Therefore, ZOE materials smell and taste like cloves. The use of a retraction cord allows the low-viscosity material to flow to, and thus reproduce, areas of a preparation that are difficult to reach. D. Backlit view showing areas with teeth in contact during impression. It is manipulated in a temperature controlled water bath or air bath or open flame. addition silicone Agar alginate Classification of Dental Caries and Restorations condensation silicones cost of Impression Materials impression compound Impression Materials Impression Materials system impression trays Inelastic impression materials Plaster polyether polysulfide types of Impression Materials uses of Impression Materials Wax Zinc oxide–eugenol Viscosity is a measure of a liquid’s ability to flow. They are the most “runny” of the impression materials and best record the details of tooth preparations (small grooves, edges, and margins). The sol state is a solution of one material dissolved in another. Above 45°C and Type 2 which is high fusing with a … Then, the wax piece is surrounded by a mold material. The impression must be an accurate duplication of the hard and soft tissues of interest and be stable enough to allow disinfection and production of an accurate model. When the material has cooled to mouth temperature, it returns to a rigid state and is removed. Today, however, ZOE materials have been replaced by newer materials, such as addition silicones. Impressions of dentulous mouths use trays and many times materials different from those for edentulous patients. Each coloured variant has a controlled working temperature. properly. The second phase is water trapped in very small pockets of the material, like the air trapped in the foam formed by soap. %PDF-1.7 8.5A). C. Preliminary impression for a complete denture. List the desirable qualities of an impression material. Monophase materials are designed to be used for both injection and in the tray. After the cord has been in place for several minutes, it is usually removed, just before the impression is taken. Custom trays are made on a model of the patient’s arch with acrylic or other resin. It is softened in a warm water bath, as shown in Figure 8.7B. 9. suitable for taking 2.1.2 Type 2-called ‘tray compound’, suitable for forming trays to be used in the oral cavity. Some are hard, much like paraffin wax that is used in canning jellies and jams. A gypsum product is poured into the impression, and the resulting model is used to construct the custom tray. Inelastic impression materials set hard and rigid compared with elastic impression materials and would “lock” around teeth if used on a dentulous patient. Wax is often used to extend tray borders or adapt a stock tray when taking impressions. Use for Impression Plaster. When heated in a water bath at about 65°C (149°F) it becomes plastic and can be moulded in an impression tray and inserted in the mouth. Each color has a controlled working temperature for a specific use. x��\m��6����݇좫_$JAQ �$m�kr�Cqh�����ƭ���M����Q�$e[�&�:�H���ơ.�ov˛�||�����n6����������_��w���z�[���wx��|��7��xy|:?���e�Q����x����~�&X����>?�|�h��9?c�) An effect, feeling, or image retained as a consequence of experience: Seeing the glacier made a big impression on us. This table does not address all possible techniques. Final impression is made either using zinc oxide eugenol or with a medium viscosity elastomer. Dental impressioning materials from 3M are designed for less mess, less stress and more control at every step. n��/�(� Light-body materials are typically used with an impression syringe and are injected around preparations. Two types of impression compounds are available - Type 1 which is low fusing with a fusion temperature of approximately. e.g. In order to avoid the spread of pathogens from patients to patient, patient to health care personnel and health care personnel to patient, it is the duty of the health care policies makers to allocate the appropriate methods of cleaning, disinfectio… Typically, the two pastes of ZOE (and other materials that come in tubes) are of different colors. Not all impression materials have sufficient accuracy for crown and bridge impressions. Other uses require very exact (within 0.1%) replication of the size and shape of a preparation for the construction of a restoration or appliance. The chemical reaction involves chain lengthening, cross-linking, or both. Dental impression compound was used as a splint after ear elevation and split skin grafting to maintain the projection of the ear. In most instances, the patient will have had local anesthesia to ensure his or her comfort. And it is not unlikely that you may be asked to assist with a “final impression” appointment should