>> The most significant work in this area since 1966 is reviewed below. Current Impression Materials Rei~bick1 stated either high or low viscosity materials produced the same degree of accuracy and stability. 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Of these, addition silicone and polyether are … 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. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 15 0 R] /MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> %���� Applied Dental Materials Ninth Edition John F. McCabe BSc, PhD, DSc Professor of Dental Materials Science Newcastle University Angus W.G. Full Document, University of the East, Manila • ENGLISH 20. • • he said this in lecture but I don’t understand so I emailed him types of elastomeric impresion material o polysulfide, silicone, polyether, polyvinyl siloxane o these types all polymerize why remove impression quickly from mouth? Download PDF View details Digital workflow for the design and additively manufacture of a splinted framework and custom tray for the impression of multiple implants: A dental technique 2018, Journal of Prosthetic Dentistry Of particular interest has been the effect of disinfection solutions on the qualities of impressions and the biocompatibility of impression materials. Elastic impression materials are used more extensively than rigid materials, because elastic materials flex from tissue undercuts when removed from the mouth, whereas rigid materials cannot. § May have to cut out the impression with polyvinyl siloxane § PE and PVS (A-­‐S) is very stif o Lowe elastic modulus and high tear strength good sometimes with polysulfide Complex stressed during impression o Material sticks to tooth à dimensional changes possible Modeling viscoelastic behavior o Can model this with springs and dash pots o Measure stretch and recovery Viscoelastic behavior medles o Can only pull the shock absorber at a certain rate Parallel elements o Dsashpot = a shock absorber o In parallel spring pulls on dashpot but it takes longer Model combinations in compression ~ real world o Once it changes dimension doesn’t want to come back o Everything else recovered elastically o There is an amount of permanent deformation Creep = visoelastic flow eprmanent set o Viscoelastic à you ckeep the load on à get deformation and won’t recover o Don’t want the viscous element to act very long à that’s why you remove it very quickly o Oly come a little bit up the curve on the graph Creep compliance o Spring element with a polyether à if u remove it will ome back o Polysulfide gets the most change o These materials much better with elastic behavior Comparitive physical prperieis o Very low values are good o Measure by putting the weight on à does it recover à how much Tear strenth improtant o Don’t want a tear down in the sulcus that you don’t see and don’t remove o Repsonse to these materials over a few days is equisite o Check in the mouth and check impression Cell response o Look at cell viability o Polyether is the worst – nice properties but don’t leave it in the sulcus o Tremendous inflamation and bone loss may result o PS rubber not bad at all < alginate < ZOE paste < PE (worst) Tear strength testing Tear strength test o Monitor how much force it takes etc. The plaster should be mixed with water or an anti-expansion solution in the ratio of 100g to 50-60ml. This updated thoroughly revised and revamped edition would serve the students, teachers and professionals associated with clinical dentistry. crowns and for bridges? In this video, we talk about various impression materials including agar, alginate, polysulfide, condensation silicone, polyether, and PVS. ELASTIC Impression MATERIALS ABHISHEK KAVLEKAR 3. 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. The mix should be a smooth paste, free of air bubbles, which may appear on the surface of the impression leading to inaccuracy. It is aimed primarily at undergraduate dental students, although it will also be useful for practising dentists, dental technicians and dental assistants. The operating principle involves the application of a fixed compressive strain and the resulting stress is measured. There are four kinds of Elastomers used as impression materials viz., polysulfide, condensation silicone, addition silicone and polyether. • • o Don’t want bubbles in the dies § And also when you put matterial on stone § so die stone will wet into it and you won’t have bubbles in dies o Want good wettability with tissue and with water o Need modifications to achieve this Relative wettability of polymeric impression materials o Polyvinyl siloxane: High contact angle with water à need to modify à lower contact angle so it can compete with polyether o PE better > than PVS (AS) o AS used to be hydrophobic (high contact angle) o PE > hydrophilic AS (modified) > PS > hydrophobic AS > CS (condensation silicone) Contact angles on moiste dentin… o Want to lower Preparation pretreatments o Want to we the tooth structure o Can add a surfactant to wet the tooth structure Change with surfacting applicatoin o Light body material on the