Influence of a hydrophobic monomer on the physical and mechanical properties of experimental surface sealants

Autor(es)

Caldas Giorgi, Maria Cecilia ; Vogt, Amalie Perez ; Corneta, Carina de Jesus ; de Amoedo Campos Velo, Marilia Mattar ; Nunes Leite Lima, Debora Alves ; Marchi Baron, Giselle Maria ; Baggio Aguiar, Flavio Henrique

• Tipo de documento: Artigo Científico
• Fonte: BRAZILIAN ORAL RESEARCH; v. 32, p. 8-pg., 2018-01-01.

Resumo

This study evaluated the effect of adding the hydrophobic monomer 1,12 dodecanediol dimethacrylate (DDDMA) to experimental sealants with and without thermocycling on degree of conversion (DC), water sorption (WS), water solubility (WSB), color stability (Delta E), and micro-shear bond strength (mu SBS). Five experimental and one commercially available sealant (Bisco - BIS) were tested. The experimental sealants were formulated by mixing different percentages of DDDMA monomers and urethane dimethacrylate (UDMA). The photoinitiator system was composed by camphorquinone (CQ) and tertiary amine 4-ethyl benzoate dimetilamiono (EDBA). Ethanol was used as a solvent. The experimental groups were named sequentially according to the monomeric content (DDDMA/UDMA): S40/40 (40/40), S50/30 (50/30), S60/20 (60/20), S70/10 (70/10) and S80/0 (80/0). Data were analyzed separately by one-way ANOVA, followed by Tukey's test (p<0.05). The values of DC ranged from 94.59% (S40/40) to 54.02% (S80/10). BIS showed the highest WS value (p<0.05) and S40/40, S50/30, S60/20 and S80/0 showed the lowest WS values of all tested sealants. WSB values ranged from 7.88 mu g/mm(3) (BIS) to 13.27 mu g/mm(3) (S70/10). The highest Delta E value was 11.05 +/- 2.88 for BIS and the highest mu SBS value was found for S60/20. No significant difference was observed in bond strength between sealants and bovine enamel after thermocycling. Adding DDDMA to the composition of surface sealants can improve its performance, once the monomer increased the degree of conversion and the color stability. (AU)

• Processo FAPESP: 13/17868-3 - Avaliação de propriedades físicas de selantes de superfície experimentais e da influência na estabilidade de cor de um compósito
• Beneficiário: Amalie Perez Vogt
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 13/25376-3 - Avaliação da resistência de união de selantes de superfície experimentais aplicados ao esmalte bovino
• Beneficiário: Carina de Jesus Corneta
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica