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  • Research Articles
    Relationship between battery level and irradiance of light-curing units and their effects on the hardness of a bulk-fill composite resin
    Fernanda Harumi Oku Prochnow, Patricia Valéria Manozzo Kunz, Gisele Maria Correr, Marina da Rosa Kaizer, Carla Castiglia Gonzaga
    Restor Dent Endod 2022;47(4):e45.   Published online November 3, 2022
    DOI: https://doi.org/10.5395/rde.2022.47.e45
    AbstractAbstract PDFPubReaderePub
    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.

    Citations

    Citations to this article as recorded by  
    • Effect of Battery Level During Successive Charging Cycles on the Performance of Certified and Low-cost Uncertified Light-curing Units Available on E-commerce
      TS Peres, G Oliveira, SP da Silva Sakamoto, M da Silva Faria, HL Carlo, CJ Soares
      Operative Dentistry.2024; 49(6): 673.     CrossRef
    • Influence of Exposure Distance on Light Irradiance of Dental Curing Lamps in Various Operating Modes
      Anna Lehmann, Kacper Nijakowski, Marta Mroczyk, Filip Podgórski, Beata Czarnecka, Anna Surdacka
      Applied Sciences.2024; 14(21): 9999.     CrossRef
    • ESTADO DA INTENSIDADE LUMINOSA DAS LÂMPADAS DE FOTOPOLIMERIZAÇÃO DAS CLÍNICAS ODONTOLÓGICAS DOS CENTROS DE SAÚDE DA CIDADE DE CUENCA
      Milton Alexis Quinchiguano Caraguay, David Ismael Bravo Achundia , Esteban Eduardo Amoroso Calle, Manuel Estuardo Bravo Calderon
      RECISATEC - REVISTA CIENTÍFICA SAÚDE E TECNOLOGIA - ISSN 2763-8405.2023; 3(6): e36296.     CrossRef
    • 558 View
    • 17 Download
    • 3 Web of Science
    • 3 Crossref
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    In-office dental bleaching with violet light emitting diode: bleaching efficacy and pulpal temperature rise
    Brunna Katyuscia de Almeida Guanaes, Talyta Neves Duarte, Gisele Maria Correr, Marina da Rosa Kaizer, Carla Castiglia Gonzaga
    Restor Dent Endod 2022;47(1):e7.   Published online February 3, 2022
    DOI: https://doi.org/10.5395/rde.2022.47.e7
    AbstractAbstract PDFPubReaderePub
    Objectives

    This study evaluated the bleaching efficacy of different in-office protocols associated with violet light emitting diode (V-LED), and measured the pulpal temperature rise caused by V-LED with or without gel application.

    Materials and Methods

    Bovine incisors were distributed in 4 groups (n = 10): VL – V-LED; HP – 35% hydrogen peroxide (control); HYB – hybrid protocol, V-LED applied without gel for 10 irradiation cycles followed by V-LED applied with gel for another 10 irradiation cycles; and HPVL – gel and V-LED applied for 20 irradiation cycles. Three bleaching sessions were performed with 7-day intervals. Bleaching efficacy was evaluated with Δ, ΔE00 and ΔWID. Data were recorded at baseline, 7, 14, 21 and 70 days. For pulpal temperature rise, thermocouples were placed inside the pulp chamber of human incisors. To determine intrapulpal temperature, the teeth were irradiated with V-LED with or without application of bleaching gel. Color difference data were analyzed by 2-way repeated measures ANOVA and Tukey’s test. Pulpal temperature was analyzed by t-test (α = 5%).

    Results

    VL exhibited lower color (ΔEab* and ΔE00) and whiteness changes (ΔWID) than the other groups. HPVL presented higher color change values than HYB. HYB and HPVL showed not different ΔWID values; and HP showed the highest whiteness changes at all times. There were significant differences comparing ΔT with gel (8.9°C) and without gel application (7.2°C).

    Conclusions

    HPLV was more efficient than HYB. The 2 protocols with VL showed similar results to control. Gel application combined with VL promoted higher pulpal temperature than to the no gel group.

    Citations

    Citations to this article as recorded by  
    • Effect of antioxidant on tooth sensitivity after bleaching
      Mohamed Nabil, Mostafa Mohamed Hasan, Eman Abd Elghany Shebl
      Journal of Esthetic and Restorative Dentistry.2024; 36(3): 429.     CrossRef
    • In-office Bleaching Activated With Violet LED: Effect on Pulpal and Tooth Temperature and Pulp Viability
      NR Carlos, RT Basting, KR Kantovitz, ES Bronze-Uhle, PN Lisboa Filho, V Cavalli, RT Basting
      Operative Dentistry.2024; 49(3): 262.     CrossRef
    • Low and high hydrogen peroxide concentrations of in-office dental bleaching associated with violet light: an in vitro study
      Isabela Souza Vardasca, Michael Willian Favoreto, Mylena de Araujo Regis, Taynara de Souza Carneiro, Emanuel Adriano Hul, Christiane Philippini Ferreira Borges, Alessandra Reis, Alessandro D. Loguercio, Carlos Francci
      Clinical Oral Investigations.2024;[Epub]     CrossRef
    • Bleaching efficacy of in-office bleaching with violet light using low-concentration hydrogen peroxide nanoparticulate photocatalyst gel: A randomized controlled trial
      Gustavo Garcia Castro, Palena Araújo Pinto, Michael Willian Favoreto, Alessandra Reis, Maria Viviana-Mora, Rita de Cássia Mendonça de Miranda, Andres Felipe Milan Cardenas, Alessandro D. Loguercio, Rudys Rodolfo de Jesus Tavarez
      Photodiagnosis and Photodynamic Therapy.2024; 50: 104410.     CrossRef
    • Influence of Different Light-Activated Bleaching Gels on Pulp Chamber Temperature: An In Vitro Study
      Mandana Karimi, Elmira Ataee, Ladan Ranjbar Omrani, Mahdi Abbasi, Elham Ahmadi
      Avicenna Journal of Dental Research.2024; 16(4): 225.     CrossRef
    • Continuous vs fractionated violet LED light protocols for dental bleaching: Evaluations of color change and temperature of the dental pulp and buccal surface
      Mayanna Pacheco Trindade Najar, Luciana Hilel Rangel Barbosa, Natália Russo Carlos, Fabiana Mantovani Gomes França, Cecilia Pedroso Turssi, Waldemir Francisco Vieira-Junior, Roberta Tarkany Basting
      Photodiagnosis and Photodynamic Therapy.2023; 42: 103631.     CrossRef
    • Improved esthetic efficacy and reduced cytotoxicity are achieved with a violet LED irradiation of manganese oxide-enriched bleaching gels
      Marlon Ferreira Dias, Beatriz Voss Martins, Rafael Antonio de Oliveira Ribeiro, Josimeri Hebling, Carlos Alberto de Souza Costa
      Lasers in Medical Science.2022;[Epub]     CrossRef
    • 712 View
    • 19 Download
    • 7 Web of Science
    • 7 Crossref
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