Elastomeric Impression materials: These are basically synthetic rubber based materials which were initially called as Rubber Impression materials but currently they are known as Non aqueous Elastomeric Impression materials. The material is used at a higher water/powder ratio (approximately 0.60) than is normally used for modelling plasters. Impression materials, introduction, classification and requirements, rigid impression materials dental material, Impression materials / dental implant courses by Indian dental academy. As an alternative an anti-expansion solution, containing potassium sulphate, borax and pigment, may be prepared and used with a standard white plaster. Here are the topics. Agar may be used but as discussed has a number of technical difficulties in its use. Non-aqueous elastomeric impression materials. The shape of the flabby ridge at rest is then recorded by painting plaster into its surface with a brush and keying this impression into the impression tray. It is therefore used for primary impressions … 4. -Very rigid and will break rather than bend -Absorb water from air. It is important to capture such tissue at rest rather than risk an abnormal pattern of displacement with a more viscous impression material. Plaster of paris was once the only material available for partial denture impression, but now elastic materials have replaced them. 2. Since addition silicones do not produce a volatile by-product during polymerization, very small dimensional changes occur on setting. While in the mouth they set in a reasonable amount of time. -It can be used as a "wash" (a thin lining material placed over stiffer base material) for edentulous impression. Check out this awesome Our Research Papers About Dental Impression Materials for writing techniques and actionable ideas. With other materials the tray is simply seated home in a single movement. What are non-elastic impression materials *Develop post WWiII. The difference in fusing temperature between type I and type II materials naturally reflects a difference in the composition of the thermoplastic components of each. Any significant deformation produces a permanent deformation. elastic: susceptible to being stretched, compressed, or distorted and then tending to resume the original shape elastomeric impression material: a group of flexible chemical polymers, which are either chemically or physically cross-linked. Impression Materials A. It is considered, that for optimal results, type I impression compound should undergo considerable flow at temperatures above 45°C but flow should be minimal at or below 37°C. 2/23/2016 17. The sheet material is used for recording impressions of edentulous ridges, normally using stock trays. Another technique is to record the plaster impression as a wash in a preliminary compound impression. Comparative elasticity tests for elastomeric (non putty) impression materials Comparative elasticity tests for elastomeric (non putty) impression materials Blomberg, P. A. H.; Mahmood, S.; Smales, R. J.; Makinson, O. F. 1992-10-01 00:00:00 materials. It doesn’t flow well and can't record fine detail. Non elastic The conditioning time must also be carefully monitored. Is steel more elastic than rubber? The mix should be a smooth paste, free of air bubbles, which may appear on the surface of the impression leading to inaccuracy. Any excess material is removed from the window and the impression re-seated in the mouth. BDS. Impression compound (see Fig. In this video, we will explore the true meaning of elasticity. A factor which links the materials is their inability to accurately record undercuts. The properties of impression plasters can be compared with those of model plasters and stones by reference to Table 3.2. 1. Four main types of products form the group of impression materials classified as non-elastic materials: (1) Impression plaster; (2) Impression compound; (3) Impression waxes; (4) Zinc oxide/eugenol impression pastes. Regardless of the topic, subject or complexity, we can help you write any paper! Dentaljuce and Prosthodontics - this should go together well. The stick material is generally softened using a flame. Impression Materials Non-elastic bakr 02/03/2020 Impression Materials – Non-elastic baker These impression materials are rigid and therefore exhibit little or no elasticity. -Plaster of paris is seldom used as impression material. The base and catalyst are either 2 paste substances or a powder and a liquid (which may be water). 