non elastic impression materials slideshare

Non-elastic impression materials: Impression plaster Impression compound Zinc oxide eugenol Impression waxes Impression Plaster / Plaster of Paris Composition: … 1. It has been reported that polyether materials yielded consistently superior stability when com- pared to silicones and polysulfides. Non elastic impression materials ASST PROFESSOR Dr Mumtaz ul Islam B.Sc. Plaster, impression compound, zinc-oxide–eugenol, and other materials were originally developed as inelastic impression materials. This need for a more stable, accu- rate, and elastic impression material sponsored the introduction of elastomers into dentistry. These impression materials are rigid and therefore exhibit little or no elasticity. Non Elastic Impression Materials-Prosthetic Dentistry Lecture Note Non-Elastic Impression Materials. The plaster should be mixed with water or an anti-expansion solution in the ratio of 100g to 50-60ml. MHR. NON ELASTIC IMPRESSION. impression materials (non-elastic) STUDY. Impression compound 2. Agar Hydrocolloid was the first successful elastic impression material to be used in dentistry. 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. Dental impressions are negative imprints of teeth and oral soft tissues from which a positive representation can be cast. Such a material would possess a comparatively high modulus of elasticity. – A variety of names are used to describe this group of materials: non aqueous elastomeric impression ma terials, rubber base materials, elastomers, and other s. – These materials set via polymerization rea ctions and are … Classification of impression materials 1. Impression materials are commonly classified by their elastic properties once set. Positive reproduction obtained by pouring dental stone or other suitable material into the impression and allowing it to harden. According to elastic properties Non-elastic or rigid materials o Impression plaster o Impression compound o Zinc oxide eugenol o Impression waxes Synthetic elastomers-polysulfides Elastic materials silicones polyethers Hydrocolloids – reversible (agar), irreversible (alginate) The Elastic materials Are those materials that have the ability to resist a distorting or deforming influence or force, and then return to their original shape and size when the same force is removed.. BDS. Here are the topics. 2. Flow There is a correlation between flow and setting time. Dental impression.Materials. Elastic Impression Materials: Hydrocolloids 18.1 Introduction. A lower hardness is less stiff and will feel softer or spongier to the hand, so a rubber band has a lower shore hardness than a car tire. Impression types; Non-Elastic Materials; Prosthodontics. MATERIALS IN DENTISTRY. 4% B. Technique, accuracy, taste, ease of manipulation, cost, dimensional stability and the operator’s preference will dictate the choice of impression materials (Figure 11.1). Juniordentist.com is intended for educational, informative and entertainment purposes only. Permlastic is a polysulfide, condensation-cured, elastomeric impression material in three viscosities. Rigid or non-elastic. Each material is used for different purposes, as some laboratories require a more detailed impression than others. Non toxic, but those containing eugenol can be irritant to the patients so use eugenol free zinc oxide impression material. M.Phil. It measures penetration of a blunt indenter into a soft or elastic material and is useful for soft materials such as elastomeric materials. 6% C. 8% D. 10% Storage stability There is usually a significant delay between the taking of an impression and its arrival in the dental laboratory where the model is poured. Dimensional changes A negligible shrinkage (less than 0.1%) may occur during hardening. Hence impression materials are classified as being elastic or non-elastic. Dentaljuce and Prosthodontics - this should go together well. The main requirements of model and die materials are dimensional accuracy and adequate mechanical properties. Hydrocolloid impression materials used in dentistry are based on colloidal suspensions of polysaccharides in water. The time from start of mixing till just before the start of appearing elastic properties of impression material C. Loss of luster of impression material D. None of the above # Minimum flow of type I impression compound at mouth temperature is : A. Inelastic Impression Material. Any significant deformation causes permanent deformation. By Dr. George Ghidrai. Regular Permlastic is recommended for partial- or full denture impressions because it has a high degree of flow that will register the finest detail. Impression materials are classified as In Elastic and Elastic InElastic are further divided into impression plaster impression compound impression wax elastic impression are divided into synthetic elastomers and Hydrocolloids synthetic elastomers 1)polysulfide 2)polyether 3) silicones a)addition silicones b) condensation silicone Hydrocolloids are divided into reversible hydrocolloids … Frederick C. Eichmiller, Carlos A. Muñoz-Viveros, in Contemporary Esthetic Dentistry, 2012. Impression Waxes Impression Plaster. The Type 1 material will be discussed in Chapter 17 (Non-elastic Impression Materials). Different types of impression materials are available. In this video, we talk about various impression materials including agar, alginate, polysulfide, condensation silicone, polyether, and PVS. Inelastic Impression Material. polyether impression material, and two different viscosities of an addition silicone impression material after long-term impression materials tested were Impregum F, Extrude Extra, and Extrude Wash, and all were tested by use of the Wilhelmy technique; first, for the non disinfected state, which served as controls, and then after 1 and 18 hours of General Aspects of Nonaqueous Elastomeric (Rubber) Impression Materials – A number of rubber-like impression materials have b een developed for dentistry. Inelastic Impression Material. Thus, a greater force is needed to remove an impression tray from undercut areas in the mouth. III. 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. 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. Exhibit little to no elasticity. They are used mainly for edentulous patient (complete denture) cases. A polyether impression material has a greater stiffness (elastic modulus) than all other elastomeric impression materials. It is not intended to replace your Dental Visit. Linear elasticity is widely used in the design and analysis of structures such as beams, plates and sheets. All the perks of being elastic! Brief History Of Clinical Development And Evolution Of The Procedure. 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 Impression Plaster 3. The elastic impression materials must then be used, but, as most are actually viscoelastic materials (see Chapter 1.6), there is a possibility of some permanent deformation. 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 recovery following strain. 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. They are used in prosthodontics (to make dentures), orthodontics, restorative dentistry, dental implantology and oral and maxillofacial surgery. 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. I think it’s worth taking a look, because confusing nonlinear elastic material and a plastic material may produce some funky outcomes in some analysis. 2/23/2016 28 PLAY. Classification of Elastomeric Impression materials: Till now the elastomeric impression materials are divided into 3 types based on the material used : 136–137 Rigidity- Inelastic (rigid) impression materials are used with patients with shallow undercuts. 3.2 Requirements of dental cast materials. Zinc Oxide Eugenol 4. 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. 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. Any significant deformation produces a permanent deformation. 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