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