Chapter 10 Flashcards
Definition of alloy
mixture of two or more metals
Definition of high-noble alloy
alloy containing at least 60% noble metals, 40% of which must be gold
Definition of base-metal alloy
alloy composed of non-noble metals (corrodes more readily)
Definition of noble alloy
alloy composed of metals that do not corrode readily
Definition of precious metal
classification of metal based on its high cost
Definition of porcelain bonding alloys
special casting alloys manufactured for their compatibility with porcelain that has been bonded to them at high temperatures
Definition of coping
thin covering like a thimble that serves as substructure for a porcelain-bonded-to-metal crown
Definition of firing
process of heating porcelain at high temperature until it fuses
Definition of sintering
process whereby particles are heated to the point that they fuse together at their borders but do not clump into one solid mass
Definition of yield strength
amount of stress at which a substance deforms
Definition of glazing
firing porcelain at high temperature to achieve a smooth, shiny surface
Definition of solder
alloy used to join two metals together or two repair cast metal restorations
Definition of wrought metal alloy
alloy that has been mechanically changed into another form to improve its properties
Definition of anneal
modify physical properties of a metal by heating it
Definition of nitinol
alloy of nickel and titanium often used for orthodontic wires
Definition of gauge
measure of the thickness of a wire; lower the gauge, thicker the wire
Definition of post
metal or nonmetal dowel placed within the root canal to retain a core buildup
Definition of active post
post that engages the root canal surface like a screw
Definition of passive post
post that sits in the prepared canal space but does not actively engage the root surface
Definition of custom post
post cast to fit precisely in the root canal space
Definition of pre-formed post
factory-made post supplied in several sizes
