Title: Bonding Effectiveness and Interfacial Characterization of a New Three-step Adhesive
Authors: Mine, Atsushi
Van Meerbeek, Bart
De Munck, Jan
Van Landuyt, Kirsten
Poitevin, André
Kuboki, Takuo
Yoshida, Yasuhiro
Suzuki, Kazuomi
Lambrechts, Paul #
Issue Date: Sep-2007
Host Document: Journal of Dental Research vol:87 issue:Spec Iss B
Conference: annual meeting of IADR-Continental European and Israeli Divisions edition:42 location:Thessaloniki date:26-29, Sept 2007
Article number: 0470
Abstract: Objectives: The new three-step adhesive 'cmf adhesive system' (CMF, Saremco) is free of co-monomers such as TEGDMA and HEMA for biocompatibility reasons, for instance in prevention of allergic reactions of patients and dental staff. The purpose of this study was 1) to determine the micro-tensile bond strength (µTBS) to enamel/dentin, and 2) to characterize its interfacial interaction with enamel/dentin using transmission electron microscope (TEM).

Methods: Twelve intact freshly extracted human third molars were used for µTBS. Optibond FL (OBFL, Kerr) served as control. After bonding procedures following the respective manufacturer's instructions and subsequent composite build-up (Z100, 3M ESPE), specimens were sectioned to 1.8x1.8 mm sticks and trimmed at the interface to a cylindrical hour-glass shape (±1.2 mm) using the MicroSpecimen Former (University of Iowa). TEM non-demineralised and demineralised sections, and sections of specimens immersed in ammoniacal silver nitrate were prepared by ultra-microtomy and examined (EM 900, Zeiss).

Results: µTBS
p-value (t-test)

30.7 ± 9.2 MPa, n=10
26.7 ± 5.0 MPa, n=11

25.7 ± 5.8 MPa, n=10
45.6 ± 9.9 MPa, n=10

No pre-testing failures were recorded.

TEM showed a tight interface at enamel. The etch-pits produced by the 'mild' phosphoric-acid conditioner (pH=1.5) were rather shallow, but resulted in clearly defined micro-tags. A relatively thick, completely demineralised and acid-resistant hybrid layer was formed, varying in thickness between 1.5-3 µm at dentin. The dentin tubules were opened and enabled the formation of resin tags. Some degree of spot and cluster-like nanoleakage was observed, but did not differ in extent and form in comparison to that observed with the OBFL control.

Conclusion: The new three-step adhesive 'cmf adhesive system' showed clear indications of good bond reliability.
Publication status: submitted
KU Leuven publication type: IMa
Appears in Collections:Biomaterials - BIOMAT
Clinical Residents Dentistry
Department of Oral Health Sciences - miscellaneous
# (joint) last author

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