- Shiny, electrical conductors (stiff and strong)
-No natural metals used in body
Titanium (with O)
Platinum (with Ir)
- Mixtures of metals that can contain small amounts of non-metals
Stainless Steel (Fe + Cr)
Titanium (with 6% Al and 4% V)
Cobalt-Chrome (Co+Cr, Mo)
Amalgam (Ag, Hg, Sn)
-Used for knees, hips, dental, stents, and Pt for pacemakers
- Large molecules with repeating sub-units, usually organic (C-based)
and in the form of a large (sometimes branched) chain.
Chains are separated.
Material will soften and flow upon heating but resolidifies upon
Ex: Polyethylene, Polymethyl methacrylate (PMMA), Polyester
Chains are linked into 3D network-huge molecule.
Cannot be melted.
Ex: Cyanoacrylate (super glue), dental resins
Chains are loosely linked.
Doesn’t melt or dissolve.
Soft and strechable.
May swell in solvent.
Ex: Polyurethane, silicone
Proteins - Bioactive (enzymes) and Structural (collagen, keratin,
Starch, Cellulose, Polysaccharides (DNA, RNA)
Ceramics and Glasses
- Crystalline material including all oxides and many other
compounds like nitrides and carbides.
Ex: Porcelain, cement, quartz, silicon carbide, boron nitride, and
Alumina (Al203) - Inert hard material
Zirconia (ZrO2) - Less brittle with 5-10% yttria
Hydroxyapatite (HAP) - Natural ceramic used by the body in teeth
Used for bioceramic coatings of metal implants.
- Any disordered material.