Clinical Composite Flashcards
What will happen if caries are left at the amelodentinal junction?
It results in unsupported enamel and early breakdown of the restoration margin if microleakage occurs
How do you avoid enamel fracture?
Cavity design, etch times, washing, curing protocol
What type of dentine is favourable for the hybrid layer creation?
Primary dentine
What does a high configuration factor mean?
Increased polymerisation contraction stress
What does a low configuration factor mean?
Reduced polymerisation contraction stress
What is the definition of configuration factor?
Ratio of bonded to unbonded surfaces
What is plasticity
A property of a material to undergo a non-reversible change of shape in response to an applied force
What is deformation
A change in shape due to an applied force
What is the purpose of flowable composite?
It mediates contraction stresses on interface and to achieve optimal adaption to non-load bearing margins
What is the main reason for reduced shrinkage stress?
Decreased final conversion
What is shrinkage direction determined by?
Bonded surfaces and free surfaces
What properties will the ideal restorative materials have?
Mechanical - strength rigidity hardness
Bonding capability
Thermal properties
Aesthetics
Good handling
Anti-cariogeneic
Radiopaque
Polishable
Biocompatible
What are the components of composite resin?
Filler particles
Resin
Camphoquinone
Low weight dimethacrylates
Silane coupling agent
What is the effect of adding filler to composite?
Less shrinkage
Higher viscosity
Lowe shrinkage
Improved aesthetics
Lower thermal expansion
What resin monomer is typically used in composite?
BIS-GMA