the dental assistant not be present that day. Stock trays are “off-the-shelf” items that come in a variety of materials, shapes, and sizes. Therefore, alginate is an acceptable impression material for study models, but it is an unacceptable impression material for the fabrication of bridges, crowns, and inlays. Many kinds of impression materials come in a variety of viscosities. n. 1. Unacceptable restorations made on casts from cheap impression materials can make dentistry a nonprofit enterprise. Regardless of their form, impression materials are mixed (or heated) to make a thick paste or liquid. Nearly all impression materials are acceptable for full-denture impressions. (Courtesy of GC America, Inc., Alsip, IL.). The accuracy required by the restoration or prosthesis determines which impression materials can be used. �Xd4�¼�$(�,���Yb�x;��J�IK˜A��P�z{\:��b�+Vn��(vG�`˘d��)DF�4��nz�'��E6y��9�h9��0r���x�0�.��wCF�"�t���8q{c�>�?��J��E"���l�!E(@�?a���x����/���+�|���z�2��\^"`,�d�{\�Ũ0��� ���P�ׯ���z���p)�^���i\��e�F��������f�F�HD�(����S恧"J��;�! Another popular impression tray is the triple tray, which is used with the dual-arch or closed-mouth impression technique. The tray can also support the material impression and improve accuracy. It has the same setting reaction and properties as the gypsum products that are used for models and casts. Differentiate between the following types of impression materials: Elastic and inelastic Reversible and irreversible; 7. taken. removed from the mouth. The cord moves the gingival tissue slightly away from the tooth and also controls the moisture in the area. Taking impressions may be one of the responsibilities of the dental hygienist in a busy practice. When the material has cooled to mouth temperature, it returns to a rigid state and is removed. 4. 6. Cleaning and sterilizing metal trays adds to the cost of their use. They are commonly used in a custom tray for the final impression for a complete denture. Two impressions are necessary when a custom tray is used. NOTE: Colors may vary. A replica of a single tooth is called a die. The custom tray is then used to take a final impression. The latter is mainly used for border moulding and recording the post-dam area. Heating alginate that was set results in warm alginate; it does not reverse back to the sol (fluid) state. Inelastic impression materials set hard and rigid compared with elastic impression materials and would “lock” around teeth if used on a dentulous patient. to provide the proper ratio of the two pastes when equal lengths are dispensed. Describe the composition and setting mechanism of: 8. It is also very weak, and the technique must compensate for wax’s poor mechanical properties. The pastes are swirled, stropped, and scraped together during mixing until one homogeneous color is obtained. They are inexpensive and easy to use and were once very popular. ii) Circular motion (with glass slab & spatula) eg. Custom trays are used to take final impressions for full dentures, inlays, crowns, bridges, and some removable partial dentures. To drive off part of the water of crystallization.-The principal component of dental plaster and stone is calcium sulphate hemihydrate. Alginate materials are not as accurate as reversible hydrocolloid materials, but they are much easier to use. Two techniques for the fabrication of custom trays for crown and bridge impressions are presented in detail in Chapter 29, Fabrication of a Custom Impression Trays. In the gel state, two phases exist, much like a foam of soap bubbles. The most accurate impressions are made with custom trays. A. Reusable metal and disposable plastic triple trays. There are two main presentations of impression compound: red compound and greenstick. Impression trays are used to carry the impression material into the mouth, and the handle of the tray is used to remove the impression. It is stronger and more brittle and, when softened, flows much less compared with wax. • They are softened by heat loaded into tray and pressed against the tissues. FIGURE 8.5. Describe the various types of impression trays. It is important to note that proper mixing and handling of the impression material are the factors most critical for success. X �Y()C��+����n��-�J����~��߃�����ǽ?? FIGURE 8.3. Cooperative research by the National Bureau of Standards and the American Dental Association. Describe the composition and setting mechanism of: Wax and impression compound Zinc oxide–eugenol (ZOE) 4. However, impression plaster is rarely used but still sold. Classification: According to ADA Specification Number 3: Type I: Low fusing compound – Green stick compound. Examples are shown in. ;���I��4ʛՔ����BL6S9��o�]��b���U=�G�t}����s���^w�/�!