Elastic impression materials Non-elastic or Rigid Rubbers impression materials Hydrocolloid Polysulfide. Group discussion about Properties of Elastic Impression Materials (Synthetic Elastomers) Part 2 Impression materials are commonly classified by their elastic properties once set. Materials with di erent consistencies (heavy-, medium-, and light-body) were investigated. Many impression materials have an elastic recovery of more than 99%. The physical properties of compressive strength, tear strength, stress-strain properties, per cent set, crushing time, impression qualities, and gelation temperature were measured. The mechanical mixer improved elastic recovery and compressive strength of the alginate impression materials tested and had no effect on strain in compression and tear energy. Cresson3 suggested the revision of the testing procedure for compressive strengths of dental elastic impression materials that would apply the load at the rate of 18,000 Gm. ZOE Polyether. Dr Mumtaz ul Islam 11/3/2013 1 2. ⢠⢠⢠Resistance of a material to wear Resistance to penetration by an hard object Value of hardness is usually expressed in numbers 11/3/2013 2 3. In addition, the Materials and Methods. 12 vinylpolysiloxane, 2 polyether, and 3 hybrid vinylpolyether silicone-based impression materials were ⦠The viscoelastic properties of nine silicone-, polysulfide-, and polyether-based impression materials were determined using creep tests. Creep compliance measurements were shown to be effective in characterizing the elastic, retarded elastic, and viscous properties of polysulphide, silicone, and polyether impression materials. â It has the same setting reacti on and properties as the gypsum products that are us ed for models and casts. Impression materials, that is, the materials used to get an idea about the shape of teeth and the alveolar ridges, can be categorized as nonelastic and elastic materials. Viscoelastic properties of elastomeric impression materials: polysulphide, silicone and polyether rubbers. Although new elastomeric impression materials have been introduced into the market, there are still insufficient data about their mechanical features. Ease of Handling:Along with this they have excellent dimensional stability due to 99% of elastic recovery. [Elastic properties of impression materials and their dependence on testing conditions] Franz T. Dtsch Zahnarztl Z, 27(7):604-609, 01 Jul 1972 Cited by: 0 articles | PMID: 4504807. Materials and Methods Tensile strength at break (TSb), yield strength (YS), ulti- CHEMISTRY. 2. An impression material sustains some deformation as it is removed from the mouth but it must rebound to its pre- removal dimensions. Non-Elastic Impression Materials. They are easy to handle and their accuracy is pretty good. Silicone and polyether derivatives showed their best elastic properties immediately after mixing. The creep compliance curves, recovery, and per-cent set were calculated. Some years later.in the mid 1920's, agar hydrocolloid impression material was introduced as the first elastic impr~ssion material. The ADA recommends elastic recovery greater than 96.5%.
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