Brittle materials do well under compressive forces, however, because they tend to close cracks. Therefore, the greater the ductility and the lower the yield strength, the greater the burnishabilityPowerPoint Presentation: MALLEABILITY Ability of a material to sustain permanent deformation without rupture under compression as in hammering or rolling into a sheet Gold is the most malleable, second is silver & aluminium third An increase in temperature generally results in a increase in malleability because malleability is dependent upon dislocation movement, and dislocations generally move more easily at a higher temperature.PowerPoint Presentation: Ductility Malleability Gold Gold Silver Silver Platinum Aluminium Iron Copper Nickel Tin Copper Platinum Aluminium Lead Zinc Zinc Tin Iron Lead NickelPowerPoint Presentation: HARDNESS In mineralogy the relative hardness of a substance is based on its ability to resist scratching. Restorative dental materials, Craig 12 th edition Dental Materials & their selection by William J. O’Brein 4 th edition Fundamentals of colour by Stephan.J.Chu Esthetics in dentistry, by Goldstein Esthetic dentistry:An artists science, Sharat reddy and Ratnadep Patil . It primarily centers around static bodiesPowerPoint Presentation: STRESS Stress = Force/ Area SI units: MPa or psiTypes of stresses: Types of stresses Compressive stress compress or shorten Tensile stress stretch or elongatePowerPoint Presentation: Shear stress A stress that tends to resist the sliding or twisting of one portion of a body over another. Thermal Properties III. CeramicKnoop hardness test: Knoop hardness test Rhombohedral pyramid diamond Indentation - Rhombic Length of the largest diagonal is measured.PowerPoint Presentation: Ideal for measurement of elastic materials Advantages : same as the Vickers test. Units : m.MN / m 3 - represents energy per unit volume of materialPowerPoint Presentation: A high modulus of resilience is desirable for orthodontic wires - they are capable of storing energy which may then be delivered over an extended period of time.STRENGTH PROPERTIES: STRENGTH PROPERTIES Strength is the stress that is necessary to cause fracture or a specified amount of plastic deformation.PowerPoint Presentation: PROPORTIONAL LIMIT The proportional limit is defined as the greatest stress that a material will sustain without a deviation from the linear proportionality of stress to strain.PowerPoint Presentation: ELASTIC LIMIT The maximum stress that a material will withstand without permanent deformation.   Flexibility is bending capacity . Density is the mass per unite volume of the material .its units are gm/cm³ and pound/in³. Learn vocabulary, terms, and more with flashcards, games, and other study tools. „{n[8mE™ÃŸŒ@ȁÒBºöAܜìüXjTÛbSý”Õ¶OF@¤ås0¡õî®F\È ÓäΈ–õ®OÅ,,榮‹Ã@"C! to tensile loading ( Uniaxial tension test). Often materials are subject to forces (loads) when they are used. These can be defined as the strain that occurs when the material is stretched to its proportional limit Flexibility with respect to impression material is important Flexibility  Elastic recoveryPowerPoint Presentation: Resilience Defined as the amount of energy absorbed within a unit volume of a structure when it is stressed to its proportional limit. With appropriate values for velocities and masses involved, a blow by fist to jaw can be considered an impact situation.PowerPoint Presentation: A material with low elastic modulus and high tensile strength is more resistant to impact forces. Physical properties include ; 1-density ; 2-thermal properties ; 3-electrical properties ; 4-optical properties; 3 Density. Hence they are brittle.PowerPoint Presentation: Brittle materials are sensitive to internal flaws/cracks/voids and do not respond well to tensile or bending forces because these forces tend to propagate the flaws/cracks/voids. College of Dental Medicine, Ft. Lauderdale, FL 33328-2018 jeffthom@nova.edu We will approach all of the major categories of ceramic properties in this module – physical, chemical, and mechanical – with key examples for each one. Materials Science and Engineering: C, Volume 106, 2020, Article 110167. 3 3. Шœ–Áއ=©wáϊ.¯ß2 ùù$¸À‡Úµê¹sön XHTkÌ°­vJ‰jž! +Ø~äÁã#˜ýpÑØû­ãJ¤^„WÐÒdn)kÚïÆ¡\:!>IÒûÕéš2ûd†ØXšB¤J¢dbÒF€¼w§5$äñ•HƤª ¥ÉÜT¦}8Íùé ­è'1™‹]W”Ù+3ÄÆÒ"U*,CsÄCc8´òîz.RYsz¾É˜\C%´4™›Ê­Œ…ß9Кb÷ڝ§\Sæ‘!6–¦©Ò©™ƒ¢(FW>]§1'“W/ÝÓS•HN­ ¥ÉÜTæsÊ0K¹ðG´¹Vòa—nΓkT9ñŒ@Hzg The following online modules for dental materials instruction are OPEN SOURCE for free use of anyone as long as all appropriate credits are provided during their use to recognize the authors. Correct proportion important. In Craig's Restorative Dental Materials (Fourteenth Edition), 2019. deemah34 Title: Physical properties of dental materials 1 Physical properties of dental materials 2 The elements of study. But if both the values are low, impact resistance is also low. Fatigue - defined as a progressive fracture under repeated loading. Mechanical Properties of Dental Materials Colloidal systems Two or more phases with one highly dispersed on the other. 