tooth o B4 materal helps it slide down the tooth surface o Get more detail by using this B4 stuff – more wetability – lower contact angle Recommending disinfection techniques o Don’t want to swell the impression material o Don’t apply more than 10-­‐ minutes or else get swelling o Polyether à use chorline type compounds / iodifores o Gluteraldehydes can’t be used with polyether Web based impression update o Can find this overview Digital impression – multiple slides o Lab builds the dye to replicate what you’ve captured o Lava system is good – oral system from MIT § 20 scans perminute à comes up with a dye § then can get the CAD CAM o cadent itero § lets you know if you have clearance o used to have to put powder on teeth to give computer an opque surface but now u don’t need that § ciraq used to need that and some still do mouthguard elastomers o ethyl vinyl acetate o need 3mm thick for sports o heat process – drape over a die o 4mm à heat à become 3mm o impact force à energy to distort material à tooth protected bc displacement is limited o can use impact tester with a weight that drops down o 2010 study comparing the air / water / artificial saliva systems § polyshock sets the standard for these materials § it’s a combo of the eva and proform ...View After the preparation, they are placed inside impression trays. 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 oxide-eugenol, and agar and alginate. 3 0 obj The elastic impression materials are most generally used for the making of impressions for removable partial dentures, immediate dentures, and crowns • • • • • • o Many components o Take a polymer à cross link it à make it elastic o Problem is that polymerization leads to shrinkage à solution? Does high viscoelasticity mean stiff? The impression taken should be highly precise, thus, requiring specific care when manipulatingthese 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. 19.1 Bondoc2 measured the percent per-manent deformation and strain in compres- sion for silicone-based materials according to American Dental Association Specification no. Elastic Impression Materials: Hydrocolloids 18.1 Introduction. 1. Why is the elastic modulus of the set impression material important 0.1% shrinkage o 0.1% x 8000 microns for 1 tooth à 8 microns à 4 microns on mesial or distal o There is adhesive on the tray and also mechanical retention – shrinks in that direction o So dies are oversized usually o Short on occlusal ? In hydrocolloid, polysulfide or silicone, the molar crown preparation was the most sensitive to dif- ferences between the materials. This updated thoroughly revised and revamped edition would serve the students, teachers and professionals associated with clinical dentistry. Elastic impression materials The base and catalyst are either 2 paste substances or a powder and a liquid (which may be water). Elastic impression compositions Download PDF Info Publication number US2359512A. Plus, the material’s excellent dimensional stability and elastic recovery ensures the impression arrives at the lab in the same condition it left your patient’s mouth. impression material is non elastic when set and so will not record under cuts accurately.9 Another limitation of impression compound is that it can only be used with non perforated stock trays which are not easily available nowadays and also the operator may burn the soft tissue of the patient inadvertently during its manipulation. All “elastic impression materials” have the same gener al type of formulation. They all have a flexible matrix (the continuous phase) that is filled with extender or filler (the dispersed phase) to minimize the effects of polymerization shrinkage during setting on the overall accuracy and dimensional stability of the system. Be easy to use with minimum equipments. 2 0 obj Why impression material should be removed quickly from the mouth? Compound impression can be added or corrected. Elastic impression compositions Download PDF Info Publication number US2359512A. o (fast/short set time > slow): Addition silicone (PVS) > polyether > condensation silicone > polysulfide rubber Working time problems o In lab it takes for ever to set o But in the mouth it all happens faster o May have various layers where they don’t mix / steps Impression concerns o Make sure all the materials get to the mouth and there is no delay o Don’t want material in the tray to start setting without u knowning o May be elastic and may still also be flowing o We may be compressing it but it may recover once you remove it o Set in elastic state à Remove tray à impression rebounds à Might have a short and distorted die o Lab, not a problem, mouth is a problem o Want material freshly mixed and “dead soft” Impression materials o All has to do with rxn conversion o At 50% conversion à they all get rubbery o With PE and PVS very much in a hurry o They all set at different rates factors affection impression / dimensional stability / accuracy o polymerization shrinkage is immediate but … § there is a potential for longterm shrinkage with biproduct o when u remove it gets distored à will it recover