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