1øžànp2Î46%ª©­B–sSWÐâ®sD¯áã8t ëžavDZ­,…F¤"r´-Û-À.€™ð~©ÒȐT?%³´˜[º†G*®è>f'pKWD]àí7–¢P¨ÂځLÍÇKâ@÷Ž'm„ Mechanical properties of dental materials By, Dr.S.H.Karthick , II yr PG, Department of Conservative Dentistry & Endodontics PowerPoint Presentation: Mechanical properties Stress Strain Mechanical properties based on elastic deformation Stress-strain diagram Modulus of elasticity Poisson's ratio Flexibility Resilience guide to dental materials and devices including information on the use properties and or characteristics of Nov 11, 2020 Posted By John Creasey Library TEXT ID 8107a3595 Online PDF Ebook Epub Library paffenbarger is director emeritus of the american dental research unit at the national bureau of standards dental materials are used in different treatments such as plaque Copy, By: Toughness depends on strength and ductility. The energy lost by the pendulum during the fracture of the specimen can be determined by the comparison of the length of the swing after the impact with that of its free swing when no impact occurs. Spring loaded needle with a diameter of 1 mm 10% decrease in Barcol hardness of a resin composite results in a 20% decrease in the flexural strength.Shore hardness test: Shore hardness test Measure the hardness of rubbers & soft plastics Values  0 to 100PowerPoint Presentation: Material Compressive Strength ( MPa ) Tensile strength ( MPa ) Modulus of Elasticity ( GPa ) Hardness Cast metal 1140 177 – 202 335 DFG 46 – 50 55 – 69 Amalgam 396 – 423 48 – 64 52 – 58 120 GIC 150 6.6 9 48 Composite 280 – 385 40 – 54 16 – 21 43 – 70 Ceramics 150 24 – 37 70 - 107 591 Enamel 384 10.3 84 - 130 355 – 431 Dentin 297 105.5 14.7 339 – 418Conclusion: Conclusion Single property  Combined propertiesReferences: References Phillip’s science of dental materials 11 th edition. Optical Properties V. Mechanical Properties I. Change in the mechanical, thermal and catalytic properties of the materials can be seen with the increase in surface area to volume ratio at the nanoscale level. Mechanical properties are subset of physical properties that are based on the laws of mechanics that is the physical science that deals with energy and forces and their effects on the bodies. Quickly memorize the terms, phrases and much more. HTTPS (Hypertext Transfer Protocol Secure) is a protocol used by Web servers to transfer and display Web content securely. Dental restorative materials are used to replace tooth structure loss, usually due to dental caries (dental cavities), but also tooth wear and dental trauma.On other occasions, such materials may be used for cosmetic purposes to alter the appearance of an individual's teeth.. Density • The amount of mass of a material in a given volume. Burnishability Index is defined as the percentage elongation divided by the yield strength. You do not have the permission to view this presentation. 5 Most engineering material have values of 0.3 Siméon Denis Poisson (1781-1840)PowerPoint Presentation: Material Poisson’s ratio Amalgam 0.35 Zinc phosphate cement 0.35 Enamel 0.30PowerPoint Presentation: FLEXIBILITY Ability of a material to return to its original form indicates its elasticity, but the strain taking place at elastic limit is known as flexibility. PHYSICAL, THERMAL, AND MECHANICAL PROPERTIES OF POLYMERS A1.1 PHYSICAL PROPERTIES Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on. Eg: .Orthodontic Bracket removalFlexural (bending) stress: Flexural (bending) stressPowerPoint Presentation: Strain Strain = Change in Length / original length Strain (  ) = Deformation / = L – Lo / Lo =  L/ Lo original lengthStrain: Elastic or Plastic: Strain : Elastic or PlasticMECHANICAL PROPERTIES BASED ON ELASTIC DEFORMATION: MECHANICAL PROPERTIES BASED ON ELASTIC DEFORMATION STRESS-STRAIN DIAGRAMPowerPoint Presentation: HOOKE’S LAW (1678)MODULUS OF ELASTICITY : MODULUS OF ELASTICITY Relative rigidity or stiffness of the material within elastic range Young’s modulus of elasticity Elastic modulus = Stress Strain Units : MPa or GPa ( 1 GPa = 1000 MPa )PowerPoint Presentation: Material with a steep line - higher modulus (more rigid).PowerPoint Presentation: Modulus is a reflection of the strength of the inter-atomic or intermolecular bonds. More rigid/stiff the material under compressive forces, however, Because they tend to close cracks restorative materials!, Stephen C. 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