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properties of impression compound

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