elastically? • • • • What does 0.1% shrinkage mean clinically? Elastic materials have a soft consistency but after setting, they become elastic. Generally, they can be easily stretched and rapidly recover their original dimensions when … Elastic Impression Materials - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Alginate, Jeltrate (regular), Xantalgin (normal) and Zelgan had long working time. Elastomeric Impression Materials Elastomers comprise a group of synthetic polymer-based impression materials that are chemically cross-linked when set and that can be stretched and yet rapidly recover to their original dimensions, like vulcanized natural rubber when the applied stress is released. Juniordentist.com is intended for educational, informative and entertainment purposes only. Alginates are the most used impression materials in all dental practices. Basic Dental Materials by Manappallil PDF, ePub eBook D0wnl0ad Serves as a keystone to the understanding of Basic Dental Materials in general and their application to clinical dentistry in particular. ! 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 oxide-eugenol, and agar and alginate. Elastic impression materials include reversible (agar-agar), irreversible (alginate) hydrocolloids and synthetic elastomers (polysulfides, polyethers, silicones). 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.. o Shorter OG à crown short à open margins especially buccally o Wider BL / MD à crown over extended • • • • • US2359512A US479446A US47944643A US2359512A US 2359512 A US2359512 A US 2359512A US 479446 A US479446 A US 479446A US 47944643 A US47944643 A US 47944643A US 2359512 A US2359512 A US 2359512A Authority US United States Prior art keywords alginate impression water soluble insoluble … percolation The pumping of oral fluids in and out at the tooth-restoration interface as the restoration contracts and expands with temperature changes. 9.1 Failure of Elastic Materials In terms of material behavior, failure means a change in the normal constitutive behavior of a material, usually in response to excessive loads or deformations that cause irreparable changes to the microstructure. 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elastic impression materials pdf

Thus, the minimum thickness of the material in the tray should be three to four times more than the largest undercut (Hamalian, T. A. et al., 2011). Cresson3 suggested the revision of the testing procedure for compressive strengths of dental elastic impression materials that would apply the load at the rate of 18,000 Gm. Recently, new elastomeric impression materials with very high elastic recovery and high tear strength have been introduced. • silicones differ from addition silicones (polyvinyl siloxane) and Elastic materials have a soft consistency but after setting, they become elastic. Material susceptible to being stretched compressed or distorted and then tending to resume the original shape. • There are 4 groups of elastomers; polysulfide, condensation silicone, addition silicone and polyether; each differ in their setting mecha … [Elastomeric impression materials] Refuat Hapeh Vehashinayim (1993). The creep compliance is the time-dependent relationship of the strain to stress ratio of a material under load. • § dimension change is greatest § shrinks the most o ?Heavy body § is almost like a putty o ?Putty setting reaction & dimensional stability o polysulfide rubber & condensation silicone § both have biproducts of rxn (water & alcohol, respectively) § both have dimensional Instability overtime § longest set time o polysulfide (aka PS) § lead peroxide accelerator / catalyst which used to x-­‐link sulfide groups § x-­‐linking sulfide groups à smelly like Hsulfide § lack of elastic properties § restorations may fit die but not patient § used to use lead peroxides which split off water § it’s a condensation rxn or step growth polymerization § implication is that if u leave it for a long time à water biproduct out à shrinkage § accurate but only for a short period of time § longest to set § low elastic modulus à good for undercuts à easy removal o condensation silicone (aka Silicone) § next material to come along § cleaner / better to work with § x-­‐link xn of silolyl chains § stannous octoate catalys à multiple x-­link point § split off alcohol / alcohol byproduct à dimensional Instability § second longest set time o addition silicones (aka PVS, A-­‐Silicone, A-­‐S, VPS) § change it to an addition reaction à many advantages § vinyl grps along the chains à it’s a free radical rxn à § less shrinkage § no biproduct just x-­‐linked polymer § catalyzed by platinum salt to give x-­‐link structure § but no biproduct § rapid à nice x-­‐link § good dimensional stability with time § once it set à initial shrinkage and that s it à little after that § fastest set time § stiff à high elastic moduls à difficult removal for undercuts o poly-­‐ether (aka PE) § another competitor for crown & bridge products § opening ring structure gives you less shrinkage § same with epoxies (use re-­‐opening procedure) § gives a rapid and