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Adhesive Systems (Ideal Bonding Agent Properties (High bond strength, Low…
Adhesive Systems
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Smear Layer
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Has an amorphous, irregular and granular appearance (very heterogenous)
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Components
Organic: heated coagulated proteins (gelatin formed by the deterioration of collagen heated by cutting temp), necrotic or viable pulp tissie, odontoblastic processes, saliva, blood, cells and microorganisms
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Disadvanatages
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In root canal walls, may interfere with adhesion and penetration of sealers into dentinal tubules
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Hybridization
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Steps
dentine is treated with conditioner --> exposes the collagen fibril network with fibrillar microporosities --> spaces are filled with low viscocity monomers when primer is applied
Layer is formed by demineralization of dentine and infiltration of monomer and subsequent polymerization
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Adhesive
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low viscosity resin, contained hydrophilic molecules that can penetrate inside dentine and hydrid layer --> bonds with primer and collagen fibres by MECHANICAL INTERLOCKING --> composite binds with adhesive chemically
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Primer
Vehicles for Primer
Water (dry technique)
too much water will make conc of primer very low so REMOVE water first then add the water based primer
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