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# Magnets in orthodontics /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078

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### Magnets in orthodontics /certified fixed orthodontic courses by Indian dental academy

1. 1. MAGNETS IN ORTHODONTICS www.indiandentalacademy.com
3. 3.  Introduction  Types of magnetic materials  Properties of magnets  Application of magnets in orthodontics. www.indiandentalacademy.com
4. 4.  In 1953, magnets were first used for denture retention by BEHRAN & EGAN.  Use of magnets in orthodontic- BLECHMAN & SMILEY. www.indiandentalacademy.com
5. 5. PROPERTIES OF MAGNETS  Flux Density www.indiandentalacademy.com
6. 6.  In dentistry, ferromagnetic materials with static field are used.  Magnetocrystalline Anisotropy.  Coercivity. www.indiandentalacademy.com
7. 7.  Coulombs law:-This law states that force between two magnetic poles is directly proportional to magnitude & inversely proportional to square of the distance between them.  Curie point:-Pierre Curie(1859-1906) www.indiandentalacademy.com
8. 8.  High force to volume ratio.  Maximal force at shorter distances. www.indiandentalacademy.com
9. 9.  No interruption of magnetic force lines by intermediate media.  No friction in attractive force configuration.  No energy loss. www.indiandentalacademy.com
10. 10. TYPES OF MAGNETIC MATERIALS       Platinum-cobalt(Pt-co) Aluminium-Nickel-Cobalt(Al-Ni-Co) Ferrite Chromium-cobalt-Iron Samarium Cobalt(SmCo) Neodymium-Iron-Boron(Nd2Fe B) 14 www.indiandentalacademy.com
11. 11.  SAMARIUM-COBALT (SmCo5&Sm2Co17) MAGNETS:- -high resistance to demagnetization. -corrosion resistance. www.indiandentalacademy.com
12. 12.  Advantages:-Continuous force is exerted. - Eliminates the patient co-operation. -No friction.  Disadvantages:-Tarnish &corrosion products are cytotoxic. -Cost factor www.indiandentalacademy.com
13. 13.  Biological effect of magnetic forces:- Aronson:-thinning of epithelium under attracting & repelling magnets. McDonald - proliferative activity of fibroblasts in presence of static magnetic field Lars Bondemark & Kurol studied changes in human dental pulp and gingival tissue. www.indiandentalacademy.com
14. 14. APPLICATIONS OF MAGNETIC APPLIANCES 1. 2. 3. 4. 5. 6. Tooth intrusion Expansion Tooth Impaction Space closure Molar distalization Magnetic Edgewise brackets 7. 8. Functional Appliances. Retainers. www.indiandentalacademy.com
15. 15.  Tooth Intrusion:Active Vertical Corrector-Dellinger(1986) -Samarium cobalt magnets in the repelling mode are used. www.indiandentalacademy.com
16. 16.  Fixed Magnetic Appliance:-introduced by VARUN KALRA & CHARLES BURSTONE. Appliance consists of an upper &lower acrylic splints with samarium cobalt magnets in stainless steel casting embedded in a repelling mode. www.indiandentalacademy.com
17. 17.  EXPANSION:-Vardimon et al(1987) demonstrated palatal expansion using two types of magnetic devices in Macaca fascicularis monkeys. -Tooth borne appliance www.indiandentalacademy.com
18. 18.  Tissue borne appliance (attached directly to palate by endosseous pins). www.indiandentalacademy.com
19. 19.  Tooth Impaction:- Vardimon,Graber,Drescher -Neodymium Iron Boron magnets can be used to assist eruption of an impacted canine.  Mancini(1996)-force levels are sufficient enough to induce the cellular &biochemical changes are required to produce orthodontic tooth movement. www.indiandentalacademy.com
20. 20. space closure -simple tooth movement without archwires :-Muller(1984) -Complex Intra &Interarch Mechanics:-Blechman(1985) CL-II mechanics with a magnetic force system in a CL-I extraction case www.indiandentalacademy.com
21. 21. 3 magnet configuration to enhance CL-II mechanics 3 magnet configuration used to simultaneously move all 4 canines distally www.indiandentalacademy.com
22. 22. CL-II mechanics using magnetic force system in CL-II extraction case. Repulsive CL-II mechanics in CL-II Nonextraction cases. www.indiandentalacademy.com
23. 23.  Molar Distalization. -Gianelly et al(1989):-repelling magnets in conjuntion with a modified Nance appliance was used. -Bondemark & Kurol:-repelling samarium cobalt magnets were used for distalization. www.indiandentalacademy.com
24. 24.  Magnetic Edgewise Brackets:-Kawata(1987) -Samarium cobalt magnet with an edgewise bracket (o.018slot) . www.indiandentalacademy.com
25. 25.  Functional Orthopaedic Magnetic Appliances:Vardimon(1989) -for correction of CL-II&CL-III malocclusion. www.indiandentalacademy.com
29. 29.  Magnetic Twin Block:Clark(1996) -Samarium cobalt magnets were embedded in the inclined surface of the twin block in attractive mode. www.indiandentalacademy.com
30. 30.  Magnetic Activator Device(MAD):-Darendilier (1993) developed this magnetically active functional appliance. MAD I-mandibular deviations MAD II-CLII malocclusion MADIII-CLIII malocclusion MADIV-skeletal open bite correction. MAD-II www.indiandentalacademy.com
31. 31. MAD-II FOR CORRECTION OF CL-II,DIVISION 1 MALOCCLUSION. Deep Bite open Bite www.indiandentalacademy.com