complete convient rxn § 2nd fastest set time § stiff à high elastic moduls à difficult removal for undercuts dimensional stability and linear dimensonal change with time o A-­‐S > PE > PS > silicone Shrinkage in tray à what happens to die? ELASTIC Material susceptible to being stretched compressed or distorted and then tending to resume the original shape. HENKE-PRESS – Application syringe for elastic impression materials . of "elastic" impression materials are ob-tained from tests similar to those described in American Dental Association Specification no. of elastic impression materials. per minute. F i n g e r 1, M. K o m a t s u 2 1Department of Prosthetic Dentistry and Dental Technology, Dental School of the RWTH, Aachen, W, Germany and 2Department of of elastic dental Operative Dentistry, Dental School, Tohuku University, Sendal, Japan impression materials Finger W, Komatsu M. Elastic and plastic properties of elastic dental impression materials. Pakistan Oral & Dental Journal ol 35, No. As the material is reversible, it can be re-used, but after sterilization. of elastic impression materials. o went to copper peroxide gave less problems but no advantage o need to poor it right away polysulfide rubber o don’t leave out too long or else it would mix automatically / accidentally polysulfide rubber mixing o mix with a “metal pen” grasp then flat o had to load a syringe with this tray prolems with poor mxing o mixing was a problem and it was hard to know o became apparent only after you removed the tray o good mixing is a concern with hand mixing systems condenstation silicone setting rxn o next material to come along o cleaner / better to work with o x-­‐link xn of silolyl chains o stannous octoate catalys à multiple x-­‐link point o split off alcohol / alcohol byproduct à dimensional change o a condensation rxn with this byproduct o lose dimensional stability though polyvinyl siloxane (addition silicone) ingredients o change it to an addition reaction à many advantages o vinyl grps along the chains à it’s a free radical rxn à o less shrinkage o no biproduct just x-­‐linked polymer addition silicone (vinyl polysiloxine) setting rxn o catalyzed by platinum salt to give x-­‐link structure o but no biproduct o rapid à nice x-­‐link o good dimensional stability with time o once it set à initial shrinkage and that s it à little after that polyvinyl siloxane – out-­‐gassing (problems) o platinum catylist would split off hydrogen à used to get a lot of bubbles esp when pouring stone o palladium absorbed the hydrogen and that got rid of this problem o we have this well matured system now with PVS – less problems polyether setting rxn o another competitor for crown & bridge products o opening ring structure gives you less shrinkage o same with epoxies (use re-­‐opening procedure) o gives a rapid and complete convient rxn • • • • • • • • elastomeric impression materials o working times – they set rapidly o compared to original polysuflfide – better faster setting with polyether working time characteristics o poly ether = very much a snap set (more so than A-­‐silicone) but both set fast o polysulfide would come way out here and way out here? ! ! This instrument has been called a Comprheometer. • • • • • • • • They reproduce an imprint faithfully, providing details of a high definition despite the presence of undercuts. Have adequate shelf life for storage and distribution. § Having long polymer chains helps to à dilute out shrinkage with particle § Diluter particle also dilutes shrinkage o Heavier consistency à less shrinkage o Light body shrinks more / just depends on filler Impression materials / key properties Elastomeric impressions o Can use light body first then fill tray with heavy body o As it sets, still have shrinkage o Shrink toward bonded area (like composite) / shrink toward the tray o There is adhesive on the tray and also mechanical retention – shrinks in that direction § So dies are oversized usually § Short occlusally? Elastic and plastic properties W . 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 concept of impression making process in dentistry began in the mid 1800s. %PDF-1.5 Impression Waxes Impression Plaster . 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. The operating principle involves the application of a fixed compressive strain and the resulting stress is measured. They are capable of accurately reproducing both the hard and soft structures of the mouth, including the undercuts and interproximal spaces. There are several elastic impression materials available for dental use: synthetic elastomeric ma-terials, including polysulfide, condensation silicone, addition silicone and polyether; and hydrocolloids.6,7 All these materials are used for reproducing oral conditions in order to construct restorations. 5. Request PDF | The Historical Evolution of Dental Impression Materials. Hydrocolloids were the first elastic materials to be used in the dental field. 