Comoosites
Chemically bonded mixture of organi matrix (resin) ane inorganic filler
Composition
Organic phase - resin
Bowen's monomer - bisfenol A a
glycidylmetacrylate- Bis GMA
Other dimetacrylate
UDMA
TEGMA
•
Composition
Inorganic phase - filler
Milled qua
Baryumaluminium glass Silica
Prepolymer
3
•
■
4
Composition
• Initiatory system initiator a activator
• Stabilizers
• Pigments
• UV absorbers
• Antioxidants
Curing of composites
Polymerization Activator
Iniciator
Splitting of double bonds
Creation of the polymer network
5
Composite according to mode
of curing
eD Chemically curing oDLight curing sD Dual curing eDWarm curing
Light
Polymerization
Monomer
O o
Polymer
Classification according to size of fillers
Macrofillers
Microfillers
Hybrid
Use of Composites
• Aesthetic restorations
• - class III., IV., V., I., II.
h structures
Ablation of
the aprismatic enamel
Acid etching
Dentin
o More water and organic substances o Low surface energy o Tubular liquid
o Comunication with the pulp chamber o Smear layer
Bonding to the tooth structures
Dentin
Removing of the smear layer
Acid etching
Konditioner
Demineralization
Increase of the surface energy
Phosphoric acid
Primer
Opening og the collagen network of dentin
Bond
Penetrates into the retentive pattern in enamel and the collagen network of dentin (hybrid layer)
•
Glasionomer cements
* Composition
Powder: asluminiumsilicate glass
Tekutina:
Polyacrylic acid or polymaleic acid Tartaric acid
Water
Curing of GIC
Aluminium calcium polyacryla
•
Properties
> Chemical fixation to tooth structure
> Fluoride release \^
> Favorable thermal expansion
> Acceptable aesthetics
GIC accordina to mode of
> Chemically curing (acid - base reaction
> - conventional
> - high strength
> Light curing (acid -base reaction +
olymerization of the resin
GIC - indication
Class V, small class I., class III.
• Base - sandwich fillings
• Luting cements
• Root canal filling
•
IC
Hand mixing
Capsulated