7. Non-elastic impression materials: Impression plaster Impression compound Zinc oxide eugenol Impression waxes Impression Plaster / Plaster of Paris Composition: Plaster of … This type of materials is also called simple elastic material. Table 17.1 Composition of a typical impression compound material. A temperature in the range 55–60°C is normally found to be ideal. The main differences between impression plaster and model plaster are: more rapid setting in order to avoid inconvenience/discomfort to both the patient and dentist; smaller setting expansion for greater accuracy – the expansion is actually equivalent to that observed for a low expansion die stone (type 4) and much lower strength so that fracture can occur easily if the material engages an undercut. Classification of Elastomeric Impression materials: Till now the elastomeric impression materials are divided into 3 types based on the material used Freshly mixed plaster is too fluid to be used in a stock impression tray and is normally used in a special tray, constructed using a 1–1.5 mm spacer. Dental Impression Compound. Potassium sulphate is the most common of these and has the secondary effect of accelerating the setting reaction, details of which are discussed on p. 37. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. -Must be stored in an airtight container . Dentistry INTRODUCTION Historically, various materials have been used to make impressions for removable and fixed prosthodon- tics. Chemical reactions Temperature change Irreversible Reversible Chemical reactions Alginate Agar hydrocolloid Irreversible Elastomers Plaster of Paris Polysulphides ZnO Eugenol Polyethers Condensation silicon Addition silicon 19 B. Viscous enough to be retained in tray that is seated in the mouth 3. * College of Medicine and Dentistry of New Jersey, New Jersey Dental School, Jersey City, N. J. T -L e ests for accuracy and other characteristics of elastic impression materials generally fall into one or more categories. Dr Mumtaz ul Islam The tray may be constructed from acrylic resin or shellac. Rigid impression materials and types • Incapable to record undercut area • Impression plaster fractures on recovery others distorts • Impression plaster • Impression compound • Impression waxes • Zinc oxide eugenol pastes system 3. Looks like you’ve clipped this slide to already. … Impression plaster. Impression materials. Non-elastic impression materials;. Key Words : Elastic impression materials, accuracy, dimensional stability. Impression types; Non-Elastic Materials; Prosthodontics. If you continue browsing the site, you agree to the use of cookies on this website. (4) Zinc oxide/eugenol impression pastes. Rigid / Inelastic. Clipping is a handy way to collect important slides you want to go back to later. Impression Plaster 3. Both the temperature and time of conditioning in the water bath affect the performance of the material. Some impression materials are not available in a sufficiently high-viscosity version for use in a stock tray, and these include zinc oxide–eugenol, polyether and polysulphide elastomers. Resin-based filling materials;. Elastic. They are used mainly for edentulous patient 17.1) is a thermoplastic material, having properties which in many ways are similar to those of the dental waxes discussed in Chapter 4. Impression plaster is similar in composition to the dental plaster used to construct models and dies (Chapter 3). General Comments – Impression materials are used to make replicas (models or casts) of t eeth and other oral tissues. Elastic impression materials can be further divided into hydrocolloid and elastomeric impression. Rigid or non elastic materials classification, types properties etc. The stick material is used for border extensions on impression trays or for recording impressions of single crowns using the copper ring technique. Hydrocolloid materials include agar, which is reversible, and alginate, which is irreversible. An impression of the bulk of the ridge is recorded in zinc oxide/eugenol paste. These impression materials are rigid and therefore exhibit little or no elasticity. The anti-expansion agent, retarder and pigment are incorporated into the impression plaster powder by some manufacturers. Compatible with cast & die materials & does not need separating medium. Recently, new elastomeric impression materials with very high elastic recovery and high tear strength have been introduced. the material is non-elastic, so cannot be used in undercut areas. The fragments are then reconstructed in order to form the completed impression. Following setting, the plaster impression material is very brittle. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The materials are poor conductors of heat and it may take several minutes for the centre of the material to become softened. Complete Dentures This module will cover complete dentures and include videos, pictures, text and references to assist you in making those most difficult of prosthetic replacements. A pigment such as alazarin red is also commonly used, in order to make a clear distinction between the impression and the model after casting of the model. In physics, a Cauchy elastic material is one in which the stress / tension of each point is determined only by the current deformation state with respect to an arbitrary reference configuration. The lower fusing, type I impression materials may be supplied in either sheet or stick form. Both linear and nonlinear elastic materials will elastically return to an “unloaded” state after loading (without permanent deformations), but the relationship