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. How does a light body impression material differ from a medium body Many impression materials have an elastic recovery of more than 99%. Abstract This study was conducted to evaluate the methods used for measuring the elastic recovery of various elastomeric impression materials. MATERIALS IN DENTISTRY. 6 CONTRAINTES ET DÉFORMATIONS 6.1 CHARGEMENT UNIAXIAL 6.1.1 Introduction Lorsqu'un corps est soumis à des forces extérieures, il y a un changement de sa forme ou de ses Reproduction of oral detail The rubber impression materials are capable of reproducing detail more accurately than can be transferred to the stone die or cast ELASTICITY Elastic properties of elastomeric impression materials improve with an increase in curing time in the mouth Permanent deformation following strain in compression increases in following order- addition silicone, … NON ELASTIC IMPRESSION. Wouldn’t it be high if it is oversized. Impression compound 2. How does the setting reaction of polysulfide and condensation • • The completed impression forms a negative reproduction of the teeth and tissues. NON ELASTIC IMPRESSION. 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. The higher this value, the more tear resistant is the material. • They reproduce an imprint faithfully, providing details of a high definition despite the presence of undercuts. Walls BDS, PhD, FDSRCS <>>> The most significant work in this area since 1966 is reviewed below. Current Impression Materials Rei~bick1 stated either high or low viscosity materials produced the same degree of accuracy and stability. One brand from each chemical group was selected to allow relative ranking of … Unformatted text preview: SUMMARY OF WHAT WE NEED TO KNOW (below tis you will find all notes from the lecture) What you need to know endobj x��=�rG���?�#0!4���n�C���C��-[�٘��B$F A mm��of���2�3!��#3++�j�������}������,�V�۳7�����t�:{�\�o��z{s�����~X5�ݓ'���ϲ�o����;�1�2{���XV��Y�d�k��*{s }������_�%}������,��3{���_}��CY�e���%�`���yQ�l�������e���CU�U��˗2��8vf*�������Z�s��_����2���>�JTzЖ�5��_�~%$�==_�Y�㼞m�v7�&�36۾Ϟ�nkh�v��1˚���]d?�Y1��|�}�~9�\1�@^�.� ��\���f.g�?O����Z�����۽/r�6�� ��"�;��t�*�%�dxt��y $Y0>���u�x��F~�?�Or�a}���f�8Cr~{_^Ӄ� ��s����35;d?�`�f�3؋�G�s0 W=ص�k�e.�h�*�=ǎ�-C�?F�y�@}�Hc�`YU8[O�K:��'a}V�]��Z�H�@��~ ���1R���������j����i�*}�0������Q �~��j� The working times of impression materials procured at retail in alginate paste were shorter than those of alginate Impression materials in powder. endobj Dentistry and Dental Materials, 2. Of these, addition silicone and polyether are … 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. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 15 0 R] /MediaBox[ 0 0 595.32 841.92] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> %���� Applied Dental Materials Ninth Edition John F. McCabe BSc, PhD, DSc Professor of Dental Materials Science Newcastle University Angus W.G. Full Document, University of the East, Manila • ENGLISH 20. • • he said this in lecture but I don’t understand so I emailed him types of elastomeric impresion material o polysulfide, silicone, polyether, polyvinyl siloxane o these types all polymerize why remove impression quickly from mouth? Download PDF View details Digital workflow for the design and additively manufacture of a splinted framework and custom tray for the impression of multiple implants: A dental technique 2018, Journal of Prosthetic Dentistry Of particular interest has been the effect of disinfection solutions on the qualities of impressions and the biocompatibility of impression materials. Elastic impression materials are used more extensively than rigid materials, because elastic materials flex from tissue undercuts when removed from the mouth, whereas rigid materials cannot. § May have to cut out the impression with polyvinyl siloxane § PE and PVS (A-­‐S) is very stif o Lowe elastic modulus and high tear strength good sometimes with polysulfide Complex stressed during impression o Material sticks to tooth à dimensional changes possible Modeling viscoelastic behavior o Can model this with springs and dash pots o Measure stretch and recovery Viscoelastic behavior medles o Can only pull the shock absorber at a certain rate Parallel elements o Dsashpot = a shock absorber o In parallel spring pulls on dashpot but it takes longer Model combinations in compression ~ real world o Once it changes dimension doesn’t want to come back o Everything else recovered elastically o There is an amount of permanent deformation Creep = visoelastic flow eprmanent set o Viscoelastic à you ckeep the load on à get deformation and won’t recover o Don’t want the viscous element to act very long à that’s why you remove it very quickly o Oly come a little bit up the curve on the graph Creep compliance o Spring element with a polyether à if u remove it will ome back o Polysulfide gets the most change o These materials much better with elastic behavior Comparitive physical prperieis o Very low values are good o Measure by putting the weight on à does it recover à how much Tear strenth improtant o Don’t want a tear down in the sulcus that you don’t see and don’t remove o Repsonse to these materials over a few days is equisite o Check in the mouth and check