Effect of Nanofiller Loading on Cure Efficiency and Potential Color Change of Model Composites

Autor(es)

Ramos Salles de Oliveira, Dayane Carvalho ^{[1, 2]} ; de Menezes, Livia Rodrigues ^[3] ; Gatti, Alexandre ^[1] ; Sobrinho, Lourenco Correr ^[1] ; Ferracane, Jack L. ^[2] ; Coelho Sinhoreti, Mario Alexandre ^[1]

Afiliação do(s) autor(es)

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

^[2] Oregon Hlth & Sci Univ, Sch Dent, Dept Restorat Dent, Portland, OR 97201 - USA

^[3] Univ Fed Rio de Janeiro, Inst Macromol, Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Esthetic and Restorative Dentistry; v. 28, n. 3, p. 171-177, MAY-JUN 2016.
• Citações Web of Science: 8

Resumo

ObjectivesTo evaluate the effect of nanofiller loading on cure efficiency and potential color change of experimental composites. Materials and MethodsFour different polymeric materials were produced using the same organic matrix blend. To this matrix, different amounts of 0.05 m fumed silica filler were added: no filler, 13, 52, and 65wt%. Fourier transform infrared spectroscopy was used to evaluate the degree of conversion (DC) for each composite using near-IR analysis, and spectrophotometry according to CIELab chromatic space was used to evaluate the color change.To induce color change, composites were artificially aged with exposure to cycles of UV-B light for 300 hours. Trasmission electron microscopy was used to illustrate nanoffiler aglomeration in the resin matrix. Data were analyzed using correlation analysis (=0.05). ResultsThere was an excellent inverse linear correlation between filler wt% and either DC or color change. Greater changes to red (+a) and yellow (+b) were observed as the filler wt% increased. ConclusionsA higher percentage of nano-sized filler particles in dental resin composites directly affects their cure efficiency and potential for color change. Clinical SignificanceThe increase in filler particle loading negatively affected monomer conversion and color stability of resin-based composites. As reduced filler loading results in poorer mechanical properties, to enhance color stability, resin-based composites should be formulated by making the refractive index of the polymeric matrix more closely match that of the filler throughout the polymerization process. (J Esthet Restor Dent, 2016) (AU)

• Processo FAPESP: 13/04241-2 - Influência do sistema fotoiniciador e agentes redutores nas propriedades físicas de resinas experimentais fotoativadas por LEDs
• Beneficiário: Dayane Carvalho Ramos Salles de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado