Chapt 10 Wax, Casting Investment And Casting Procedures

Question 1

Baseplate wax

Answer 1

Dental wax provided in sheet form to establish the initial arch form in the construction of complete dentures. contains approximately 75% paraffin or other waxes, and resins.

Question 2

Bite wax

Answer 2

A wax form used to record the occlusal surfaces of teeth, aid in establishing maxillomandibular relationships.

Question 3

Boxing wax

Answer 3

A wax sheet form used as a border at the perimeter of an impression to provide an enclosed boundary for the base of the cast to be made from a poured material such as gypsum or resin.

Question 4

Burnout

Answer 4

Process of heating an invested mold to eliminate the embedded wax or plastic pattern.

Question 5

Corrective wax = dental impression wax)

Answer 5

A thermoplastic wax that is used to make a type of dental impression.

Question 6

Dental wax

Answer 6

1. A low-molecular-weight ester of fatty acids derived from natural or synthetic components, such as petroleum derivatives, that soften to a plastic state at a relatively low temperature.
2. A mixture of two or more waxes and additives used as an aid for the production of gypsum casts, production of nonmetallic denture bases, registering of jaw relations, and laboratory work.

Question 7

Direct wax technique

Answer 7

A process whereby a wax pattern is prepared in the mouth directly on prepared teeth.

Question 8

Divesting

Answer 8

Process of removing investment from a cast metal or hot-pressed ceramic.

Question 9

Indirect wax technique

Answer 9

Procedure in which a wax pattern is prepared on a die.

Question 10

Elastic memory

Answer 10

Tendency of a solid wax form to partially return to its original shape when it is stored at a higher temperature than that to which it was cooled.

Question 11

Inlay wax

Answer 11

A specialized dental wax that can be applied to dies to form direct or indirect patterns for the lost-wax technique, which is used for the casting of metals or hot pressing of ceramics.

Question 12

Flow

Answer 12

Relative ability of wax to plastically deform when it is heated slightly above body temperature.

Question 13

Hygroscopic expansion

Answer 13

Amount of setting expansion that occurs when a gypsum-bonded casting investment is immersed in water, which is usually heated to approximately 38 C.

Question 14

Refractory

Answer 14

Capable of sustaining exposure to a high temperature without significant degradation.

Question 15

Sprue

Answer 15

The mold channel through which molten metal or ceramic flows into a mold cavity.

Question 16

Sprued wax pattern

Answer 16

A wax form consisting of the prosthesis pattern and the attached sprue Network.

Question 17

Sticky wax

Answer 17

A type of dental wax that exhibits high adhesion to dry, clean surfaces when it is heated to a plastic condition.