Effects of extending duration of exposure to curing light and different measurement methods on depth-of-cure analyses of conventional and bulk-fill composites

Autor(es)

de Cassia Romano, Beatriz ^[1] ; Soto-Montero, Jorge ^{[1, 2]} ; Rueggeberg, Frederick A. ^[3] ; Giannini, Marcelo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba - Brazil

^[2] Univ Costa Rica, Sch Dent, Dept Restorat Dent, Montes De Oca - Costa Rica

^[3] Augusta Univ, Dent Coll Georgia, Dept Restorat Sci, Augusta, GA - USA

• Tipo de documento: Artigo Científico
• Fonte: European Journal of Oral Sciences; v. 128, n. 4 JUN 2020.
• Citações Web of Science: 0

Resumo

This study evaluated the effect of extending the duration of exposure to curing light on the depth of cure of two conventional (RBC1-conventional and RBC2-conventional) and two bulk-fill (RBC1-bulk and RBC2-bulk) resin composites. Polywave and single-peak photocuring units were used. Cylinder-shaped specimens were exposed to curing light either for the time period recommended by the manufacturer or twice the length of that time, and depth of cure was estimated using manual scraping (similar to the ISO-4049 standard) and solvent immersion techniques. Depth of cure was analyzed, using two-way ANOVA, for the factors measurement method and exposure time. For RBC1-conventional and RBC1-bulk, the solvent immersion technique estimated a greater depth of cure than did manual scraping; for RBC1-conventional, both techniques and both light-exposure time periods resulted in a depth of cure of >2 mm; and for RBC1-bulk, only the solvent method after photocuring for twice the manufacturer's recommended time resulted in a depth of cure of 5 mm. For RBC2-conventional and RBC2-bulk, neither technique nor exposure time resulted in estimated depths of cure that matched those indicated by the manufacturer. The results suggest that extending the duration of photopolymerization increases depth of cure. Also, calculation of depth of cure can vary according to the measurement technique used. (AU)

• Processo FAPESP: 18/11976-2 - Estudo comparativo de métodos para avaliação da profundidade de cura de compósitos restauradores
• Beneficiário: Beatriz de Cássia Romano
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica