Metals-to-composite dental adhesives based on diazonium chemistry
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1
McGill University, Faculty of Dentistry, Canada
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2
McGill University, Department of Mining and Materials Engineering, Canada
Objective: Composite resins do not adhere well to dental alloys. This can cause problems such as bracket debonding during orthodontic treatments and failures at the composite-metal interface in dental prostheses. The aim of this in vitro study was to develop a new surface treatment, based on diazonium chemistry that facilitates chemical bonding between metals and dental composite.
Methods: Two models of stainless steel brackets were coated with diazonium ions to allow covalent binding on their surfaces. The brackets were then immersed in an emulsion of Bis-GMA monomer and an initiator to polymerize the Bis-GMA on the surface of the diazonium layer. The chemical composition of the treated metal was analyzed by X-ray photoelectron spectroscopy (XPS) and the tensile and shear bonding strengths between Bis-GMA composite and surface-treated metallic orthodontic brackets were measured.
Results: XPS confirmed the presence of a diazonium/Bis-GMA coat on the treated metals; the bond strength between coated metals and Bis-GMA was 2 to 3.6 folds higher than the bond between untreated metals and Bis-GMA. After diazonium/Bis-GMA treatment, orthodontic brackets with bases perform better than the baseless brackets in the shear test but not in the tensile test.
Conclusion: The surface treatment method proposed in this study can be used to increase the bonding strength between dental alloys composite resin. Diazonium/Bis-GMA treatment is an effective surface treatment for achieving a strong chemical bond between metallic brackets and composite, which can help to reduce bracket debonding. This adhesive system can be utilized in several dental applications.
The authors would like to acknowledge King Saud University in Saudi Arabia, Riyadh; Natural Sciences and Engineering Research Council (NSERC) of Canada–Discovery grant; the Fondation de l’Ordre des dentists du Québec (FODQ); the Canada Research Chair Foundation; and Le Réseau de recherche en santé Buccodentaire et osseuse (RSBO) for their financial support.
Keywords:
in vitro,
composite,
Surface modification,
clinical application
Conference:
10th World Biomaterials Congress, Montréal, Canada, 17 May - 22 May, 2016.
Presentation Type:
Poster
Topic:
Biomaterials in dental applications
Citation:
Alageel
O,
Kozak
P,
Abdallah
M,
Retrouvey
J,
Cerruti
M and
Tamimi
F
(2016). Metals-to-composite dental adhesives based on diazonium chemistry.
Front. Bioeng. Biotechnol.
Conference Abstract:
10th World Biomaterials Congress.
doi: 10.3389/conf.FBIOE.2016.01.00714
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Received:
27 Mar 2016;
Published Online:
30 Mar 2016.