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amalgam composites are common in
lingual pits of elder patients
Indications for composite restoration
To replace composite or amalgam restorations
Contraindications
When the tooth cannot be adequately isolated
Advantages
- Esthetics - Tooth preparation less complex
- Preserve tooth structure
- Used almost universally
- Increase the strength of remaining tooth structure
- Repairable
Disadvantages
Polymerization shrinkage can create gaps
- More technique-sensitive
- Lower fracture toughness than indirect restorations
- Possible of greater wear
in real life preps (when referring to smoothness and size of the prep)
caries dictates the shape of the prep. floors and walls may not always be smooth, but the caries should always be removed
when should amalgam be removed
if the patient desires it or if caries formed around it
why does composite make the tooth stronger?
it is chemically bonded to the tooth
adhesive and cohesive fractures
A: during polymerization between the tooth and adhesive or adhesive and the tooth
C: in dentin bonding by itself or the composite
reasons to replace old composite
leakage, discoloration, secondary caries
Class III Composite restorations steps
Diagnosis
Checking the occlusion
Anesthesia and prophylaxis
Tooth color selection Field isolation
Cavity preparation
Proximal Caries Lesions
Caries in enamel Caries in dentin
Non-cavitated caries Cavitated caries Inactive caries
Active caries
refraction index of water, air and enamel
W: 1.33
A: 1
E: 1.62 (water and enamels close RI is why you cant see caries when the tooth is wet. closer the RI is between organic particles and inorganic filler, the better the light penetration and shade)