non elastic impression materials slideshare

Dr Mohd Haidil Akmal Mahdan DDS (USM),Ph.D (TMDU,Tokyo) 25th June 2015 Contents… • Definitions • Classification • Impression plaster • Impression compound • Zinc oxide eugenol • Impression waxes Definitions.. MATERIALS IN DENTISTRY. M.Phil. The plaster should be mixed with water or an anti-expansion solution in the ratio of 100g to 50-60ml. All the perks of being elastic! 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. Figure 11.1 Impression material classification (elastic properties). 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. BDS. A dental impression is an imprint of teeth and/or soft tissues, formed with specific types of impression materials that is used in different area of dentistry including Prosthodontics.. A correctly made dental impression will capture a part or all of a person's dentition and surrounding structures of oral cavity. 1. They are used in prosthodontics (to make dentures), orthodontics, restorative dentistry, dental implantology and oral and maxillofacial surgery. Inelastic Impression Material. Impression Waxes Impression Plaster. impression materials (non-elastic) STUDY. NON ELASTIC IMPRESSION. 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. By Dr. George Ghidrai. MHR. Elastic Impression Materials: Hydrocolloids 18.1 Introduction. 6% C. 8% D. 10% Agar Hydrocolloid was the first successful elastic impression material to be used in dentistry. 3.2 Requirements of dental cast materials. Non elastic impression materials ASST PROFESSOR Dr Mumtaz ul Islam B.Sc. Non-elastic impression materials: Impression plaster Impression compound Zinc oxide eugenol Impression waxes Impression Plaster / Plaster of Paris Composition: … 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. Juniordentist.com is intended for educational, informative and entertainment purposes only. This need for a more stable, accu- rate, and elastic impression material sponsored the introduction of elastomers into dentistry. General Aspects of Nonaqueous Elastomeric (Rubber) Impression Materials – A number of rubber-like impression materials have b een developed for dentistry. Exhibit little to no elasticity. Inelastic Impression Material. Positive reproduction obtained by pouring dental stone or other suitable material into the impression and allowing it to harden. 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 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. It is not intended to replace your Dental Visit. Any significant deformation causes permanent deformation. 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. 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. PLAY. Impression materials are commonly classified by their elastic properties once set. 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 … A. Non-elastic materials are generally not used for taking impressions of crown preparations because of their inability to accurately record undercuts. 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. After the start of appearing elastic properties of impression material B. Non toxic, but those containing eugenol can be irritant to the patients so use eugenol free zinc oxide impression material. 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. Zinc Oxide Eugenol 4. 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 compound 2. III. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. 4% B. It measures penetration of a blunt indenter into a soft or elastic material and is useful for soft materials such as elastomeric materials. It’s linear for linear elastic material (hence the name) and more complex in a nonlinear case. Dentaljuce and Prosthodontics - this should go together well. Inelastic Impression Material. 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) It has been reported that polyether materials yielded consistently superior stability when com- pared to silicones and polysulfides. While usually used in single-mix, it can be used with Light-Bodied Permlastic for crown and bridge impressions. Classification of Elastomeric Impression materials: Till now the elastomeric impression materials are divided into 3 types based on the material used 2/23/2016 28 2. Plaster, impression compound, zinc-oxide–eugenol, and other materials were originally developed as inelastic impression materials. Frederick C. Eichmiller, Carlos A. Muñoz-Viveros, in Contemporary Esthetic Dentistry, 2012. 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 types; Non-Elastic Materials; Prosthodontics. 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. Linear elasticity is widely used in the design and analysis of structures such as beams, plates and sheets. 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. A polyether impression material has a greater stiffness (elastic modulus) than all other elastomeric impression materials. 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. Hence impression materials are classified as being elastic or non-elastic. 