Adhesive interface degradation : what are the consequences to restorations longevity?

Objetivo: Este estudio tiene por objetivo comparar el rendimiento de diferentes sistemas adhesivos en relación con la degradación hidrolítica y presentar posibles alternativas para minimizar o evitar esa degradación. Material y método: Una revisión de la literatura fue realizada a través de la base de datos PubMed. Se utilizaron las siguientes palabras claves durante la búsqueda: hydrolytic degradation, dentin, hybrid layer degradation, collagen. Conclusión: La degradación hidrolítica está directamente relacionada con los sistemas adhesivos simplificados. Substancias y técnicas están siendo desarrolladas con el fin de mejorar la estabilidad de la interfaz adhesiva, minimizando los efectos de la hidrólisis, sin embargo, los estudios con evidencia clínica sobre la aplicabilidad de los mismos todavía son escasos.The aim of this article is to discuss the hydrolytic degradation of different adhesive systems and alternatives to minimize or avoid degradation. The review of literature was performed using the PubMed database. The keywords used were: hydrolytic degradation, dentin, hybrid layer degradation, collagen. It can be concluded that hydrolytic degradation has been related to simplified adhesive systems. Substances and techniques are being studied to improve the bonded interface stability and minimize the hydrolysis effects, however, clinical evidence related to their applicability is scarce.Fil: Cintra Mailart, Mariane. Universidad Estadual Paulista "Júlio de Mesquita Filho" (Brasil)Fil: Bogado Escobar, Lorena. Universidad Estadual Paulista "Júlio de Mesquita Filho" (Brasil)Fil: Poletto, Adriana . Universidad Nacional de Cuyo. Facultad de OdontologíaFil: Bühler Borges, Alessandra. Universidad Estadual Paulista "Júlio de Mesquita Filho" (Brasil

Pellicle modification with natural bioproducts: Influence on tooth color under erosive conditions.

Salivary pellicle was modified with bioproducts and we assessed the change in tooth color and the protection of enamel to erosion. Human enamel specimens were assigned to one of three solutions: grape seed extract or black tea (bioproducts), or deionized water (negative control); after which one half the specimens underwent erosive challenges. The specimens underwent 15 cycles involving salivary pellicle formation (10 min, 37°C), incubation in solution (2 min, 25°C), subsequent pellicle formation (90 min, 37°C). Half of the specimens was kept in a humid chamber and the other half was submitted to erosion (2 min, 1% citric acid). After 15 such cycles, the pellicle was removed. Tooth color and the surface reflection intensity were assessed after every five cycles and after pellicle removal. For non-eroded specimens, the exposure to bioproducts promoted significantly greater color change than the deionized water, with increases in yellow appearance. After pellicle removal, the color was similar in all non-eroded specimens. The bioproducts increased the surface reflection intensity over cycles. For the erosion-exposed specimens, erosion itself resulted in color change. Black tea and deionized water resulted in increased yellow appearance. Exposure to the bioproducts resulted in higher relative surface reflection intensity values over time, but only grape seed extract resulted in higher relative surface reflection intensity value at the time of pellicle removal. The bioproducts caused transient staining effect, which was reduced after pellicle removal. For enamel submitted to erosion, grape seed extract resulted in less color change and better protection of enamel against erosion than black tea or water