Specification No. - Type I compound is referred to as a true impression compound & is used for impressions of edentulous mouths. Early investiga-tions2-7 were largely concerned with desirable compositions of mixtures for impression 7. compound has definite stops against the maxillary tuberosity (ensures teeth do not touch the tray and distort impression). Biological effects The properties of duplicating and impression compounds, as influenced by storage for 3 days atelevated temperatures andby 12 boiling andcooling cycles wererecently reported by Duke and Ryge.2 The tests used in this study were those described in the A.D.A. Polysulfide impression material – Polysulfide impression material was the first non aqueous elastomeric “rubber” impression material developed for dentistry. Impression Compounds (All Colors) 02/21/19 Page 3 of 6 Section 7. – Often, polysulfide materials are called “rubber” or “rubber base” materials, even though polyether and silicone materials are also rubber materials. separate cast from the impression, use warm water. Rigid impressions (impression compound & zinc oxide eugenol) Coefficient of thermal expansion 3. Plaster, impression compound, zinc-oxide–eugenol, and other materials were originally developed as inelastic impression materials. 5. 1. Dimensional change 4. Type 1 & Type. Purpose of Impression Compound materials & the different types. Tests were carried out according to ADA standard. Impression materials are commonly classified by their elastic properties once set. Frederick C. Eichmiller, Carlos A. Muñoz-Viveros, in Contemporary Esthetic Dentistry, 2012. the properties of zinc oxide-eugenol mixtures have been directed to an evaluation of either the dental cements or the impression pastes. Bevan (1963) in a research about properties of impression compound selected 20 representative materials available from British. Thermal conductivity 2. 11 for Hydrocolloid Impression Material-Agar Type.3 Other properties: * Non-toxic or irritant * Suitable setting time * Long shelf life * Can be copper plated 2/23/2016 18 What are the properties of thermoplastic impression compound? 6. Final impression is made either using zinc oxide eugenol or with a medium viscosity elastomer. Secondary impression can be made by using low fusing impression compound (green stick) ; green stick compound is kneaded to a homogenous mass and is loaded on the special tray and border movements are implemented. Non-elastic materials are generally not used for taking impressions of crown preparations because of their inability to accurately record undercuts. Fig 1-Flow change of compound with temperature 1. Handling and Storage Precautions for Safe Handling: Avoid contact with eyes, skin and clothing.Always wear impervious gloves, chemical safety goggles and protective clothing when handling this material. Compound is trimmed so that 3 to 5 mm of clearance between compound and mucosa exists except in posterior palatal seal area. The basic properties of these cements and impression pastes are, to a large extent, reciprocal. Low- fusing or Impression compound/ Type I compound - Tray compound is used in the construction of dentures to form a tray that can be employed with other types of impression materials for reproducing the mouth tissues. As the material is reversible, it can be re-used, but after sterilization. The compound should be melted under infrared lamp and kneaded in water using a mixing hydrocoloid syring. Compound impression can be added or corrected. Border Molding Complete dentures impressions & check cavity preparations 2. 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