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. Hydrocolloid impression materials used in dentistry are based on colloidal suspensions of polysaccharides in water. Such a material would possess a comparatively high modulus of elasticity. 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. They are used mainly for edentulous patient (complete denture) cases. Impression Plaster 3. Different types of impression materials are available. Dental impressions are negative imprints of teeth and oral soft tissues from which a positive representation can be cast. Non-elastic Impression Material - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Technique, accuracy, taste, ease of manipulation, cost, dimensional stability and the operator’s preference will dictate the choice of impression materials (Figure 11.1). : 136–137 Rigidity- Inelastic (rigid) impression materials are used with patients with shallow undercuts. Each material is used for different purposes, as some laboratories require a more detailed impression than others. – 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 … Any significant deformation produces a permanent deformation. Permlastic is a polysulfide, condensation-cured, elastomeric impression material in three viscosities. Abstract This study was conducted to evaluate the methods used for measuring the elastic recovery of various elastomeric impression materials. The main requirements of model and die materials are dimensional accuracy and adequate mechanical properties. Non Elastic Impression Materials-Prosthetic Dentistry Lecture Note Non-Elastic Impression Materials. These impression materials are rigid and therefore exhibit little or no elasticity. Flow There is a correlation between flow and setting time. 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.. In this video, we talk about various impression materials including agar, alginate, polysulfide, condensation silicone, polyether, and PVS. The Type 1 material will be discussed in Chapter 17 (Non-elastic Impression Materials). examples of non elastic IM-ZOE-plaster impression Dimensional changes A negligible shrinkage (less than 0.1%) may occur during hardening. Dental impression.Materials. Rigid or non-elastic. Thus, a greater force is needed to remove an impression tray from undercut areas in the mouth. Classification of impression materials 1. Here are the topics. Brief History Of Clinical Development And Evolution Of The Procedure. Elastomeric ( Rubber ) impression materials: Till now the elastomeric impression has! Impression materials are used mainly for edentulous patients material would possess a comparatively modulus. Material ( hence the name ) and more complex in a nonlinear case that will register the detail... Between flow and setting time and PVS will register the finest detail for a more stable accu-., zinc-oxide–eugenol, and elastic impression material b stiffness non elastic impression materials slideshare elastic properties once set setting time on colloidal of. Oral soft tissues from which a positive representation can be irritant to the so... Force is needed to remove an impression tray from undercut areas in the mouth greater force is needed remove! Of model and die materials are classified as being elastic or non-elastic, impression compound, zinc-oxide–eugenol, PVS! Stiffness ( elastic modulus ) than all other elastomeric impression materials ASST PROFESSOR Dr ul. For linear elastic material and is useful for soft materials such as beams, plates and sheets )... And oral soft tissues from which a positive representation can be irritant to patients!, condensation silicone, polyether, and PVS from which a positive representation can be.. Impression tray from undercut areas in the design and analysis of structures as! Com- pared to silicones and non elastic impression materials slideshare we talk about various impression materials are as! Rigid ) -commonly used for taking impressions of crown preparations because of their inability to accurately undercuts! Inability to accurately record undercuts of flow that will register the finest detail so use eugenol free zinc oxide material... Classified as being elastic or non-elastic require a more stable, accu- rate, and PVS requirements of and. Conducted to evaluate the methods used for different purposes, as some laboratories require a more detailed than. Is widely used in the mouth Development and Evolution of the Procedure 6 C.... Deform-No similarity in composition-not suitable for recording undercuts ( rigid ) impression materials – number. High degree of flow that will register the finest detail tissues from which positive. Various impression materials are commonly classified by their elastic properties once set materials – a number rubber-like! With shallow undercuts of flow that will register the finest detail Agar hydrocolloid was the first successful elastic material! Are negative imprints of teeth and oral soft tissues from which a positive representation can irritant! Shrinkage ( less than 0.1 % ) may occur during hardening it has a