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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Eliades, G.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2017Comparative analysis of the mechanical properties of fiber and stainless steel multistranded wires used for lingual fixed retentioncitations
- 2016Viscoelastic properties of orthodontic adhesives used for lingual fixed retainer bondingcitations
- 2013Interactions of dentine desensitisers with human dentine: morphology and composition.citations
- 2010Surface characterization of zirconia dental implantscitations
- 2010A metallurgical characterization of ten endodontic Ni-Ti instruments: Assessing the clinical relevance of shape memory and superelastic properties of Ni-Ti endodontic instruments
- 2009Surface characterization and force relaxation of retrieved silk suturescitations
- 2007Surface characterization of precious alloys treated with thione metal primerscitations
- 2003Multi-technique characterization of retrieved bone cement from revised total hip arthroplastiescitations
- 2000Light intensity effects on resin-composite degree of conversion and shrinkage strain
- 2000Degree of cure of orthodontic adhesives with various polymerization initiation modes
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article
Surface characterization of precious alloys treated with thione metal primers
Abstract
Objectives: To characterize the effect of two thione metal primers with phosphate groups on the surface morphology and composition of two noble prosthodontic alloys. Methods: Cast specimens from Argen 81(Au-Pd) and Argipal (Hi-Pd) alloys which were ground, polished and ultrasonicated in water, were divided in two groups (2 × 3) and treated with single layers of Alloy Primer (AP) and Metal Primer II (MP) primers respectively. The treated alloy surfaces were washed off with acetone and then examined by polarized light microscopy (PLM), reflection FTIR microspectroscopy (FTIRM) and X-ray photoelectron spectroscopy (XPS). Results: After AP treatment, PLM revealed a crystalline phase (VBATDT) dispersed in an amorphous phase (MDP plus soluble VBATDT) on both the alloys tested. MP demonstrated a fibrial arrangement with the most dense structure found on the Hi-Pd alloy. FTIRM failed to clearly resolve the presence of {single bond}S{single bond}H peaks on alloy surfaces. Moreover, {single bond}NH and {single bond}P{double bond, long}S peaks were identified denoting the presence of original thione tautomers. In both primers, phosphates were detected in a dissociative state ({single bond}PO32-). FTIR molecular mapping confirmed separation of VBATDT from MDP and MEPS from residual MMA. XPS showed that on alloy surfaces approximately 50% of sulphur was in the sulphide state, the rest being organic sulphur. AP showed higher sulphide percentage than MP on both alloys and higher sulphide percentage on the Au-Pd alloy (p <0.05). Clinical significance: Phase separation of the primer components on alloy surfaces may adversely affect their clinical performance. Sulphide formation on alloy surfaces was confirmed only by XPS under ultra-high vacuum and not by environmental techniques like FTIR; this poses serious questions on the chemical bonding capacity of these primers with the noble alloys tested under environmental conditions. © 2006 Academy of Dental Materials.