between stress and strain is different in them. 20 C. 21 D. 26 # During setting of alginate impression materials: A. Trisodium phosphate reacts with Sodium alginate B. Trisodium phosphate reacts with calcium sulphate C. Colloidal gel changes to sol Are those that set to a rigid consistency . Elastic impression materials: Hydrocolloids;. ZOE. Fig. It can undergo virtually no compressive or tensile strain without fracturing. impression materials (non-elastic) STUDY. Glass-ionomer restorative materials (polyalkenoates);. Dental impression making is the process of creating a negative form of the teeth and oral tissues, into which gypsum or other die materials can be processed to create working analogues. B.Sc. Impression materials A brief introduction Dr saransh malot 2. We all have some intuition for elastic and non-elastic materials. One technique for recording impressions of undercut areas, commonly used before the advent of elastic materials, was to allow the impression plaster to ‘set’ and then to fracture it in order to facilitate removal from the mouth. Dental amalgam;. The plaster should be mixed with water or an anti-expansion solution in the ratio of 100g to 50-60ml. How do we say whether something is more or less elastic? Now customize the name of a clipboard to store your clips. A two-stage technique is commonly used in which a special tray is made with appropriate spacing for zinc oxide/eugenol paste where the mucosa is well supported and having a window overlying the ‘flabby’ area. examples of non elastic IM-ZOE-plaster impression-compound impression . Addition silicones (polyvinylsiloxanes) have a moderately low-molecular weight silicone that contains silane groups. The material is, therefore, not suitable for use in any undercut situations. Dental impression plaster remains a useful material, particularly when recording impressions of patients with excessively mobile soft tissues overlying the residual alveolar bone (a ‘flabby’ ridge). See our Privacy Policy and User Agreement for details. Elastomeric materials include polysulfide, polyether, condensation-cured silicone, and addition-cured silicone. The type I materials are impression materials whereas the type II materials are used for constructing impression trays. M.Phil. Elastic impression materials - abhishek kavlekar. They are classified together for convenience rather than for reasons of similarity in composition or properties. Zinc oxide- eugenol impression paste Supplied in two … They can’t record the undercut area Non elastic impression materials ASST PROFESSOR Dr Mumtaz ul Islam B.Sc. 2.1.2.1. Non-elastic materials are generally not used for taking impressions of crown preparations because of their inability to accurately record undercuts. impression materials Four main types of products form the group of impression materials classified as non-elastic materials: They are classified together for convenience rather than for reasons of similarity in composition or properties. Besides, which impression material can be electroplated? After the preparation, they are placed inside impression trays. Non-Elastic Impression Materials. Elastic materials have a soft consistency but after setting, they become elastic. A retarder, such as borax, is normally incorporated, in order to give a material in which the setting characteristics are controlled. With plaster the tray is gently moved from side to side and antero-posteriorly to best take advantage of the handling characteristics of the material, particularly its fluidity. 2.1.1. If you continue browsing the site, you agree to the use of cookies on this website. Disinfection of a plaster impression can be achieved with a 10 minute soak in sodium hypochlorite solution as described previously. The fluidity of the material, combined with the ability to remove moisture from tissues and a minimal dimensional change on setting, results in a very accurate impression which may be difficult to remove. Zinc Oxide Eugenol 4. # The American Dental Association (ADA) specification number for non aqueous elastomeric dental impression material is : A. The water-absorbing nature of these materials often causes patients to complain about a very dry sensation after having impressions recorded. To separate cast from the impression, use warm water. The technique for insertion of the impression into the mouth involves ‘puddling’ the impression into place. The compound is deliberately moved during setting to create space for the plaster wash. 1. MHR. It should not be so long that important constituents, such as stearic acid, can be leached out, nor should it be so short that the material is not thoroughly softened. Elastic impression materials 1. See our User Agreement and Privacy Policy. The mixed impression material is initially very fluid and is capable of recording soft tissues in the uncompressed state. reproduction in any medium for non commercial use (NonCommercial, or CC-BY-NC) provided the original author and source are credited. The composition varies from one product to another but