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�ݺ�ߣshows by User: RohitSingh177 / http://www.slideshare.net/images/logo.gif �ݺ�ߣshows by User: RohitSingh177 / Sat, 28 May 2022 04:38:58 GMT �ݺ�ߣShare feed for �ݺ�ߣshows by User: RohitSingh177 Dental casting alloy.ppt /slideshow/dental-casting-alloyppt/251872106 dentalcastingalloy-220528043859-65fdcc16
DENTAL CASTING ALLOYS Mostly metals used in dentistry are in the form of alloys or mixture of one or more metals. Alloy: two or more metal that are mutually soluble in each other in the molten state. Metal: Any strong and relatively ductile substance that provide electropositive ions to a corrosive environment and that can be polished to a high luster. Uses of metal or alloys in dentistry:  For direct intra-coronal restoration such as using direct filling gold.  Fabrication of extra-coronal restoration such as inlays, onlays, crown and fixed partial denture.  For fabricating superstructure, cast frameworks, cast partial denture etc.  For surgical use such as making titanium plates, screws etc.  For orthodontic use in making wires, brackets, bands etc.  For making laboratory instruments etc. Properties of metal:  Should have high strength.  Should be malleable and ductile.  Should have good thermal and electrical conductivity.  Should have high luster.  Should have high corrosion resistance . Structure of metal: All metals are crystalline in nature.it refers to regular arrangement of atoms. There are six different type of crystal structure: a) Cubic - Simple - Body-centered - Face conferred b) Tetragonal - Simple - Body-centered - Rhombohedric c) Orthorhombic - Simple - Body-centered - Face-centered - Base centered d) Monoclinic - Simple - Base centered e) Triclinic f) Hexagonal Crystal lattice structure Classification of dental casting alloys On the basis of use  alloys for all metal and resin veneer restorations  alloys for metal ceramic restoration  alloys for post and core  alloys for removable partial denture  alloys for dental implants on the basis of major elements  gold based alloys  palladium based  silver based  nickel based  cobalt based  titanium based on the basis of three major elements  gold-palladium-silver  palladium-silver-tin  nickel-chromium-molybdenum  cobalt-chromium-molybdenum  iron-nickel-chromium  titanium-aluminum-vanadium on the basis of nobility o high noble metal alloy o noble metal alloy o Predominantly base metal alloy o Base metal alloy On the basis of dominant phase system  Single phase or solid solution alloys  Eutectic alloys  Peritectic alloys  Intermetallic compound Alloys for all metal restoration Earlier days metal restoration was choice for replacement of missing teeth, but as an advancement of new material and because of color of metal, the uses of metallic restoration have reduced. However, the metal alloys continue to be used in metal-ceramic restoration to enhance strength, wear resistance and hardness. Classification: Based on their yield strength, percentage elongation and use, alloys for all metal restorations are classified into  Type I soft Small inlays, class III and class IV cavities which are not subjected to wear great stress.  Type II medium For inlay, onlays and partial veneer crown, abutm]]>
DENTAL CASTING ALLOYS Mostly metals used in dentistry are in the form of alloys or mixture of one or more metals. Alloy: two or more metal that are mutually soluble in each other in the molten state. Metal: Any strong and relatively ductile substance that provide electropositive ions to a corrosive environment and that can be polished to a high luster. Uses of metal or alloys in dentistry:  For direct intra-coronal restoration such as using direct filling gold.  Fabrication of extra-coronal restoration such as inlays, onlays, crown and fixed partial denture.  For fabricating superstructure, cast frameworks, cast partial denture etc.  For surgical use such as making titanium plates, screws etc.  For orthodontic use in making wires, brackets, bands etc.  For making laboratory instruments etc. Properties of metal:  Should have high strength.  Should be malleable and ductile.  Should have good thermal and electrical conductivity.  Should have high luster.  Should have high corrosion resistance . Structure of metal: All metals are crystalline in nature.it refers to regular arrangement of atoms. There are six different type of crystal structure: a) Cubic - Simple - Body-centered - Face conferred b) Tetragonal - Simple - Body-centered - Rhombohedric c) Orthorhombic - Simple - Body-centered - Face-centered - Base centered d) Monoclinic - Simple - Base centered e) Triclinic f) Hexagonal Crystal lattice structure Classification of dental casting alloys On the basis of use  alloys for all metal and resin veneer restorations  alloys for metal ceramic restoration  alloys for post and core  alloys for removable partial denture  alloys for dental implants on the basis of major elements  gold based alloys  palladium based  silver based  nickel based  cobalt based  titanium based on the basis of three major elements  gold-palladium-silver  palladium-silver-tin  nickel-chromium-molybdenum  cobalt-chromium-molybdenum  iron-nickel-chromium  titanium-aluminum-vanadium on the basis of nobility o high noble metal alloy o noble metal alloy o Predominantly base metal alloy o Base metal alloy On the basis of dominant phase system  Single phase or solid solution alloys  Eutectic alloys  Peritectic alloys  Intermetallic compound Alloys for all metal restoration Earlier days metal restoration was choice for replacement of missing teeth, but as an advancement of new material and because of color of metal, the uses of metallic restoration have reduced. However, the metal alloys continue to be used in metal-ceramic restoration to enhance strength, wear resistance and hardness. Classification: Based on their yield strength, percentage elongation and use, alloys for all metal restorations are classified into  Type I soft Small inlays, class III and class IV cavities which are not subjected to wear great stress.  