7 - Waxes

Question 1

7.2 - Are waxes thermoset or thermoplastic materials?

Answer 1

They are thermoplastic

Question 2

7.9 - Waxes have a large ability to expand in volume in response to temperature - what do you call this property and what explains why waxes have this property?

Answer 2

Thermal expansion

They have a high degree of thermal expansion due to their weak secondary valence forces and transition points.

Question 3

7.14 Define residual stress

Answer 3

They are internal stresses independent of applied forces - usually a result of non-uniform heating and cooling

Question 4

7.26 What properties do all waxes have?

Answer 4

1. All have a melting range (not a single melting point)
2. All have a tendency to flow
3. All possess residual stresses
4. All have the largest CTE of all dental materials (coefficient of thermal expansion)