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2. INDIAN DENTAL ACADEMY
Leader in continuing dental education
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3. Introduction
Types of magnetic materials
Properties of magnets
Application of magnets in orthodontics.
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4. In 1953, magnets were first used for denture
retention by BEHRAN & EGAN.
Use of magnets in orthodontic- BLECHMAN &
SMILEY.
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6. In dentistry, ferromagnetic materials with
static field are used.
Magnetocrystalline Anisotropy.
Coercivity.
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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)
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8. High force to volume ratio.
Maximal force at shorter distances.
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9. No interruption of magnetic
force lines by intermediate
media.
No friction in attractive force
configuration.
No energy loss.
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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)
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12. Advantages:-Continuous force is exerted.
- Eliminates the patient co-operation.
-No friction.
Disadvantages:-Tarnish &corrosion products are cytotoxic.
-Cost factor
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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.
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15. Tooth Intrusion:Active Vertical Corrector-Dellinger(1986)
-Samarium cobalt magnets in the repelling mode
are used.
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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.
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17.
EXPANSION:-Vardimon et al(1987) demonstrated
palatal expansion using two types of magnetic devices in
Macaca fascicularis monkeys.
-Tooth borne appliance
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18. Tissue borne appliance (attached directly to
palate by endosseous pins).
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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.
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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
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21. 3 magnet configuration to enhance
CL-II mechanics
3 magnet configuration
used to simultaneously
move all 4 canines distally
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22. CL-II mechanics using magnetic force
system in CL-II extraction case.
Repulsive CL-II mechanics in CL-II
Nonextraction cases.
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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.
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24. Magnetic Edgewise Brackets:-Kawata(1987)
-Samarium cobalt magnet with an edgewise bracket
(o.018slot) .
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25. Functional Orthopaedic Magnetic Appliances:Vardimon(1989)
-for correction of CL-II&CL-III malocclusion.
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29. Magnetic Twin Block:Clark(1996)
-Samarium cobalt magnets
were embedded in the
inclined surface of the
twin block in attractive
mode.
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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
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31. MAD-II FOR CORRECTION OF CL-II,DIVISION 1
MALOCCLUSION.
Deep Bite
open Bite
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39. Propellant Unilateral Magnetic Appliance (PUMA)
- Chate(1995)
Magnets are use to stimulate costo-chondral bone
graft in Hemi facial microsomia.
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