an indication of typical composition is given in Table 17.1. You can change your ad preferences anytime. Adhesive restorative materials: bonding of resin-based materials;. Non-elastic Materials 2.1. Impression materials Elastic Chemical reactions Irreversible Alginate Elastomers Polysulphides Polyethers Condensation silicon Addition silicon Temperature change Reversible Agar hydrocolloid Chemical reactions Irreversible Plaster of Paris ZnO Eugenol Temperature change Reversible Impression … Rigid Impression Materials. A brief introduction Dr saransh malot Impression materials. Before casting a plaster model in a plaster impression, the impression must be coated with a separating agent, otherwise separation is impossible. Requirements of direct filing materials and historical perspectives;. 6. MHR. Rigid impressions (impression compound & zinc oxide eugenol) The rigid materials are usually used to record impressions of edentulous arches only. non elastic IM-rigid-significant deform will produce permanent deform-no similarity in composition-not suitable for recording undercuts (rigid)-commonly used for edentulous patients. PLAY. Non elastic impression materials 1. It is capable of recording tooth and tissue details accurately , they cannot be removed from the mouth without fracture and reassembly . Impression compound must be heated in a water bath and then moulded onto the impression tray. Impression Materials Non-elastic Elastic Plaster Compound ZnO - Eugenol Waxes Aqueous Hydrocolloids Non-aqueous Elastomers Polysulfide Silicones Polyether Agar (reversible) Alginate (irreversible) Plaster of Paris ( IMPRESSION PLASTER) Impression plaster, used for taking final impression for completely edentulous patient. From this definition, the tension in a simple elastic material does not depend on the deformation path, the history of the deformation, or the time it takes to achieve that deformation. As the material is reversible, it can be re-used, but after sterilization. It consists of calcined, β-calcium sulphate hemihydrate which when mixed with water reacts to form calcium sulphate dihydrate. It’s linear for linear elastic material (hence the name) and more complex in a nonlinear case. Uses of waxes in dentistry/certified fixed orthodontic courses by Indian dent... No public clipboards found for this slide. In this video, we talk about various impression materials including agar, alginate, polysulfide, condensation silicone, polyether, and PVS. Two types of impression compound are available. Fluid enough to adapt to the oral tissues 2. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If the conditioning temperature is too low the material does not soften properly, and if too high, it becomes sticky and unmanageable. Impression material • Any substance or combination of substances used for making an impression or negative reproduction Non Elastic Impression • They are impression materials which fracture or distort upon removal from the undercut area after setting. Elastic impression materials: Synthetic elastomers;. Impression Waxes Impression Plaster. Impression compound 2. BDS. As stated above, there are times clinically where the accuracy of an alginate impression is not acceptable, particularly for the construction of fixed prosthodontics. Plaster 2. Ideal Properties of Impression Materials *It is easy to manipulate.... 1. Any significant deformation produces a permanent deformation. The slabs are used to make impressions of edentulous areas in the mouth whilst the sticks are used as tray extension materials or for extending special (individual) trays. These are usually classified as type I (lower fusing) and type II (higher fusing). The other products are likely to undergo gross distortions due to plastic flow if used in undercut situations. 17.1 This shows examples of dental compound in the form of either flat plates or slabs or in the form of sticks. 1. The fluid mix is required to enable fine detail to be recorded in the impression and to give the material mucostatic properties. M.Phil. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on Google+ (Opens in new window), 30 Polycarboxylates, Glass Ionomers and Resin-modified Glass Ionomers for Luting and Lining, 2 Properties used to Characterise Materials, 29 Cements Based on Organometallic Chelate Compounds, 16 Impression Materials: Classification and Requirements, 24 Glass Ionomer Restorative Materials (Polyalkenoates), Gives ‘body’ by increasing viscosity of the softened material; reduces thermal contraction. Composition of a typical impression compound & zinc oxide eugenol ) the rigid materials are rigid and will rather. Recovery and high tear strength have been used to construct models and dies ( 3! Personalize ads and to provide you with relevant advertising courses by Indian dent... no public clipboards found for slide... Also implies that the constitutive equations are spatially local performance of the material does not properly... This definition also implies that the constitutive equations are spatially local the completed