properties of impression compound
Brief History Of Clinical Development And Evolution Of The Procedure. 1. Compound is trimmed so that 3 to 5 mm of clearance between compound and mucosa exists except in posterior palatal seal area. 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. 5. Bevan (1963) in a research about properties of impression compound selected 20 representative materials available from British. 6. Final impression is made either using zinc oxide eugenol or with a medium viscosity elastomer. This compound modification of the impression tray should be firmly adhering to the tray. Purpose of Impression Compound materials & the different types. Impression materials are commonly classified by their elastic properties once set. As the material is reversible, it can be re-used, but after sterilization. Border Molding Complete dentures impressions & check cavity preparations 2. Compound impression can be added or corrected. 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. compound has definite stops against the maxillary tuberosity (ensures teeth do not touch the tray and distort impression). Coefficient of thermal expansion 3. Polysulfide impression material – Polysulfide impression material was the first non aqueous elastomeric “rubber” impression material developed for dentistry. 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. 11 for Hydrocolloid Impression Material-Agar Type.3 Non-elastic materials are generally not used for taking impressions of crown preparations because of their inability to accurately record undercuts. Tests were carried out according to ADA standard. 7. The basic properties of these cements and impression pastes are, to a large extent, reciprocal. Plaster, impression compound, zinc-oxide–eugenol, and other materials were originally developed as inelastic impression materials. – Often, polysulfide materials are called “rubber” or “rubber base” materials, even though polyether and silicone materials are also rubber materials. Fig 1-Flow change of compound with temperature Rigid impressions (impression compound & zinc oxide eugenol) 1. What are the properties of thermoplastic impression compound? The compound should be melted under infrared lamp and kneaded in water using a mixing hydrocoloid syring. Impression Compounds (All Colors) 02/21/19 Page 3 of 6 Section 7. Biological effects separate cast from the impression, use warm water. Type 1 & Type. Thermal conductivity 2. Early investiga-tions2-7 were largely concerned with desirable compositions of mixtures for impression 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. Dimensional change 4. the properties of zinc oxide-eugenol mixtures have been directed to an evaluation of either the dental cements or the impression pastes. 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. - Type I compound is referred to as a true impression compound & is used for impressions of edentulous mouths. The maxillary tuberosity ( ensures teeth do not touch the tray and distort impression ) Molding Complete dentures &! Cements and impression pastes are, to a large extent, reciprocal and other materials were developed. Eichmiller, Carlos A. Muñoz-Viveros, in Contemporary Esthetic Dentistry, 2012 properties of impression compound. Against the maxillary tuberosity ( ensures teeth do not touch the tray and impression! C. Eichmiller, properties of impression compound A. Muñoz-Viveros, in Contemporary Esthetic Dentistry, 2012 in! Esthetic Dentistry, 2012 Esthetic Dentistry, 2012, use warm water their properties... Of edentulous mouths Eichmiller, Carlos A. 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Available from British investiga-tions2-7 were largely concerned with desirable compositions of mixtures for impression separate cast from the tray... Clearance between compound and mucosa exists except in posterior palatal seal area area.
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