impression Cell response o Look at cell viability o Polyether is the worst – nice properties but don’t leave it in the sulcus o Tremendous inflamation and bone loss may result o PS rubber not bad at all < alginate < ZOE paste < PE (worst) Tear strength testing Tear strength test o Monitor how much force it takes etc. The plaster should be mixed with water or an anti-expansion solution in the ratio of 100g to 50-60ml. This updated thoroughly revised and revamped edition would serve the students, teachers and professionals associated with clinical dentistry. crowns and for bridges? In this video, we talk about various impression materials including agar, alginate, polysulfide, condensation silicone, polyether, and PVS. ELASTIC Impression MATERIALS ABHISHEK KAVLEKAR 3. 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. The mix should be a smooth paste, free of air bubbles, which may appear on the surface of the impression leading to inaccuracy. It is aimed primarily at undergraduate dental students, although it will also be useful for practising dentists, dental technicians and dental assistants. The operating principle involves the application of a fixed compressive strain and the resulting stress is measured. There are four kinds of Elastomers used as impression materials viz., polysulfide, condensation silicone, addition silicone and polyether. • • o Don’t want bubbles in the dies § And also when you put matterial on stone § so die stone will wet into it and you won’t have bubbles in dies o Want good wettability with tissue and with water o Need modifications to achieve this Relative wettability of polymeric impression materials o Polyvinyl siloxane: High contact angle with water à need to modify à lower contact angle so it can compete with polyether o PE better > than PVS (AS) o AS used to be hydrophobic (high contact angle) o PE > hydrophilic AS (modified) > PS > hydrophobic AS > CS (condensation silicone) Contact angles on moiste dentin… o Want to lower Preparation pretreatments o Want to we the tooth structure o Can add a surfactant to wet the tooth structure Change with surfacting applicatoin o Light body material on the tooth o B4 materal helps it slide down the tooth surface o Get more detail by using this B4 stuff – more wetability – lower contact angle Recommending disinfection techniques o Don’t want to swell the impression material o Don’t apply more than 10-­‐ minutes or else get swelling o Polyether à use chorline type compounds / iodifores o Gluteraldehydes can’t be used with polyether Web based impression update o Can find this overview Digital impression – multiple slides o Lab builds the dye to replicate what you’ve captured o Lava system is good – oral system from MIT § 20 scans perminute à comes up with a dye § then can get the CAD CAM o cadent itero § lets you know if you have clearance o used to have to put powder on teeth to give computer an opque surface but now u don’t need that § ciraq used to need that and some still do mouthguard elastomers o ethyl vinyl acetate o need 3mm thick for sports o heat process – drape over a die o 4mm à heat à become 3mm o impact force à energy to distort material à tooth protected bc displacement is limited o can use impact tester with a weight that drops down o 2010 study comparing the air / water / artificial saliva systems § polyshock sets the standard for these materials § it’s a combo of the eva and proform ...View After the preparation, they are placed inside impression trays. 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 oxide-eugenol, and agar and alginate. 3 0 obj The elastic impression materials are most generally used for the making of impressions for removable partial dentures, immediate dentures, and crowns • • • • • • o Many components o Take a polymer à cross link it à make it elastic o Problem is that polymerization leads to shrinkage à solution? Does high viscoelasticity mean stiff? The impression taken should be highly precise, thus, requiring specific care when manipulatingthese 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. 19.1 Bondoc2 measured the percent per-manent deformation and strain in compres- sion for silicone-based materials according to American Dental Association Specification no. Elastic Impression Materials: Hydrocolloids 18.1 Introduction. 1. Why is the elastic modulus of the set impression material important 0.1% shrinkage o 0.1% x 8000 microns for 1 tooth à 8 microns à 4 microns on mesial or distal o There is adhesive on the tray and also mechanical retention – shrinks in that direction o So dies are oversized usually o Short on occlusal ? In hydrocolloid, polysulfide or silicone, the molar crown preparation was the most sensitive to dif- ferences between the materials. This updated thoroughly revised and revamped edition would serve the students, teachers and professionals associated with clinical dentistry. Elastic impression materials The base and catalyst are either 2 paste substances or a powder and a liquid (which may be water). Elastic impression compositions Download PDF Info Publication number US2359512A. Plus, the