Nickel alloys in the oral environment.

Expert review of medical devices (2013-07-31)
John C Wataha, Jeanie L Drury, Whasun O Chung
RESUMEN

The use of nickel casting alloys for long-term restorations in dentistry has long been controversial. A 'tug-of-war' between economic, engineering and biological considerations is central to this controversy; nickel-casting alloys have low costs and favorable physical properties, but are corrosion-prone in the oral environment. Clinicians and researchers have questioned the safety of nickel-containing dental alloys because several nickel compounds are known to cause adverse biological effects in vivo and in vitro in contexts outside of dentistry. The debate revolves around the extent to which corrosion products from oral restorations cause intraoral or systemic biological problems. Current evidence suggests that nickel alloys may be used successfully and safely in dentistry if clinical risks are taken into account. However, these alloys may cause significant clinical problems, primarily allergenic and inflammatory, if the risks are ignored.

MATERIALES
Referencia del producto
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Descripción del producto

Sigma-Aldrich
Raney®-Nickel, W.R. Grace and Co. Raney® 2800, slurry, in H2O, active catalyst
Nickel, foam, 150x150mm, thickness 1.6mm, bulk density 0.45g/cm3, porosity 95%, 95%
Sigma-Aldrich
Nickel, powder, <50 μm, 99.7% trace metals basis
Sigma-Aldrich
Nickel, nanopowder, <100 nm avg. part. size, ≥99% trace metals basis
Sigma-Aldrich
Raney®-Nickel, W.R. Grace and Co. Raney® 2400, slurry, in H2O, active catalyst
Sigma-Aldrich
Nickel, foil, thickness 0.125 mm, ≥99.9%
Sigma-Aldrich
Nickel, powder, <150 μm, 99.99% trace metals basis
Sigma-Aldrich
Raney®-Nickel, W.R. Grace and Co. Raney® 4200, slurry, in H2O, active catalyst
Sigma-Aldrich
Nickel, wire, diam. 0.25 mm, ≥99.9%
Sigma-Aldrich
Nickel, foil, thickness 0.5 mm, 99.98% trace metals basis
Sigma-Aldrich
Nickel, powder, <1 μm, 99.8% trace metals basis
Sigma-Aldrich
Nickel, foil, thickness 0.1 mm, 99.98% trace metals basis
Sigma-Aldrich
Raney®-Nickel, W.R. Grace and Co. Raney® 3202, slurry, in H2O, active catalyst
Sigma-Aldrich
Nickel, wire, diam. 0.5 mm, ≥99.99% trace metals basis
Sigma-Aldrich
Nickel, wire, diam. 0.5 mm, ≥99.9% trace metals basis
Sigma-Aldrich
Nickel, foil, thickness 0.25 mm, 99.995% trace metals basis
Sigma-Aldrich
Nickel, rod, diam. 6.35 mm, ≥99.99% trace metals basis
Sigma-Aldrich
Nickel, sputtering target, diam. × thickness 2.00 in. × 0.25 in., 99.95% trace metals basis
Nickel, mesh, 100x250mm, nominal aperture 0.73mm, wire diameter 0.25mm, 26x26 wires/inch, open area 55%, plain weave mesh, 99%
Nickel, rod, 100mm, diameter 3.3mm, 99.99+%
Nickel, rod, 100mm, diameter 16mm, 99.99+%
Nickel, wire reel, 10m, diameter 0.01mm, as drawn, 99.98%
Nickel, foil, not light tested, 100x100mm, thickness 0.01mm, 99.95%
Nickel, wire reel, 250m, diameter 0.25mm, annealed, 99%
Nickel, wire reel, 1m, diameter 1.0mm, hard, 99.98%
Nickel, wire reel, 20m, diameter 0.125mm, hard, 99.98%
Nickel, rod, 100mm, diameter 3.0mm, 99%
Nickel, broken cathode squares, 1000g, max. size 50mm, 99.8%
Nickel, tube, 1000mm, outside diameter 6.5mm, inside diameter 5.5mm, wall thickness 0.5mm, hard, 99.5%
Nickel, foil, 50mm disks, thickness 0.05mm, annealed, 99%