angolÍvbiomech20071121másolható.pdf
TRANSCRIPT
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THE PROPERTIES OF THE THE PROPERTIES OF THE ORTHODONTIC ARCHESORTHODONTIC ARCHES
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OUTLINEOUTLINE FlexibilityCross sectionLengthMaterial properties FrictionImportance of the ligaturesMaterial propertiesCross section importance
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Stiffness and the cross-sectional Stiffness and the cross-sectional dimensiondimension
of the wiresof the wires The form of cross
section The variation of cross
section size
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Stiffness and the lengthStiffness and the lengthof the wiresof the wires
The connection between the length of the wire and the inter bracket distance
loop
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The possibility of the enlarge of The possibility of the enlarge of the lengththe length of wiresof wires
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Loop systems
Upper retractor Lower retractor Delta loop
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Utility and the sectional arch
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Stiffness and the materialStiffness and the materialof the wiresof the wires
Gold alloy Iron alloy Titan alloy
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Three-point bending test
L=10mm Bending 5mm
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Gold alloy
Nowadays uses only as a coat material
A TMA wires stiffness similar with the gold arches
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Iron alloy
Iron with Chrome-nickel Iron with Cobalt-chrome-nickel
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Cobalt-Chrome-nickel-ironElgiloy
Material: Cobalt(40%) Chrome(20%) Nickel(0,15%), Molibden(7%),
Manganese(2%), Beryllium(0,04%) Carbon(15%), Iron(15,81%)
Annealing
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Titan alloy
in the martensitic form stabilised titan alloy
in the austenitic form stabilised titan alloy
Super elastic alloycu NiTi
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Austenitic form stabilised titan alloy
titan molybdenum wire
TMA arch (beta-titanium)
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In the martensitic form stabilised titan alloy
titan- nickel- cobalt Nitinol or M niti
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Super elastic alloyA-NiTi
1985 Chinese NiTi 1986 Japanese NiTi Sentalloy Fujio Miura 1988 DREHT method
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Nivelliation with super NiTi- wire
10 mm10 mm
10 mm10 mm
16x22 superelastic 118cN
(16x22 iron 1360cN)
16x22 superelastic 63cN(16x22 iron 730cN)
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Super-NiTi arch, force-deflection diagram
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Super elastic arches force-deflection curves
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The DREHT method arches properties
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The influence of the frictionThe influence of the friction Ligation Diameter of the arch Material of the arch Surface of the
elements System without
friction
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The ligation forms
Traditional ligature wire Elastic ligatures different
forms
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Special brackets for ligation
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Newest techniques in the ligation
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