Each material is used for different purposes, as some laboratories require a more detailed impression than others. Impression compound it is a non elastic type of thermoplastic impression materials. Impression materials, that is, the materials used to get an idea about the shape of teeth and the alveolar ridges, can be categorized as nonelastic and elastic materials. Elastic impression materials free download as powerpoint presentation. Elastic impression materials can be further divided into hydrocolloid and elastomeric impression.
The base and catalyst are either 2 paste substances or a powder and a liquid which may be water. These impression materials are rigid and therefore exhibit little or no elasticity. Dentaljuce and prosthodontics this should go together well. Non elastic materials are generally not used for taking impressions of crown preparations because of their inability to accurately record undercuts. 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. Submitted as partial fulfillment for a postdoctoral masters thesis, loyola university medical center, maywood, ill. Impression plaster used as mucostatic impression material for making final impressions for edentulous patients doesnt compress and displace tissues during seating of tray due to its fluidity 15. Impression materials usually used for edentulous patients.
This region is that part of the element over which significant inelastic behavior is expected to occur. Impression plaster used as mucostatic impression material for making final impressions for edentulous patients doesnt compress and displace tissues during seating of tray due to its. Impression materials nonelastic my dental technology. Impression materials used in the various phases of denture construction may be classified as being rigid, thermoplastic, or elastic substances. Condensation silicones more sensitive to prolonged storage addition silicones claim a shelf life of up to 2 years. Comparative elasticity tests for elastomeric non putty. 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. Such a material iselastic accordingtothedescription ofelasticity given earlier immediate response,fullrecovery, andit is also linear in its relation between stress and strain or equivalently, force and deformation. After the preparation, they are placed inside impression trays. Elastic and plastic properties of elastic dental impression materials.
What is classification of under elastic and non elastic. Elastic inelastic we now move from the cross section to the critical region. They are used mainly for edentulous patient complete denture cases. The material is, therefore, not suitable for use in any undercut situations. Complete dentures this module will cover complete dentures and include videos, pictures, text and references to assist you. The use of polymeric materials has become very popular since last thirty years in many applications. Chapter 2 material non linearit y in this c hapter an o v erview of material non linearit y with regard to solid mec hanics is presen ted. The ada recommends elastic recovery greater than 96. The term elastic as applied to impression materials is fairly unequivocal since the materials which form this group all possess the ability to be stretched or compressed and give a reasonable degree of elastic. Hydrocolloid materials include agar, which is reversible, and alginate, which is irreversible. It is only used to take primary impression of edentulous patient.
Comparison of elastomeric impression materials used in. Shop for bulk elastic spools for all your crafting needs below. Wholesale elastic by the spool including non roll elastic, poly braid elastic, cotton swimwear elastic and more. Elastic impression materials include reversible agaragar, irreversible alginate hydrocolloids and synthetic elastomers polysulfides, polyethers, silicones.
Vaseline is used as a separating agent on those areas requiring protection soft tissues, teeth etc. Nonelastic impression materials nonelastic impression materials impression plaster zincoxide eugenol impression paste impression compound 14 15. For the love of physics walter lewin may 16, 2011 duration. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Quantify the linear elastic stressstrain response in terms of tensorial quantities and in particular the fourthorder elasticity or sti ness tensor describing hookes law. Non elastic impression materials by hend din on prezi. Elastomeric impression materials offer high elastic recovery and acceptable flexibility on removal of the impression from the mouth. Module 3 constitutive equations learning objectives understand basic stressstrain response of engineering materials. Elastic materials have a soft consistency but after setting, they become elastic.
This classification is based on the capability of the material to withdraw over the undercuts it has set. Lowcost, wetting and visco elastic properties make a possibility to use alginate in dental area, especially as impression materials 54,55. The ideal impression material should exhibit adequate mechanical properties to withstand stresses under various clinical scenarios. Elastic impression materials are capable of accurately reproducing both the hard and the soft structures of the mouth including the undercut areas and interproximal spaces 4. Recently, new elastomeric impression materials with very high elastic recovery and high tear strength have been. Ppt impression materials powerpoint presentation free. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from. Contemporary dentistry generates new information every year and digital dentistry is becoming established and influential. Impression materials are commonly classified by their elastic properties once set. Classification of impression materials junior dentist. They reproduce an imprint faithfully, providing details of a high definition despite the presence of undercuts. Scribd is the worlds largest social reading and publishing site. Many impression materials have an elastic recovery of more than 99%.
