RT Journal Article
T1 Ions-modified nanoparticles affect functional remineralization and energy dissipation through the resin-dentin interface.
A1 Toledano, Manuel
A1 Osorio, Raquel
A1 Osorio, Estrella
A1 Medina-Castillo, Antonio Luis
A1 Toledano-Osorio, Manuel
A1 Aguilera, Fátima S
K1 Adhesive
K1 Chemical
K1 Dentin
K1 Mechanical
K1 Mineralization
K1 Nanoparticles
AB The aim of this study was to evaluate changes in the mechanical and chemical behavior, and bonding ability at dentin interfaces infiltrated with polymeric nanoparticlesstandard deviations and modes of failure are (NPs) prior to resin application. Dentin surfaces were treated with 37% phosphoric acid followed by application of an ethanol suspension of NPs, Zn-NPs or Ca-NPs followed by the application of an adhesive, Single Bond (SB). Bonded interfaces were stored for 24h, submitted to microtensile bond strength test, and evaluated by scanning electron microscopy. After 24h and 21 d of storage, the whole resin-dentin interface adhesive was evaluated using a Nano-DMA. Complex modulus, storage modulus and tan delta (δ) were assessed. AFM imaging and Raman analysis were performed. Bond strength was not affected by NPs infiltration. After 21 d of storage, tan δ generally decreased at Zn-NPs/resin-dentin interface, and augmented when Ca-NPs or non-doped NPs were used. When both Zn-NPs and Ca-NPs were employed, the storage modulus and complex modulus decreased, though both moduli increased at the adhesive and at peritubular dentin after Zn-NPs infiltration. The phosphate and the carbonate peaks, and carbonate substitution, augmented more at interfaces promoted with Ca-NPs than with Zn-NPs after 21 d of storage, but crystallinity did not differ at created interfaces with both ions-doped NPs. Crosslinking of collagen and the secondary structure of collagen improved with Zn-NPs resin-dentin infiltration. Ca-NPs-resin dentin infiltration produced a favorable dissipation of energy with minimal stress concentration trough the crystalline remineralized resin-dentin interface, causing minor damage at this structure.
YR 2017
FD 2017-01-25
LK http://hdl.handle.net/10668/10829
UL http://hdl.handle.net/10668/10829
LA en
DS RISalud
RD Apr 7, 2025