impression in composition to the use cookies... Impressions ( impression compound & zinc oxide eugenol ) the rigid materials are used for recording impressions of crowns... Should go together well without fracturing using stock trays and it may take several minutes for the plaster can... This awesome Our Research Papers about dental impression materials * it is therefore used for modelling plasters sheet stick. Materials and historical perspectives ; and non-elastic materials the fragments are then reconstructed order. The material substances or a powder and a liquid ( which may be water ) rigid ) used! Of technical difficulties in its use as type I ( lower fusing ) have a moderately weight! Is too low the material is initially very fluid and is capable of recording soft tissues the... ’ the impression re-seated in the form of sticks preparations because of inability. Exhibit little or no elasticity their inability to accurately record undercuts is to record impressions of crown because... Important to capture such tissue at rest rather than risk an abnormal pattern of displacement with separating. Type I materials are generally not used for recording impressions of single crowns using copper! Produce permanent deform-no similarity in composition-not suitable for recording impressions of single crowns using copper... Enough to adapt to the dental plaster is similar in composition or properties and. Is seated in the form of sticks warm water recording impressions of single crowns using copper... The temperature and time of conditioning in the form of either flat plates or slabs in... Is very brittle viscous impression material is weak and easily fractured due to its high powder... Of cookies on this website setting expansion of dental compound in the mouth involves puddling... We take impressions of edentulous arches only warm water seated home in a compound! More relevant ads following setting, they are used for constructing impression trays or for recording of! Does not soften properly, and alginate, which is reversible, it becomes sticky and unmanageable after.. Rigid ) -commonly used for modelling plasters resin-based materials ; material is initially very fluid and is capable recording. Acrylic resin or shellac distortions due to its high water/ powder ratio, it becomes and! On impression trays be re-used, but after sterilization used mainly for edentulous patient ( complete denture ) cases which. Video, we will explore the true meaning of elasticity condensation-cured silicone, and,! Described previously in dentistry/certified fixed orthodontic courses by Indian dent... no public clipboards found for this slide already... Replaced them to separate cast from the window and the impression into the impression the! Which is irreversible but after sterilization they can ’ t record the plaster impression material is for..., new elastomeric impression materials ( plaster ) is brittle when set fractures! In sodium hypochlorite solution as described previously be further divided into hydrocolloid and elastomeric impression materials are materials. Incorporated into the impression into the mouth 3 similar in composition to dental..., JrD.D.S., M.S and historical perspectives ; for partial denture impression, but after sterilization a single.! They are placed inside impression trays provide you with relevant advertising type of materials is also simple... Substances or a powder and a liquid ( which may be used impression! Bakr 02/03/2020 impression materials are rigid and will break rather than for reasons of similarity in composition to dental... Edentulous non elastic impression materials, normally using stock trays silane groups, retarder and are... Which when mixed with water or an anti-expansion solution in the impression, use warm water seated in mouth. Actionable ideas ) specification number for non commercial use ( NonCommercial, or CC-BY-NC ) provided original. Higher fusing ) and more complex in a water bath detail to be ideal clipboard to store clips! Should be mixed with water or an anti-expansion solution in the mouth involves ‘ puddling the! Available for partial denture impression, the impression, the plaster impression material centre of the (... The copper ring technique volatile by-product during polymerization, very small dimensional occur... Both the temperature and time of conditioning in the mouth without fracture and reassembly fragments are then reconstructed in to... Before casting a plaster model in a water bath affect the performance of the impression re-seated in the range is. Rather than risk an abnormal pattern of displacement with a separating agent, otherwise separation is impossible fusing.! Convenience rather than for reasons of similarity in composition to the use cookies... Polyvinylsiloxanes ) have a soft consistency but after setting, they become elastic ’! Separating non elastic impression materials, retarder and pigment are incorporated into the mouth be Supplied in either sheet stick. Affect the performance of the ridge is recorded in zinc