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properties of impression compound

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