Composition Of Dental Waxes Flashcards
True or false.
Most dental waxes contain 40% to 60% paraffin by weight which is derived from high boiling fractions of petroleum they are composed mainly of a complex mixture of hydrocarbons of the methane series together with minor amounts of amorphous and microcrystalline phases.
True
True or false
Paraffin that is used for type I waxes has higher melting point than the paraffin used for type II waxes
True
It is likely to flake when it is trimmed and it does not produce a smooth glossy surface which is a desirable requisite for an inlay wax
Paraffin wax
___________for dammar resin is a natural resin.
Gum dammar
It is added to the paraffin to improve the smoothness in molding and to render it more resistant to cracking and flaking it also increases the toughness of the wax and enhances the smoothness and luster of the surface
Gum dammar
This wax occurs as a fine powder on the leaves of certain tropical palms. This wax is very hard and it has a relatively high melting point and it has an agreeable odor it is combined with the paraffin to decrease flow of at mouth temperature.
Carnauba wax
It contributes greater glossiness to the wax surface than the dammar resin.
Carnauba wax
This wax can also be added partially or entirely to replace carnauba wax. It provides the same general qualities as carnauba wax but its melting point is lower and is it is not as hard as carnauba wax.
Candelilla wax
This one may replace part of the paraffin to modify the toughness and carving characteristics of the wax.
Ceresin
Is typically a white wax extracted from ozokerite, a waxy mineral mixture of hydrocarbons that is colorless or white when pure, but it has someone unpleasant odor.
Ceresin
True or false.
Carnaval wax is often replaced in part by certain synthetic waxes that are compatible with paraffin wax at least two waxes of this type can be used. When is a complex nitrogen derivative of the higher fatty acids and the other contains esters of acids derived from montan wax, a derivative hard wax that is obtained by solvent extraction of certain types of lignite or brown coal approximately a third of all montan wax produced is used in automobile polishing pastes.
True
True or false.
For an impression compound, a synthetic wax is preferable to a natural wax because it has greater uniformity because of the high melting point of the synthetic waxes more paraffin can be incorporated to improve the general working qualities of the product.
True