The greater the strainincompression, the more fl exible is the material. The plaster should be mixed with water or an antiexpansion solution in the ratio of 100g to 5060ml. Impression materials set by che mical reactions to form elastic rubber materials are called thermoset. Impression plaster impression compound zinc oxide eugenol impression waxes impression plaster plaster of paris composition. Topic 06 inelastic behavior of materials and structures. It is made by placing an appropriate material in a stock or custom dental impression tray which is designed to roughly fit over the dental arches. Exhibit insignificant amount of elastic deformation when subjected to bending or tensile stresses. Nonelastic impression material free download as powerpoint presentation. Illustrates inelastic behavior of materials and structures. Tylman award, sponsored by the american academy of crown and bridge prosthodontics. This material is used for recording edentulous ridges in a close fitting special tray or the patients existing dentures. Available in the form of sheets, cakes, discs and sticks. Mechanical chemical surgical classification of impression materials non elastic disadvantages.
Then a brief description of the most common cases of material. Elastomeric materials include polysulfide, polyether, condensationcured silicone, and additioncured silicone. Of particular interest has been the effect of disinfection solutions on the. Read comparative elasticity tests for elastomeric non putty impression materials, australian dental journal on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Elastomeric impression materials addition silicones and polyethers offer high elastic recovery and acceptable flexibility on removal of the impression from the mouth. Elastic impression materials are those that remain in an elastic or flexible state after they have been removed from the mouth. A technique for combining the advantages of an impression of the teeth made in an elastic impression material with those of a functional wax impression of the soft tissues has been described. A dental impression is a negative imprint of hard teeth and soft tissues in the mouth from which a positive reproduction cast or model can be formed. Shop elastic thread, waistband elastic, and other elastic material for sewing and crafting projects. Only a proper dental checkup by a professional in person can help diagnose the problem you are suffering from and help give you the required treatment. The chemical reaction invo lves chain lengthening, crosslinking, or both. Since that time and especially in the past decade, these materials have gained in their acceptance and account for a large share of the impression material market. The silicone impression materials are classified according to the type of chemical reaction by which they set. How to be productive at home from a remote work veteran.
Hence impression materials are classified as being elastic or non elastic. Mechanical properties of elastomeric impression materials. Non toxicity and nonirritating characterisitic makes. Other impression materials set by a physical change when they cool, either by solidification or by gelation. Elastic dental impressions, introduction to elastomers, silicones silicones. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Recent advances in impression materials by tarek anwar on. Major advances in impression materials and their application have occurred during the last decade, with greater emphasis being placed on rubber impression materials than on dental compound, zinc oxideeugenol, and agar and alginate. The polyvinyl siloxane impression materials are addition reaction silicone elastomers which were first introduced in the 1970s.
They are easy to handle and their accuracy is pretty good. An impression should return to its original dimensions after removal from undercut areas in the mouth. Pdf impression techniques in removable partial denture. Alginate materials and dental impression technique.
What is classification of under elastic and non elastic impression material, i need enumarte subclassification and name answered by a verified dentist we use cookies to give you the best possible experience on our website. Recently, new elastomeric impression materials have been introduced, with the. Nonaqueous impression materials shelf life check package box for stamped date tubes are crimped and dated on ends use a permanent pen to mark boxes or tubes in the office if bulk amount was purchased. Non elastic impression materials non elastic impression materials impression plaster zincoxide eugenol impression paste impression compound 14 15. Initially, a general description of the constitutiv e relationships asso ciated with material non linearit y in solid mec hanics is presen ted. Shrinking of impression over time non toxic and non irritant very elastic near ideal advantages. Impression material an overview sciencedirect topics. Zinc oxide eugenol impression pastes iiz main types of inelastic impression materials. Elastic material susceptible to being stretched compressed or distorted and then tending to resume the original shape. Pdf elastic and plastic properties of elastic dental.
1336 510 1149 1022 733 200 827 1300 655 184 155 685 886 1432 584 543 1072 509 1053 324 1335 1154 937 1419 739 1555 154 315 66 1173 270 811 1520 650 1141 912 1234 107 657 72 1396 1497 662 1294 852 318