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Oper Dent. 2010 Jan-Feb;35(1):94-104. doi: 10.2341/09-076-L.

Microtensile bond strength and interfacial characterization of 11 contemporary adhesives bonded to bur-cut dentin.

Author information

1
Université Cheikh Anta DIOP, Faculté de Médecine, Pharmacie et Odontologie, Dakar, Senegal.

Abstract

OBJECTIVES:

This study evaluated mechanically and ultra-morphologically 11 different adhesive systems bonded to dentin.

METHODS:

The microtensile bond strength (microTBS) of 11 contemporary adhesives, including two three-step etch&rinse, three two-step etch&rinse, two two-step self-etch and four one-step self-etch adhesives to dentin, were measured. The resultant interfacial ultra-structure at dentin was characterized by transmission electron microscopy (TEM). Human third molars had their superficial dentin surface exposed, after which a standardized smear layer was produced using a medium-grit diamond bur. The selected adhesives were applied according to their respective manufacturer's instructions for microTBS measurement after storage in water at 37 degrees C for 24 hours or for TEM interfacial characterization.

RESULTS:

The microTBS varied from 11.1 to 63.6 MPa; the highest bond strengths were obtained with the three-step etch&rinse adhesives and the lowest with one-step self-etch adhesives. TEM evaluation showed very different interaction patterns, especially for the self-etch adhesives. "Mild" self-etch adhesives demineralized the dentin surface sufficiently to provide micro-mechanical retention, while preserving hydroxyapatite within the hybrid layer to enable additional chemical interaction.

CONCLUSIONS:

When bonded to dentin, the adhesives with simplified application procedures (in particular, one-step self-etch adhesives) still underperform as compared to conventional three-step adhesives. "Mild" two-step self-etch adhesives that provide additional chemical bonding appear to most optimally combine bonding effectiveness with a simplified application protocol.

PMID:
20166416
DOI:
10.2341/09-076-L
[Indexed for MEDLINE]

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