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