested. Hardness ratios below 80% were obtained for Radii-cal (10% battery level) and for Poly Wireless (50% and 10% battery levels). The battery level showed moderate and strong, but non-significant, positive correlations with the VHN and irradiance.
Conclusions Although the irradiance was different among LCUs, it decreased in half of the devices along with a reduction in battery level. In addition, the composite resin effectiveness of curing, measured by the hardness ratio, was reduced when the LCUs’ battery was discharged.
키워드
Composite resins; Hardness; Light; Polymerization
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