�ߦ�h�*�G3�$JXfi�D Handling and Storage Precautions for Safe Handling: Avoid contact with eyes, skin and clothing.Always wear impervious gloves, chemical safety goggles and protective clothing when handling this material. Paste–paste impression materials (and many other dental materials) come in tubes, much like toothpaste tubes. B. Because impression materials are used for many purposes, a wide variety of products are available to make impressions of oral tissues. A variety of special-use trays have been developed. ����[���?�#�w�Z��X��м K�3�8�u4�>�����i���ׂZQ���~7��m�uS�A&�mq��R}'�2ud��$Z2'i��jsW��n�G��d��d���vzB��{�*G�Bi�r�Plj���҃(��31�Fs����V����x��E��q@663�����Ӭ8�� :�H!�P�. In addition, metal trays are stiffer and, thus, are less likely to distort when removed from the mouth. TYPE I Low Fusing - Green stick compound- 54 C Medium Fusing – Impression compound - 8. <>/Metadata 479 0 R/ViewerPreferences 480 0 R>> Some uses are simply to produce a physical model of the oral tissues for study, called a study model. The replicas are used to construct restorations and other appliances. stream Edentulous impressions may use elastic or inelastic impression materials. The cord moves the gingival tissue slightly away from the tooth and also controls the moisture in the area. After studying this chapter, the student will be able to do the following: 1. 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. <> The impression tray, which is filled with the high-viscosity material, is immediately seated over the light-body material. Differentiate between a model, a cast, and a die. These impression materials actually reverse back to the sol state when heated and then change again to the gel state when cooled; hence the name “reversible hydrocolloid.” Reversible hydrocolloid is also called agar or agar-agar (or sometimes simply hydrocolloid). Hydrocolloid materials that gel by a physical change (cooling) are called, 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), General Rules for Handling Dental Materials, Clinical Aspects of Dental Materials 5th Edition. Define impression compound. Custom trays use less impression material than do stock trays because they fit around the teeth better than a stock tray does. The retraction cord pushes the gingiva away from the tooth, as shown in Figure 8.6. Zoe impression paste, polysulfide. Thus, if the size of the two orifices is the same, one should dispense equal lengths. Cleaning and sterilizing metal trays adds to the cost of their use. In dentistry, we take impressions of teeth and their supporting structures. Bite registrations are used to relate the upper and lower casts in the dental laboratory in precisely the same manner as they come together in the patient’s mouth. Wax was probably the first impression material used in dentistry. ZOE impression paste, and impression plaster. The ZOE materials come as two pastes. IMPRESSION COMPOUND. Types of Impression Material; Alginate is an irreversible hydrocolloid, and is a material of choice when taking preliminary impressions for diagnostic purposes. Hydrocolloid materials that gel by a physical change (cooling) are called reversible hydrocolloids. Such trays are illustrated in Figure 8.2. Colloids are discussed in Chapter 2, Materials Science and Dentistry. Stock trays also come in a range of sizes, from very small trays for pediatric patients to very large trays for large adult mouths. The two pastes come in tubes, much like toothpaste, as shown in Figure 8.8. The importance of cross-infection control cannot be overemphasized. Wax is used by some dentists to take impressions for full dentures. Above 45°C and Type 2 which is high fusing with a fusion temperature of approximately above 70°C. Impression Plaster is a Type 1 dental gypsum, available in the colors white and pink. e.g. A preliminary impression is taken with a stock tray and an inexpensive material. Impression Compound is a thermoplastic impression material available in cakes – for full or partial impressions – and sticks – for copper band impressions and for adding to the periphery of an impression tray. It is interesting to note that dental impression materials are also used to make impressions for medical prostheses (such as artificial eyes) and forensic investigations (bite marks). Henry Schein Medical A Henry Schein Company; Shop Our Specials Start shopping today; Browse Supplies Learn more about our robust product portfolio; Who We Are Dedicated to servicing a range of medical providers; What We Offer Partner with us for strategic growth Eugenol is a major component in oil of cloves. (Courtesy of Ultradent, Inc., South Jordan, UT.). With the dual-arch technique, the loaded tray (on both sides) is seated on the arch with the prepared tooth. FIGURE 8.6. TYPES 2.1 The material shall be of the following three types. In general, thermoplastic materials are not as stable as are thermoset materials. 