the properties of zinc oxide-eugenol mixtures have been directed to an evaluation of either the dental cements or the impression pastes. Final impression is made either using zinc oxide eugenol or with a medium viscosity elastomer. Frederick C. Eichmiller, Carlos A. Muñoz-Viveros, in Contemporary Esthetic Dentistry, 2012. The basic properties of these cements and impression pastes are, to a large extent, reciprocal. - Type I compound is referred to as a true impression compound & is used for impressions of edentulous mouths. Bevan (1963) in a research about properties of impression compound selected 20 representative materials available from British. – Often, polysulfide materials are called “rubber” or “rubber base” materials, even though polyether and silicone materials are also rubber materials. Fig 1-Flow change of compound with temperature Early investiga-tions2-7 were largely concerned with desirable compositions of mixtures for impression Specification No. 6. 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. Compound impression can be added or corrected. 1. compound has definite stops against the maxillary tuberosity (ensures teeth do not touch the tray and distort impression). Plaster, impression compound, zinc-oxide–eugenol, and other materials were originally developed as inelastic impression materials. Other properties: * Non-toxic or irritant * Suitable setting time * Long shelf life * Can be copper plated 2/23/2016 18 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. Polysulfide impression material – Polysulfide impression material was the first non aqueous elastomeric “rubber” impression material developed for dentistry. 1. 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. What are the properties of thermoplastic impression compound? 5. Thermal conductivity 2. separate cast from the impression, use warm water. Border Molding Complete dentures impressions & check cavity preparations 2. Brief History Of Clinical Development And Evolution Of The Procedure. Rigid impressions (impression compound & zinc oxide eugenol) Coefficient of thermal expansion 3. Non-elastic materials are generally not used for taking impressions of crown preparations because of their inability to accurately record undercuts. Impression materials are commonly classified by their elastic properties once set. Purpose of Impression Compound materials & the different types. Biological effects Type 1 & Type. Compound is trimmed so that 3 to 5 mm of clearance between compound and mucosa exists except in posterior palatal seal area. 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. Tests were carried out according to ADA standard. 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. Impression Compounds (All Colors) 02/21/19 Page 3 of 6 Section 7. Dimensional change 4. 7. This compound modification of the impression tray should be firmly adhering to the tray. 11 for Hydrocolloid Impression Material-Agar Type.3 Are, to a large extent, reciprocal I compound is referred to as a impression. 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