Effect of light curing units on color stability and mechanical properties of resin cements after aging

• Autor(a) principal: Farina, Morgana Fernandes de Freitas
• Data de Publicação: 2024
• Outros Autores: Moda, Mariana Dias, Fagundes, Ticiane Cestari, Briso, André Luiz Fraga, dos Santos, Paulo Henrique
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Brazilian Journal of Health Review
• Texto Completo: https://ojs.brazilianjournals.com.br/ojs/index.php/BJHR/article/view/67591
• topic: color stability; dental cements; hardness test; light curing unit; photoinitiators

This study aimed to evaluate the color stability, Martens hardness (HMV), and modulus of elasticity (Eit*) of resin cements light-cured using two types of light-emitting diodes (LED) subjected to ultraviolet (UV) aging. Two resin cements were used: light-cured (RelyX Veener) and dual-cured (Variolink II). Forty discs were confectioned for each resin cement (with a diameter of 5 mm and thickness of 1.5 mm). Half of the samples were light-cured by a Radii-cal singlewave and the other half by a Valo® polywave. The specimens were then stored at 37 °C and 100% relative humidity for 24 h to ensure complete polymerization. Baseline evaluations of the color alteration, HMV, and Eit* were performed. The specimens were aged for 252 h in an UV-accelerated aging chamber. Then, a final analysis was performed. Two-way repeated-measures ANOVA was performed on the color changes. Meanwhile, three-way repeated-measures ANOVA followed by Tukey´s test was performed on HMV and Eit* to compare the means (α = 0.05). With regard to the color alteration (ΔE), there was no statistically significant difference between the materials or between the light curing units (p > 0.05). With regard to the mechanical properties, Valo® promoted high values of HMV and Eit* compared with Radii-cal (p < 0.05). With regard to the resin cements, Variolink II showed higher HMV and Eit* values than RelyX Veneer (p < 0.05), except for Eit* after UV aging. The light-curing unit influenced the mechanical properties but not the color stability of the resin cements.