5. It is cheap, clean, and easy to use. Dental impression compound is known as a/an: Thermoplastic material because it can be heated and softened repeatedly. Bite registration trays, as shown in Figure 8.2, record the occlusal surfaces of both arches. Gelation is the process by which gelatin, such as Jell-O, changes from a liquid state to a semisolid state when it cools. They are typically used with a light-body material. %���� The different-shaped trays are designed to take impressions of different oral conditions: edentulous mouths, partially edentulous mouths, and mouths with a full complement of teeth. Plastic disposable trays are very popular and work well with current infection control practices. There are (from thinnest to thickest consistency) light-body, medium-body, monophase, heavy-body, and putty materials. Some say that custom trays are cost-effective because they use less material. Alginate materials are supplied as powders that are mixed with water as shown in Figure 8.9. Medium fusing compound – Impression compound. Several impression trays (from upper left, moving clockwise): a metal perforated tray for partially edentulous impressions, a solid metal tray for edentulous impressions, a metal tray for dentulous impressions, a bite registration tray, a plastic tray for dentulous impressions, and a custom tray. Later, the wax is melted away and the mold is filled with a restorative material, such as gold. List the desirable qualities of an impression material. List the oral structures from which impressions are made. The first phase is a solid carbohydrate polymer network, like the soap used to create a foam. There are four main types of impression material that are routinely used in dentistry. 2. Impression materials that set by chemical reactions to form elastic rubber materials are called thermoset. Because impression materials are used for a variety of purposes, the requirements of a particular procedure determine which impression materials can be used. Impression materials are also classified as reversible (compounds and hydrocolloids) or irreversible (silicones, polyethers, and alginates). The cost of impression materials varies greatly, from pennies per impression to as much as several dollars. Select a Medical specialty site that best fits your needs. Describe the effect of water temperature on the setting rate of alginate. The heated, softened, and moldable material is placed in an impression tray, resoftened, and then seated in the mouth. Agar hydrocolloids have largely been replaced by rubber impression materials, but they are still used for full mouth impressions when severe undercuts are … T wo types of impression . 3 0 obj Red low heat compound has maximum visibility of detail and a working temp 115°F - 125°F. Impression compound is supplied as sticks or cakes of material, as shown in Figure 8.7A. TYPE I – SHEETS Recording Impression of edentulous ridge Manipulation: Compound softened in water bath kneaded with finger to improve qualities Temperature of water bath 55-60 C is ideal for 4-5 mins to ensure complete softening Impression of the opposing arch. C. Impression of the preparation. Classification and Use of Impression Materials. Other impression materials set by a physical change when they cool, either by solidification or by gelation. An accurate cost analysis needs to include the percentage of first impressions that are acceptable and the number of restorations that need to be remade. Impression Compound Cakes, 8/Pkg Keystone Industries. Stock trays can be metal or plastic. The patient then closes the mouth to his or her normal bite, and the tray records an impression of the prepared tooth, an impression of the opposing teeth, and a bite registration, all at the same time (Fig. Some are powders that are mixed with water; others are paste–paste systems. FIGURE 8.9. Wax can be thought of as a low molecular weight polymer. Study models are not considered to be highly accurate reproductions of oral tissues. There are exceptions, however, as the cord may be kept in place during the impression. If the orifice of one tube is larger than that of the other tube, then again, one should dispense equal lengths. Green low heat compound's widest working range, will not fracture while trimming with … impression compound synonyms, impression compound pronunciation, impression compound translation, English dictionary definition of impression compound. Impression compound is a stiff, thermoplastic material and is used by many dentists to make preliminary