Restoration of cavities with different materials Flashcards Preview

BDS 2: Adult Restorative > Restoration of cavities with different materials > Flashcards

Flashcards in Restoration of cavities with different materials Deck (9)
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1

What percentage of fractured teeth had been previously restored?

92% of fractured teeth been previously restored

2

Describe the events leading to a fracture of a restored tooth (5)

- Deflection of cusp weakened by restoration
- Open interface between
restoration and tooth
- Microleakage
- Recurrent caries
- Fracture

3

Comment on the fracture resistance of a restored tooth

The fracture resistance of the restored tooth is lower than of the unrestored regardless of the cavity shape and restoration material

4

What can high stress at the tooth restoration interface cause?

Cause crack propagation and fatigue failure on mastication

5

What is photoelasticity?

How does it work?

How is stress seen in this?

- Stress analysis technique using 2 indexes

- Ray of light passing through a birefringent material experiences two refractive indices

- Stress is seen as fringes

6

What is finite element analysis?

Computer modelling technique of stress distribution

7

Where will cracks occur in bonded restorations?

Within the enamel in contact to the opposing tooth

8

Where will cracks occur in non-bonded restorations?

Internal line angles and EDJ

9

What considerations should be taken when applying a restoration?

Stress?
Shape?

- Stress should be uniform and minimised along the interface

- No sharp edges and corners
- Bigger curvature radius of the base