Influence of Light-Curing Parameters on the Bond Strength of Bulk-Fill Repaired Microhybrid Resin Composite
DOI:
https://doi.org/10.15517/3p8v9928Keywords:
Resins, synthetic; Composite resins; Dental restoration repair; Tensile strength; Polymerization; Curing lights, dental.Abstract
This study evaluated the influence of photoactivation parameters, specifically radiant exposure and curing distance, on the microtensile bond strength (μTBS) of a microhybrid resin composite repaired with a bulk-fill composite. Seventy-two conventional resin composite blocks were prepared and thermocycled (10,000 cycles). Three light-curing modes were evaluated based on their clinical parameters: Standard (1000 mW/cm2, 20s), High Power (1400 mW/cm2, 8s), and Xtra Power (3200 mW/cm2, 6s). Specimen surfaces were ground with a diamond bur, etched with 35% phosphoric acid, and treated with a 2-step etch-and-rinse adhesive system (Adper Single Bond 2) before repairs were made with a bulk-fill composite. Specimens (n=12 per group) were divided based on the three irradiances and two curing distances (0 and 2 mm). After 14 days of water storage, μTBS was tested. Data were analyzed using two-way ANOVA (α=0.05). Curing distance significantly influenced μTBS, with higher values at 0 mm (p<0.05). The combination of Xtra Power (3200 mW/cm2) and increased distance (2 mm) led to numerous pre-test failures and a significant reduction in bond strength. Curing distance and radiant exposure are critical factors for bulk-fill composite repair bond strength. High irradiance combined with increased distance negatively affects repair quality, emphasizing the importance of proper photoactivation technique.
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Copyright (c) 2026 Anderson Kaian de Lima Maniçoba, Luan Gabriel Chaves Damasceno, Susana Joice Mendes Maia, Marília Regalado Galvão Rabelo Caldas, Vicente de Paulo Aragão Saboia, Boniek Castillo Dutra Borges, Diana Ferreira Gadelha de Araújo.
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Universidade Federal do Rio Grande do Norte,Universidade Federal do Rio Grande do Norte
Grant numbers PVD21607-2023