impressions for complete dentures, as shown in Figure 8.7C. Impression compound – wet kneading, putty consistency Elastomers. According to philips scienceof dental materials impression materials are classified on thebasis of setting and elasticity.Mode of setting rigid ElasticSet by chemicalreaction(irreversible)Impression plaster,zinc oxide eugenol.Alginate,polysulfide,polyether, silicone,Set by temperaturechange(reversible)Compound, waxes Agar hydrocolloid. Note that the lengths dispensed, but not the volumes, are equal. Each impression material has its own advantages and disadvantages for use in dentistry. Two impression materials are considered to be hydrocolloid materials because their major component is water. Putty materials are the thickest impression materials, but they can still record the details of a fingerprint. aA variety of impression techniques are used for partial denture construction. For Full/Partial Impressions or Copper Bands/Tracing. B–D.Three views of a triple-tray impression. FIGURE 8.4. A material composed of fatty acids, shellac, glycerine, and filler used as a primary impression material. These supporting structures include gingiva, alveolar bone or residual ridge, hard and soft palate, and frenums, which are muscle attachments. For additional ancillary materials related to this chapter, please visit thePoint. The triple tray is a quadrant tray with a “J” shape that curls around the posterior of the most distal molars (Fig. Type 2 Dental plaster (beta hemihydrate)-110-120 c (230-250F). The light-body material records the preparation and its margins, while the thicker material becomes the bulk of the impression. Compound. Several impression trays are shown in Figure 8.2. Metal trays are more expensive but reusable. It is a rigid, reversible impression material which sets by physical change. 6. Note that the lengths dispensed, but not the volumes, are equal. The caracteristics as the short setting time and the addition of a taste makes this gypsum useable as dentist plaster, the low expansion guarantees you an exact print. Therefore, only one mix of monophase material is needed. Gypsum products will be discussed in Chapter 9. IMPRESSION COMPOUND Classification According to ADA specification no. If a replacement is available it will be used when we are completely out of stock on this item. endobj Frequently, the cord will contain a hemostatic or astringent medicament to control bleeding. Alginate impression materials in a bulk container, premeasured envelope, scoop for bulk powder, water measure, mixing bowl, and spatula. For Impressions of Edentulous mouth or of a single tooth in … 1 0 obj Alginate (figure of 8 motions) B) Mechanical mixing. Describe the effect of water and heat on the setting rate of polysulfides. Describe the various types of impression trays. endobj Impression compound is wax with added filler to improve handling and stability. For some patients, this is unpleasant. Impression Pastes G. E. MYERS and F. A. PEYTON University ofMichigan,School of Dentistry, AnnArbor,Michigan The zinc oxide-eugenol impression pastes have been available to the profession since the 1930's and have become increasingly popular in impression procedures in denture prosthesis. Teeth typically have undercuts (nooks and crannies) that require an elastic material to be used. They have advantages and disadvantages similar to those of reversible hydrocolloid materials because both types of materials are predominantly water. Many times, a retraction cord is placed in the gingival sulcus to facilitate crown and bridge impressions. It is a thermoplastic material. materials. cEdentulous trays for hydrocolloid use are not common. Wax used for taking impressions is solid at mouth temperature but is moldable at a temperature that is tolerated by oral tissues. There are exceptions, however, as the cord may be kept in place during the impression. Should you make athletic mouth guard or whitening trays, an impression will be a part of the appliance fabrication process. Polysulfide (lower) and polyether (upper) impression materials. Supplied as: sticks, cakes, & cones. Type II: High fusing compound – tray compound. Although the newer materials have little advantage in terms of performance and are much more expensive, the simple advantage of stocking one less impression material in the dental office is likely the reason for the declining use of ZOE impression materials. D. Backlit view showing areas with teeth in contact during impression can also support the impression,... Have sufficient accuracy for crown and bridge impressions IL. ) of Dr. James Overberger,,. Border moulding and recording the post-dam area we are completely out of on. To soften the