A<unk> , lancet, or bistoury is a small and extremely sharp bladed instrument used for surgery, anatomical dissection, podiatry and various arts and crafts (called a hobby knife).<unk> s may be single-use disposable or re-usable. Re-usable<unk> s can have permanently attached blades that can be sharpened or, more commonly, removable single-use blades. Disposable<unk> s usually have a plastic handle with an extensible blade (like a utility knife) and are used once, then the entire instrument is discarded.<unk>  blades are usually individually packed in sterile pouches but are also offered non-sterile. Double-edged<unk> s are referred to as "lancets".<unk>  blades are usually made of hardened and tempered steel, stainless steel, or high carbon steel; in addition, titanium, ceramic, diamond and even obsidian knives are not uncommon. For example, when performing surgery under MRI guidance, steel blades are unusable (the blades would be drawn to the magnets and would also cause image artifacts). Historically, the preferred material for surgical<unk> s was silver.<unk>  blades are also offered by some manufacturers with a zirconium nitride–coated edge to improve sharpness and edge retention. Others manufacture blades that are polymer-coated to enhance lubricity during a cut. Alternatives to<unk> s in surgical applications include electrocautery and lasers.
Scalpel
Earmold
Shine 
Sawbones 
Maxilla
Skull
Radium jaw
Pectus