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29 Cards in this Set
- Front
- Back
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What orthodontic device is used for simple attachment?
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A button or hook
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What orthodontic device is normally used to apply forces and couples?
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A bracket
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What is another name for rectangular brackets?
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Edgewise
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What does the slope of a Stress-Strain or Load-Deflection Curve represent?
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Modulus of Elasticity, or Stiffness
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What does a higher slope of a stress-strain curve represent?
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Increased Stiffness
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What does a lower slope of a stress-strain curve represent?
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Increased Springiness
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What is the max force that a wire can deliver before deforming or breaking?
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Strength
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What is the maximum deflection a wire can undergo before deforming or breaking?
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Range
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What happens to the stiffness of the wire if the diameter is doubled?
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It becomes 16 times stiffer (Change in Diameter to the Fourth Power)
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What happens to the springiness of the wire if you double the length?
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It makes it 8 times springier (Increase in length, Increase in springiness to the third power)
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What type of anchorage is involved when two equal teeth or sets of teeth move equally in the same direction?
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Reciprocal Anchorage
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What is the "Anchorage Value" roughly equal to?
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Root surface area
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How can you accomplish reinforced anchorage?
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Add more teeth to increase anchorage on the side you want to move less
Decrease teeth on the side you want to move more. |
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What type of anchorage is accomplished when one side undergoes a hard tooth movement while the other has easy movement?
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Stationary Anchorage
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What does the location of a tooth's center of resistance depend on?
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The shape of the tooth and the periodontal support
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What is the term for a tendency to rotate?
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Moment
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What are two equal and oppositite non-colinear forces called?
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Couple
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What always causes pure rotation around the Center of Resistance?
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Couple
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What order is viewed in the occlusal plane and includes in-out bends, causing bucco-lingual movement, and rotation?
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1st Order
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What order is viewed from the facial or lingual and includes up-down bends, vertical movement, and tipping?
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2nd Order
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What order is viewed from the mesial or distal and includes torquing bends, bucco-lingual rotation called torque?
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3rd Order
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What type of tooth movement would occur when the M/F = undefined?
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Pure Rotation
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What type of tooth movement would occur when the M/F > 13/1?
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Root Movement
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Where is the center of rotation during Root Movement?
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At the Crown
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What type of tooth movement would occur when the M/F = 10/1?
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Pure Translation
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What type of tooth movement would occur when the M/F = 7/1?
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Crown Movement
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During what movement is the center of rotation at infinity?
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Pure Translation
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During what tooth movement is the center of rotation at the root apex?
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Crown Movement
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Where is the center of rotation during a tipping movement?
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On the root apical to Center of Rotation
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