properties of impression compound

Impression materials are commonly classified by their elastic properties once set. Biological effects Specification No. 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. Impression Compounds (All Colors) 02/21/19 Page 3 of 6 Section 7. Bevan (1963) in a research about properties of impression compound selected 20 representative materials available from British. 5. Frederick C. Eichmiller, Carlos A. Muñoz-Viveros, in Contemporary Esthetic Dentistry, 2012. 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. Coefficient of thermal expansion 3. 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. Compound is trimmed so that 3 to 5 mm of clearance between compound and mucosa exists except in posterior palatal seal area. The basic properties of these cements and impression pastes are, to a large extent, reciprocal. 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. Brief History Of Clinical Development And Evolution Of The Procedure. 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. 6. 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. Tests were carried out according to ADA standard. separate cast from the impression, use warm water. Non-elastic materials are generally not used for taking impressions of crown preparations because of their inability to accurately record undercuts. Early investiga-tions2-7 were largely concerned with desirable compositions of mixtures for impression Thermal conductivity 2. Plaster, impression compound, zinc-oxide–eugenol, and other materials were originally developed as inelastic impression materials. Border Molding Complete dentures impressions & check cavity preparations 2. Fig 1-Flow change of compound with temperature 7. 1. – Often, polysulfide materials are called “rubber” or “rubber base” materials, even though polyether and silicone materials are also rubber materials. 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 The compound should be melted under infrared lamp and kneaded in water using a mixing hydrocoloid syring. This compound modification of the impression tray should be firmly adhering to the tray. What are the properties of thermoplastic impression compound? 1. Final impression is made either using zinc oxide eugenol or with a medium viscosity elastomer. - Type I compound is referred to as a true impression compound & is used for impressions of edentulous mouths. Compound impression can be added or corrected. Type 1 & Type. Dimensional change 4. 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Record undercuts the Procedure zinc oxide eugenol or with a medium viscosity elastomer edentulous mouths in!

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