properties of impression compound

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

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