Adobe Systems
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Restorative dentistry III. -feedback1

Adobe Systems
Principle of binding composite materials to hard dental tissues
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̶Micromechanical
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Adobe Systems
Principle of binding composite materials to hard dental tissues
Describe the principle of micromechanical retention in enamel:
Acid etching creates microscopic spaces between enamel rods or in them
The bond flows inside and copolymerizates with the filling materiál.
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Adobe Systems
Principle of binding composite materials to hard dental tissues
̶Describe the principle of micromechanical retention in dentin:
̶Acid etching removes smear layer, open dentin tubules and decalcifyies the surface layer of
dentin.
̶What are problems in dentine in comparison to enamel tegarding the bonding?
̶Doferences: less amount of minerals, always wett, variable composition.
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Adobe Systems
How do boding agents work in dentin?
̶Primer is necessary
̶What is primer?
A mixture of resins in a solvant (aceton, alcohol, water, alcohol plus water).
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Adobe Systems
How do boding agents work in dentin?
-How does primer work?
Amphiphilic character (hydrophilic and hydrophobic part) – flows into dentin (tubules and spaces
between collagen fibres), the solvant evaporates and the hydrophobic part copolymerizes with the
composite material
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Adobe Systems
̶Bond is necessary for enamel
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̶Primer and bond are necessary in dentin
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̶They can be together i one bottle
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Adobe Systems
Selfetching adhesives – how many steps?
̶Acidic primer
̶No washing
̶Variable pH – different thickness of the hybrid layer.
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What the hybrid layr is ?
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Adobe Systems
Step by step procedure – composite filling using acid etching
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Adobe Systems
Step by step procedure – composite filling using selfetching adhesive systems
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Adobe Systems
Glassionomer – composition, principle of retention
̶Aluminium silicate glass
̶Polymeric acid (polyacrylic, polymaleic)
water, tartaric acid
Principle of seting:
Acid – base reaction
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Adobe Systems
Step by step rpocedure – glassionomer filling
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