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Impression &Impression Materials in Implant Dentistry
DR MANSOUR RISMANCHIANAssociated professor,Department of prosthodontics and Implant ,Dental school.Isfahan university of medical
sciences
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Type of Impression Fixture Level Abutment Level
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Type of Impression • open Tray • Close Tray
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Type of Impression -Custom Tray {one step, Two step} -Stock Tray {one step,two step}
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Impression Materials setting
riversible
irriversible
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Polymerization(curing)
Addition curing(no by product)
Condensation curing
(by product)
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After setting
elastic
polysulphides Poly ethers silicones
rigide
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Selection of Impression material 1.personal preference 2.easy of manipulation 3.economic 4.color 5.easy of assessment
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Comparison of Impression Materials
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Setting time poly sulfide>silicons>poly ether
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Elasticity poly sulphide>poly ether>Additional silicons>condensational
silicons
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Hardness polyether>Additionalsilicons>
condensational silicons>poly sulfide
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Flow polyether>silicon>polysolfid
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Tear strenght polysolfid>silicon>polyether
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Dimentional stability Additionals>polyether>polysolfid>condensationals
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Technique of mixing -stirring -stropping -automixer
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Type of Rubber base materials 1.elastic -light body -heavy body -regular body –putty
2.rigid -heavy
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Disinfection of Impression -immersion -spray
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Disinfection materials -chlorine compounds -complexphenolics -Golutaraldehyde%2 -Iodophors -Alchol phenolics
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Impression with silicones
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THANK YOU FOR YOUR ATTENTION