Flashcards in Restoration of cavities with different materials Deck (9)
What percentage of fractured teeth had been previously restored?
92% of fractured teeth been previously restored
Describe the events leading to a fracture of a restored tooth (5)
- Deflection of cusp weakened by restoration
- Open interface between
restoration and tooth
- Recurrent caries
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
What can high stress at the tooth restoration interface cause?
Cause crack propagation and fatigue failure on mastication
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
What is finite element analysis?
Computer modelling technique of stress distribution
Where will cracks occur in bonded restorations?
Within the enamel in contact to the opposing tooth
Where will cracks occur in non-bonded restorations?
Internal line angles and EDJ