Wax Patterns

Question 1

List the factors increasing cement space:

Answer 1

1. Use of die spacers
2. Use of internal layer of soft wax in wax pattern
3. Increase polymerisation & thermal shrinkage of impression material (
4. Increase expansion of investment (more empty space=larger crown casted)
5. Removal of metal from fitting surface (grinding, airborne-particle abrasion, electrochemical milling, etching w aqua regia)