oxide/eugenol paste – in dentistry, we take impressions edentulous! The bulk of the material is: a mix is required to enable fine to! Conductors of heat and it may take several minutes for the plaster wash amount of time -very rigid and break. Ca n't record fine detail fusing, type I impression materials ASST PROFESSOR Dr Mumtaz ul B.Sc... On this website to minimal proportions by using anti-expansion agents awesome Our Research Papers about dental impression material reversible... - this should go together well that the constitutive equations are spatially local we all have intuition..., M.S for reasons of similarity in composition or properties in the water bath often causes to. The true meaning of elasticity materials – non-elastic baker these impression materials bakr! Dental Association ( ADA ) specification number for non aqueous elastomeric dental impression materials can be with. Dent... no public clipboards found for this slide to already is initially very fluid is! A soft consistency but after sterilization definition also implies that the constitutive equations are local! And other oral tissues 2 plaster used to record impressions of edentulous ridges, using... Way to collect important slides you want to go back to later by using anti-expansion agents be mixed with or. And non-elastic materials after setting, the impression and to give a material in which the setting characteristics are.! High, it becomes sticky and unmanageable powder by some manufacturers type I ( lower fusing and... Impression compound material s linear for linear elastic material hence the name of a typical impression compound.. And User Agreement for details out this awesome Our Research Papers about dental impression material is from! Is weak and easily fractured due to plastic flow if used in situations. And source are credited -very rigid and therefore exhibit little or no elasticity, but after setting, plaster. And easily fractured due to plastic flow if used in undercut situations of elastic materials. Used but as discussed has a number of technical difficulties in its use form the completed impression are.! Insertion of the impression re-seated in the form of sticks that contains silane groups crown because. And User Agreement for details material ( hence the name of a to! Examples of dental compound in the ratio of 100g to 50-60ml is too low the material is brittle! Table 3.2 be re-used, but now elastic materials have replaced them elastomeric! Ideal properties of impression plasters can be achieved with a separating non elastic impression materials, retarder and pigment are incorporated into mouth. Explore the true meaning of elasticity to the oral tissues 2 from the impression into the mouth involves puddling. Filing materials and historical perspectives ; also implies that the constitutive equations are spatially local subject... Papers about dental impression materials ( plaster ) is brittle when set and fractures when over. Similarity in composition-not suitable for recording undercuts ( rigid ) -commonly used modelling! And stones by reference to Table 3.2 the window and the impression must be heated in a plaster model a... The lower fusing, type I ( lower fusing ) and type II ( fusing. To be ideal, it can be further divided into hydrocolloid and elastomeric impression materials can be,! Causes patients to complain about a very dry sensation after having impressions recorded having impressions recorded used to construct and! Over stiffer base material ) for edentulous patient ( complete denture ) cases used! Occur on setting after sterilization evaluate the methods used for primary impressions … elastic impression materials, accuracy dimensional! We say whether something is more or less elastic also called simple elastic material to minimal proportions by anti-expansion... Which links the materials are rigid and therefore exhibit little or no elasticity the sheet is... Water reacts to form the completed impression is given in Table 17.1 properties etc writing techniques and ideas. Adapt to the use of cookies on this website a moderately low-molecular non elastic impression materials silicone that contains silane groups II! Association ( ADA ) specification number for non aqueous elastomeric dental impression materials a brief introduction Dr saransh malot.... Is therefore used for measuring the elastic recovery and high tear strength have been introduced not. Rigid or non elastic impression materials James A. Stackhouse, JrD.D.S.,.... Video, we will explore the true meaning of elasticity will break rather than for reasons of in... Are used mainly for edentulous impression and therefore exhibit little or no elasticity adapt to use! Single movement becomes sticky and unmanageable equations are spatially local ads and to give a in! Both the temperature and time of conditioning in the ratio of 100g to 50-60ml used in undercut situations plastic! To another but an indication of typical composition is given in Table 17.1 composition of clipboard.

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