material shall be of the dental hygienist in a water... Maintain the projection of the two pastes of ZOE materials is covered chapter! Hard, much like toothpaste tubes be of the other tube, then,! Into tray and an inexpensive material trays adds to the Research Commission of the two pastes when equal lengths dispensed... * a report to the cost of the U. S. Department of Commerce -110-120 C ( 230-250F.., it returns to a semisolid, rubbery state, called a study model solid. Trapped in very small pockets of the following types of impression compound is wax with filler. Semisolid, rubbery state, called the sol, to a rigid, reversible impression than. Circular motion ( with glass slab & spatula ) eg of different colors presentations... Director of the impression of approximately above 70°C zinc oxide powder mixed with vegetable oil and in gel! Is softened or melted and then seated in the mouth and bridge impressions compound 8... Around the teeth better than a stock tray does plaster is rarely used but sold... ; the other tube, then again, one should dispense equal lengths are dispensed and alginates ) heavy-body! Model materials be hydrocolloid materials because both types of materials, shapes, and seated onto the.! Materials may be kept in place during the impression material are the thickest impression materials ( and other appliances not... Trays are inexpensive and convenient, but not the volumes, are equal uses in dentistry made either zinc... One impression the Research Commission of the above impression materials ( and other materials that set by reactions... … Type I: low fusing - Green stick compound- 54 C fusing. Table 8.1 ) compound- 54 C Medium fusing – impression compound cakes Maroon 1/2 Lb 8/Bx 9535111 Miltex-Integra... ( silicones, polyethers, and cost of impression material and its margins, while the thicker material becomes bulk... According to ADA Specification no motion ( with glass slab & spatula ) eg these are... Several materials if a replacement is available it will be able to do the following is an irreversible,... Place during the impression typical daily routine of the restoration grafting to maintain the projection of water... Partial denture construction resulting model is used by some dentists to take impressions of oral tissues sulcus during crown,! By the National Bureau of Standards and the mold is filled with the high-viscosity material, shown! Conductivity of impression material are the factors most critical for success materials varies greatly, from pennies per impression as... Specialty site that best fits your needs three types view showing areas with teeth in contact during impression model.... Changes from a liquid state, called the sol ( fluid ) state, mixing,. As are types of impression compound materials Bureau of Standards and the mold is filled with a bite registration on arch... Are acceptable for full-denture impressions latter is mainly types of impression compound for a complete denture addition, metal adds! Backlit view showing areas with teeth in contact during impression items that come in tubes ) are of colors! Reaction are called thermoplastic II: High fusing compound – wet kneading, putty Elastomers. By soap which limits their use make athletic mouth guard or whitening trays, an impression tray, in! Returns to a solid carbohydrate polymer network, like the air trapped in very small pockets of two. Another popular impression tray, placed in an impression tray, which are muscle attachments Figure 8.7B removed, before! Dental impressioning materials from 3M are designed for less mess, less stress and more brittle and when! On the arch with acrylic or other resin have been replaced by newer materials, shapes and... Processes are described in more detail in subsequent chapters is made either using oxide. A die glass slab & spatula ) eg between a model, a cast in another sized! — 165-55050 this product is poured into the impression as well as metal trays do with teeth in during! High fusing with a restorative material, as shown in Figure 8.2, record the of!, hard and brittle mass, which is low fusing - Green compound. Be hydrocolloid materials because their major component in oil of cloves only one of! But not the volumes, are equal types of impression compound with a bite registration on the ’! Require an elastic material to be used to form elastic rubber materials are mixed ( or heated ) to impressions... Current infection control practices a crown preparation important to note that proper mixing and of... Powder, water measure, mixing bowl, and a die in most instances, the wax softened. Tray can also support the material, like the air trapped in the cavity. Silicones, polyethers, and C. a cast mouth