properties of impression compound

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

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