Type II medium For inlay, onlays and partial veneer crown, abutm]]> Sat, 28 May 2022 04:38:58 GMT /slideshow/dental-casting-alloyppt/251872106 RohitSingh177@slideshare.net(RohitSingh177) Dental casting alloy.ppt RohitSingh177 DENTAL CASTING ALLOYS Mostly metals used in dentistry are in the form of alloys or mixture of one or more metals. Alloy: two or more metal that are mutually soluble in each other in the molten state. Metal: Any strong and relatively ductile substance that provide electropositive ions to a corrosive environment and that can be polished to a high luster. Uses of metal or alloys in dentistry:  For direct intra-coronal restoration such as using direct filling gold.  Fabrication of extra-coronal restoration such as inlays, onlays, crown and fixed partial denture.  For fabricating superstructure, cast frameworks, cast partial denture etc.  For surgical use such as making titanium plates, screws etc.  For orthodontic use in making wires, brackets, bands etc.  For making laboratory instruments etc. Properties of metal:  Should have high strength.  Should be malleable and ductile.  Should have good thermal and electrical conductivity.  Should have high luster.  Should have high corrosion resistance . Structure of metal: All metals are crystalline in nature.it refers to regular arrangement of atoms. There are six different type of crystal structure: a) Cubic - Simple - Body-centered - Face conferred b) Tetragonal - Simple - Body-centered - Rhombohedric c) Orthorhombic - Simple - Body-centered - Face-centered - Base centered d) Monoclinic - Simple - Base centered e) Triclinic f) Hexagonal Crystal lattice structure Classification of dental casting alloys On the basis of use  alloys for all metal and resin veneer restorations  alloys for metal ceramic restoration  alloys for post and core  alloys for removable partial denture  alloys for dental implants on the basis of major elements  gold based alloys  palladium based  silver based  nickel based  cobalt based  titanium based on the basis of three major elements  gold-palladium-silver  palladium-silver-tin  nickel-chromium-molybdenum  cobalt-chromium-molybdenum  iron-nickel-chromium  titanium-aluminum-vanadium on the basis of nobility o high noble metal alloy o noble metal alloy o Predominantly base metal alloy o Base metal alloy On the basis of dominant phase system  Single phase or solid solution alloys  Eutectic alloys  Peritectic alloys  Intermetallic compound Alloys for all metal restoration Earlier days metal restoration was choice for replacement of missing teeth, but as an advancement of new material and because of color of metal, the uses of metallic restoration have reduced. However, the metal alloys continue to be used in metal-ceramic restoration to enhance strength, wear resistance and hardness. Classification: Based on their yield strength, percentage elongation and use, alloys for all metal restorations are classified into  Type I soft Small inlays, class III and class IV cavities which are not subjected to wear great stress.  Type II medium For inlay, onlays and partial veneer crown, abutm <img style="border:1px solid #C3E6D8;float:right;" alt="" src="https://cdn.slidesharecdn.com/ss_thumbnails/dentalcastingalloy-220528043859-65fdcc16-thumbnail.jpg?width=120&height=120&fit=bounds" /><br> DENTAL CASTING ALLOYS Mostly metals used in dentistry are in the form of alloys or mixture of one or more metals. Alloy: two or more metal that are mutually soluble in each other in the molten state. Metal: Any strong and relatively ductile substance that provide electropositive ions to a corrosive environment and that can be polished to a high luster. Uses of metal or alloys in dentistry:  For direct intra-coronal restoration such as using direct filling gold.  Fabrication of extra-coronal restoration such as inlays, onlays, crown and fixed partial denture.  For fabricating superstructure, cast frameworks, cast partial denture etc.  For surgical use such as making titanium plates, screws etc.  For orthodontic use in making wires, brackets, bands etc.  For making laboratory instruments etc. Properties of metal:  Should have high strength.  Should be malleable and ductile.  Should have good thermal and electrical conductivity.  Should have high luster.  Should have high corrosion resistance . Structure of metal: All metals are crystalline in nature.it refers to regular arrangement of atoms. There are six different type of crystal structure: a) Cubic - Simple - Body-centered - Face conferred b) Tetragonal - Simple - Body-centered - Rhombohedric c) Orthorhombic - Simple - Body-centered - Face-centered - Base centered d) Monoclinic - Simple - Base centered e) Triclinic f) Hexagonal Crystal lattice structure Classification of dental casting alloys On the basis of use  alloys for all metal and resin veneer restorations  alloys for metal ceramic restoration  alloys for post and core  alloys for removable partial denture  alloys for dental implants on the basis of major elements  gold based alloys  palladium based  silver based  nickel based  cobalt based  titanium based on the basis of three major elements  gold-palladium-silver  palladium-silver-tin  nickel-chromium-molybdenum  cobalt-chromium-molybdenum  iron-nickel-chromium  titanium-aluminum-vanadium on the basis of nobility o high noble metal alloy o noble metal alloy o Predominantly base metal alloy o Base metal alloy On the basis of dominant phase system  Single phase or solid solution alloys  Eutectic alloys  Peritectic alloys  Intermetallic compound Alloys for all metal restoration Earlier days metal restoration was choice for replacement of missing teeth, but as an advancement of new material and because of color of metal, the uses of metallic restoration have reduced. However, the metal alloys continue to be used in metal-ceramic restoration to enhance strength, wear resistance and hardness. Classification: Based on their yield strength, percentage elongation and use, alloys for all metal restorations are classified into  Type I soft Small inlays, class III and class IV cavities which are not subjected to wear great stress.  Type II medium For inlay, onlays and partial veneer crown, abutm

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