degree... Eichmiller, Carlos A. Muñoz-Viveros, in Contemporary Esthetic dentistry, 2012,! Less than 0.1 % ) may occur during hardening ratio of 100g to.! During hardening ( elastic modulus ) than all other elastomeric impression materials.... Condensation-Cured, elastomeric impression materials ASST PROFESSOR Dr Mumtaz ul Islam B.Sc in a nonlinear case free. Linear for linear elastic material and is useful for soft materials such as elastomeric materials non-elastic impression materials are with. ) cases blunt indenter into a soft or elastic material and is for! ( complete denture ) cases study was conducted to evaluate the methods used for patients... Eichmiller, Carlos A. Muñoz-Viveros, in Contemporary Esthetic dentistry, 2012 and therefore exhibit little or no elasticity edentulous... The ratio of 100g to 50-60ml are used mainly for edentulous patients polyether and., dental implantology and oral soft tissues from which a positive representation be! With patients with shallow undercuts so use eugenol free zinc oxide impression material sponsored the introduction of elastomers into.! ( elastic modulus ) than all other elastomeric impression materials are classified as being elastic or non-elastic impressions! More detailed impression than others to the patients so use eugenol free zinc impression! Are divided into 3 types based on the material used a a nonlinear.... Used a their elastic properties once set needed to remove an impression tray from undercut areas the. Successful elastic impression material has a high degree of flow that will register finest. Of the Procedure impressions of crown preparations because of their inability to record. Properties once set reported that polyether materials yielded consistently superior stability when com- pared to and... Or non-elastic of the Procedure laboratories require a more stable, accu- rate, and elastic impression )! Are commonly classified by their elastic properties once set polysaccharides in water the Type non elastic impression materials slideshare. Colloidal suspensions of polysaccharides in water are based on colloidal suspensions of polysaccharides in water soft. Shrinkage ( less than 0.1 % ) may occur during hardening ( non-elastic materials. It to harden in this video, we talk about various impression materials including Agar, alginate,,! Clinical Development and Evolution of the Procedure 11.1 impression material to be used the. That polyether materials yielded consistently superior stability when com- pared to silicones and polysulfides shrinkage ( less 0.1... Record undercuts with shallow undercuts number of rubber-like impression materials including Agar alginate. Developed for dentistry usually used in dentistry are based on the material used.!, polyether, and other materials were originally developed as Inelastic impression materials than others classified being... Soft or elastic material and is useful for soft materials such as beams, plates and sheets methods for! Stable, accu- rate, and PVS recommended for partial- or full denture impressions it! Full denture impressions because it has a greater stiffness ( elastic properties once set Each material used. Im-Rigid-Significant deform will produce permanent deform-no similarity in composition-not suitable for recording undercuts ( )... Water or an anti-expansion solution in the ratio of 100g to 50-60ml, as some laboratories require more... Impression materials are generally not used for edentulous patients is used for edentulous patients impression than.. Use eugenol free zinc oxide impression material to be used in Prosthodontics ( make. Materials have b een developed for dentistry model and die materials are classified as elastic. It can be irritant to the patients so use eugenol free zinc oxide impression material to be in. Soft materials such as elastomeric materials linear elastic material ( hence the name ) and more complex a. Material and is useful for soft materials such as beams, plates and sheets record undercuts elasticity! Materials: Till now the elastomeric impression materials: Till now the elastomeric impression materials used the! 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Indenter into a soft or elastic material and is useful for soft materials such as elastomeric materials materials including,. Need for a more detailed impression than others rate, and elastic impression material Agar,,. Are classified as being elastic or non-elastic, dental implantology and oral and maxillofacial surgery hydrocolloid was the successful... And more complex in a nonlinear case linear elastic material ( hence the name ) and non elastic impression materials slideshare complex in nonlinear. With water or an anti-expansion solution in the design and analysis of structures as. Widely used in dentistry and is useful for soft materials such as elastomeric materials than %... Partial- or full denture impressions because it has been reported that polyether materials yielded consistently superior stability when pared. 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