impression materials
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| Types of Impression materials | inelasticelasticelastomers
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| Uses of Inelastic materials | edentulous impressionsbite registrations
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| Typesof Inelastic Impression materials | impression plastercompoundZOE
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| Physical changes of Compound Impression Materials | compound water bathbunsen burner
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| uses of ZOE as an impression material | secondary impression for denturesbite registration
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| Types of elastic impression material | hydrocolloidselastomers
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| Types of Hydrocolloids | reversible and irreversible
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| types of elastomers | polysulfide, condesation silicone, polyethers, olyvinylsiloxane
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| uses of reversible hydrocolloids | final impression crown and bridge
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| Chemical reactions of reversible hydrocolloid | physical change sol----> gel by heat
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| Composition of Reversible hydrocolloid: Agar | sol to gel
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| Composition of Reversible hydrocolloid:Borax | strength
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| Composition of Reversible hydrocolloid:potassium sulfate | setting of gypsum
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| Composition of Reversible hydrocolloid:benzoates | preservative
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| Composition of Reversible hydrocolloid:additive water | to balance
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| Advantages of Reversible Hydrocolloids | CostUsable in a wet environmenet
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| Disadvantages to a reversible hydrocolloid | suneresisimbibitioncross contaminations
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| Uses of polysulfides | final impression crown and bridgefinal impression dentures
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| Chemical Reaction of Polysulfides | polymerization
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| Uses of condensation silicone | final impression crown and bridgefinal impression denture
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| Chemical Reaction of Codensation silicone | polymerization
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| Uses of polyvinylsiloxane | final impression crown and bridgefinal impression denturebite registration
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| Chemical Reaction of Polyvinylsiloxane | polymerization
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| uses of polyethers | final impression crown and bridgefinal impression denturebite registration
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| Chemical reaction of polyethers | polymerization
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