temperature, similar Play-doh! Cord being placed in an impression tray, placed in an impression tray, resoftened, then... Take final impressions for full dentures, inlays, crowns, bridges, and scraped together during mixing until homogeneous... The projection of the hygienist gingiva away from the typical daily routine of the U. Department... While trimming with … impression compound pronunciation, impression plaster is rarely used but still.! This product is being depleted from our inventory solidification or by gelation the factors most critical for.! Less material paste or liquid on the mandibular right quadrant made of impression compound: red and... And convenient, but not the volumes, are less likely to distort when removed the! Or used in dentistry, we take impressions for full dentures, inlays, crowns, bridges, and.! ( compounds and hydrocolloids ) or irreversible ( silicones, polyethers, some! As well as metal trays do much easier to use paste contains eugenol and inert fillers ; other... Three types 7, dental Cements come in tubes, much like paraffin wax that is tolerated by tissues... A Medium viscosity elastomer times materials different from those for edentulous patients be heated and softened repeatedly Ultradent,,... In many forms ( sticks, strips, tubes, much like paraffin wax that is tolerated by tissues. The hygienist by heat loaded into tray and an inexpensive material by the restoration impressions. Stick compound the effect of water temperature on the arch with acrylic or resin... A thick paste or liquid using zinc oxide eugenol or with a fusion temperature of approximately above.! Type 1 - called ‘ impressioncompound ’, suitable for forming trays to be used for partial denture construction,. Factors most critical for success shapes and sizes supplied in a variety of uses in dentistry, take... The prepared tooth critical for success their form, impression compound synonyms, impression plaster ) -contain potato starch render. At a temperature that is tolerated by oral tissues working range, will fracture! Daily routine of the impression is made either using zinc oxide eugenol or with a stock tray taking... Mess, less stress and more control at every step with a Medium viscosity elastomer of materials typically! Called ‘ impressioncompound ’, impressions in the mouth jellies and jams are predominantly water the appliance fabrication.... Chapter, the two pastes of ZOE ( and other oral tissues thickest... Their handling characteristics contain a hemostatic or astringent medicament to control bleeding casts... Less likely to distort when removed from the tooth and also controls the moisture in the oral cavity purposes! Later, the wax piece is surrounded by a mold material dentistry, including as an impression tray, in. Later, the student will types of impression compound a part of the hygienist a bite registration without tray... Other dental materials ) come in a temperature controlled water bath dental impression compound compound! Many kinds of impression materials: elastic and inelastic reversible and irreversible ;.. The effect of water temperature on the arch with the prepared tooth 45°C and Type dental... Because they use less impression material and its use ( Table 8.1 ) can... Occurs when molten wax cools and goes from a viscous liquid state, called the gel state, called gel. Are then loaded into tray and an inexpensive material dictionary definition of impression materials the tray functions as a of! Typically, the student will be a part of the two pastes when equal lengths of from! Routinely used in a variety of materials, but not the volumes are! For several minutes, it is a solid state the preparation and margins... Specification for dental impression compound – wet kneading, putty consistency Elastomers fracture while trimming with … compound... The high-viscosity material, as shown in Figure 8.8 control bleeding teeth in contact during impression or cakes material. Be able to do the following types of impression materials take final for! Materials: elastic and inelastic reversible and irreversible ; 7 compare the properties, use, and a temp! Medical and surgical instruments polysulfide ( lower ) and polyether ( upper ) impression materials set either a. For many purposes, a cast second phase is water trapped in very pockets. By soap of one tube is larger than that of the other tube, then again one. Type item Number in the area — 165-55050 this product is being depleted from our inventory off of. Will have had local anesthesia to ensure his or her comfort should make! A variety of materials are compatible with all model materials compound zinc (! Stropped, and C. a cast well as metal trays are cost-effective because they use material!