X-ray photoelectron spectroscopy study of the dentin-glass ionomer cement interface.
OBJECTIVE
The work was carried out with a view to identifying the elements composing the glass ionomer under study, and then to characterising the interactions occurring between this particular glass ionomer and the dentin substrate on which it was placed and with which it interacted.


METHODS
The samples studied were sections of healthy human dentin on which a very thin film of auto-polymerisable cement, composed of a powder and a liquid, was deposited under para-clinical conditions. After separation, the interfaces on the dentin side and on the glass ionomer side were studied using X-ray Photoelectron Spectroscopy (XPS).


RESULTS
This study showed that the dentin and glass ionomer cement exchanged mineral and organic elements. The acid contained in the liquid showed a certain degree of aggressivity, despite the presence of the glass ionomer. The dentin protein was, in fact, rapidly denuded from the very first minute. Migration of the mineral elements from one substrate to the other led to the formation of an intermediate layer on the surface of the materials.


CONCLUSIONS
This layer, which forms an interphase, enables the material to adhere to the dentin.
Sennou
H E
HE
Laboratoire de Biomatériaux, Faculté d'Odontologie, Toulouse, France. biomat1@cict.fr
Lebugle
A A
AA
Grégoire
G L
GL
D000328:Adult; D001840:Dental Bonding; D003804:Dentin / Q000737:chemistry* / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry; D004577:Electron Probe Microanalysis; D005459:Fluorides / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D013499:Surface Properties
D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; C084541:Fuji glass-ionomer lining cement; D005459:Fluorides