L7: Restoration of Cavities With Different Materials

Question 1

When do teeth fracture?

Answer 1

When the fracture resistance of the restored tooth is lower than the unrestored (regardless of cavity shape and restorative material)

There is high stress at the tooth-restoration interface can cause crack-propagation and fatigue failure on mastication

Question 2

How does amalgam adhere to the tooth structure?

Answer 2

Mechanical structure
(2mm min depth required)

Question 3

Why does incremental light cure have a low level of stress

Answer 3

Stress levels disapate as the different layers have stress travelling in different directions