Desirable Properties Of Wax Flashcards
The wax should be __________ when__________. It should be compounded with ingredients that blend with each other so that there are no granules or the surface and no hard spots within the surface when the wax is softened.
Uniform, softened
The _______ should contrast with thy materials or prepared teeth. Since it is necessary to carve the wax margins against the die surface, the wax must is exhibit a definite contrast in color and sufficient opacity in thin layers to facilitate proper finishing of the margins.
Color
The wax should not ____________________ or similar surface particles when it is molded after softening such flakiness is likely to be present in paraffin wax so ____________ must be added to minimize this effect.
Fragment into flakes
Modifiers
Once the wax pattern has solidified it is necessary to _________ the original tooth anatomy and the margins so that the pattern conforms precisely to the surface of the die.
The latter procedure sometimes requires that the wax be carved to a very thin layer. The wax must not be pulled away by the carving instrument or trip as it is carved or such position cannot be achieved.
Carve
For lost wax casting of metals an ____________mold is formed around a wax pattern after the mold containing the wax pattern has been formed the wax pattern must be eliminated from the mold.
Investment
This is usually accomplished by heating the mold to melt and ignite the wax. If the wax leaves a residue or an impervioud coating on the walls of the mold, the cast metal in they may be adversely affected.
Elimination of the sprued wax pattern
True or false.
The wax should burn out completely by oxidizing residual carbon to volatile gases. Ideally when wax melts and is vaporized at 500°C, itt should not leave a solid residue that amounts to more than 0.10% of the original weight of the specimen.
True
True or false.
The wax should burn out completely by oxidizing residual carbon to volatile gases. Ideally when wax melts and is vaporized at 500°C, itt should not leave a solid residue that amounts to more than 0.10% of the original weight of the specimen.
True
The expansion and shrinkage of casting wax are?
Extremely sensitive to temperature
True or false.
Soft wax shrinks more than hard wax.
True
True or false.
High shrinkage wax may cause significant pattern distortion when it solidifies. It is necessary to avoid excessive shrinkage and expansion caused by a temperature change.
True
What is added to a certain wax formulation to control excessive shrinkage and expansion?
Organic filler
True or false.
Such fillers should be completely miscible with the components of the inlay wax during manufacture and they should not leave an undesirable residue after burnout.
True
