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In vitro degradation of resin–dentin bonds analyzed by microtensile bond test, scanning and transmission electron microscopy
- Source :
-
Biomaterials . Sep2003, Vol. 24 Issue 21, p3795. 9p. - Publication Year :
- 2003
-
Abstract
- Our knowledge of the mechanisms responsible for the degradation of resin–dentin bonds are poorly understood. This study investigated the degradation of resin–dentin bonds after 1 year immersion in water. Resin–dentin beams (adhesive area: 0.9 mm2) were made by bonding using a resin adhesive, to extracted human teeth. The experimental beams were stored in water for 1 year. Beams that had been stored in water for 24 h were used as controls. After water storage, the beams were subjected to microtensile bond testing. The dentin side of the fractured surface was observed using FE-SEM. Subsequently, these fractured beams were embedded in epoxy resin and examined by TEM. The bond strength of the control specimens (40.3±15.1 MPa) decreased significantly (<f>p<0.01</f>) after 1 year of water exposure (13.3±5.6 MPa). Loss of resin was observed within fractured hybrid layers in the 1 year specimens but not in the controls. Transmission electron microscopic examination revealed the presence of micromorphological alterations in the collagen fibrils after 1 year of water storage. These micromorphological changes (resin elution and alteration of the collagen fibrils) seem to be responsible for the bond degradation leading to bond strength reduction. [Copyright &y& Elsevier]
- Subjects :
- *TEETH
*CALCIUM compounds
*BIOMEDICAL materials
Subjects
Details
- Language :
- English
- ISSN :
- 01429612
- Volume :
- 24
- Issue :
- 21
- Database :
- Academic Search Index
- Journal :
- Biomaterials
- Publication Type :
- Academic Journal
- Accession number :
- 10436097
- Full Text :
- https://doi.org/10.1016/S0142-9612(03)00262-X