class II composite Flashcards
Why are we using more composite?
Health/environmental concerns w amalgam
Minimata treaty 2013- reduce global release of mercury into environment
No amalgams under 15, pregnant, breast feeding
Aesthetic demands of patients
Demand to use adhesive that’s less invasive
Allergies to metal- lichenoid reaction to amalgam
What are contraindications to composite?
High caries activity Poor oral hygiene Adequate isolation difficult Multiple large restorations- cusp contacts Bruxism/grinding Allergies to constituents or bonding systems Cavity margins extend beyond enamel Time constraints
What is an ideal composite?
Load bearing Packable material High filler content >60% Hybrid materials Easy to manipulate Hold shape without slumping Good increments w/o voids Works under surgery lights Cost £4 per compule Shade range Presentation from compule
How should you select the shade?
Before isolation
Natural lighting
Tooth moist
Greater accuracy by applying test composite
Lighter shades cure more readily than darker
How might you achieve tight contact points?
Can’t condense composite so PREWEDGING can push teeth apart and return when finished
ORTHO SEPARATORS can be placed 3-7 days prior also
What types of matrices are available?
Sectional matrices and separation rings- good proximal contour and contact points, various sizes eg. palodent
Circumferential matrix systems- eg. Pro matrix, omnimatrix
Metal- burnished and tight contact, easier insertion
Clear- harder insertion, cure through, can’t be burnished
Light cure through
What is the configuration factor?
Ratio of bonded to unbonded surfaces of cavity
Smaller C factor reduces internal stresses
Class I- 5:1 = 5 Class II- 4:2 = 2 Class III- 3:3 = 1 Class IV- 2:4 = 0.5 Class V- 1:5 = 0.2
What is oblique layering?
Each layer should minimise contact with multiple surfaces of the tooth
What is bulk fill composite?
Can be cured up to 4mm Some sonic devices to alter viscosity Lower polymerisation shrinkage Increase adaptation Better aesthetics Better seal Eg. Kerr sonic fill2, dentsply sirona SDR
What does a radiometer do?
Light unit tested with this
Checks intensity of light cure
Diminishes over time
How can you finish/polish your restoration?
Microfine diamond burs Occlusion checked Soflex discs Enhance discs/cups Impregnated rubber points 50 micron Aluminium oxide pastes Surface glaze eg. unfilled polymers/staining techniques
