Marilia Mattar de Amoêdo Campos Velo

Longevity of restorations in direct composite resin: literature review

As restauracoes de resinas compostas tem aumentado consideravelmente em popularidade e previsibilidade, possibilitando a realizacao de um tratamento odontologico minimamente invasivo. No entanto, para se obter o sucesso das restauracoes de resina composta e necessario ter conhecimento dos materiais adesivos e da tecnica de utilizacao, caso contrario os insucessos podem aparecer rapidamente. Assim, o objetivo deste trabalho foi realizar uma revisao de literatura sobre o desempenho clinico de diferentes tipos de resinas compostas e de sistemas adesivos no que se refere a longevidade. Para essa avaliacao foram verificadas algumas caracteristicas das restauracoes logo apos elas serem finalizadas e depois de um determinado tempo. Caracteristicas como sensibilidade pos-operatoria, cor, integridade marginal, carie secundaria, textura, adaptacao marginal, retencao, deslocamento, descoloracao marginal, forma anatomica, tiveram seus desempenhos comparados. A influencia dos varios sistemas adesivos na longevidade das restauracoes foi tambem observada em funcao da sua fundamental importância na uniao entre o dente e o material restaurador. Concluiu-se que a maioria das restauracoes se apresentou clinicamente aceitavel, quando se usou resinas compostas hibridas, nanoparticuladas ou microhibridas e sistema adesivo convencional.

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

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 (ΔE), and micro-shear bond strength (μSBS). 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 Tukeys 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 µg/mm3 (BIS) to 13.27 µg/mm3 (S70/10). The highest ΔE value was 11.05±2.88 for BIS and the highest μSBS 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.