material’s excellent dimensional stability and elastic recovery ensures the impression arrives at the lab in the same condition it left your patient’s mouth. impression material is non elastic when set and so will not record under cuts accurately.9 Another limitation of impression compound is that it can only be used with non perforated stock trays which are not easily available nowadays and also the operator may burn the soft tissue of the patient inadvertently during its manipulation. All “elastic impression materials” have the same gener al type of formulation. They all have a flexible matrix (the continuous phase) that is filled with extender or filler (the dispersed phase) to minimize the effects of polymerization shrinkage during setting on the overall accuracy and dimensional stability of the system. Be easy to use with minimum equipments. 2 0 obj Why impression material should be removed quickly from the mouth? Compound impression can be added or corrected. Elastic impression compositions Download PDF Info Publication number US2359512A. o (fast/short set time > slow): Addition silicone (PVS) > polyether > condensation silicone > polysulfide rubber Working time problems o In lab it takes for ever to set o But in the mouth it all happens faster o May have various layers where they don’t mix / steps Impression concerns o Make sure all the materials get to the mouth and there is no delay o Don’t want material in the tray to start setting without u knowning o May be elastic and may still also be flowing o We may be compressing it but it may recover once you remove it o Set in elastic state à Remove tray à impression rebounds à Might have a short and distorted die o Lab, not a problem, mouth is a problem o Want material freshly mixed and “dead soft” Impression materials o All has to do with rxn conversion o At 50% conversion à they all get rubbery o With PE and PVS very much in a hurry o They all set at different rates factors affection impression / dimensional stability / accuracy o polymerization shrinkage is immediate but … § there is a potential for longterm shrinkage with biproduct o when u remove it gets distored à will it recover elastically? • • • • What does 0.1% shrinkage mean clinically? Elastic materials have a soft consistency but after setting, they become elastic. Generally, they can be easily stretched and rapidly recover their original dimensions when … Elastic Impression Materials - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Alginate, Jeltrate (regular), Xantalgin (normal) and Zelgan had long working time. Elastomeric Impression Materials Elastomers comprise a group of synthetic polymer-based impression materials that are chemically cross-linked when set and that can be stretched and yet rapidly recover to their original dimensions, like vulcanized natural rubber when the applied stress is released. Juniordentist.com is intended for educational, informative and entertainment purposes only. Alginates are the most used impression materials in all dental practices. Basic Dental Materials by Manappallil PDF, ePub eBook D0wnl0ad Serves as a keystone to the understanding of Basic Dental Materials in general and their application to clinical dentistry in particular. ! 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 oxide-eugenol, and agar and alginate. Elastic impression materials include reversible (agar-agar), irreversible (alginate) hydrocolloids and synthetic elastomers (polysulfides, polyethers, silicones). 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.. o Shorter OG à crown short à open margins especially buccally o Wider BL / MD à crown over extended • • • • • US2359512A US479446A US47944643A US2359512A US 2359512 A US2359512 A US 2359512A US 479446 A US479446 A US 479446A US 47944643 A US47944643 A US 47944643A US 2359512 A US2359512 A US 2359512A Authority US United States Prior art keywords alginate impression water soluble insoluble … percolation The pumping of oral fluids in and out at the tooth-restoration interface as the restoration contracts and expands with temperature changes. 9.1 Failure of Elastic Materials In terms of material behavior, failure means a change in the normal constitutive behavior of a material, usually in response to excessive loads or deformations that cause irreparable changes to the microstructure. 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This textbook covers all aspects of materials science relevant to the practice of dentistry accurately reproducing both hard. Various impression materials in all dental practices better understanding of their mechanical properties of polysulfide, silicone polyvinyl. Revamped edition would serve the students, although it will also be useful for dentists. And their accuracy is pretty good of theteeth and surrounding tissues by any college or University upon removal from impression... Materials to be used in dentistry are based on the technic of handling alginate hydrocolloids distortion the. And PVS oral & dental Journal ol 35, no to separate cast from the impression to!

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