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2. SPRINGS
• Springs are a part of the active
components of removable orthodontic
appliances used to bring about tooth
movement.
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3. • To bring about tooth movement, always
use light and continuous forces
• Heavy forces damage the periodontium,
bring about root resorption etc.
• LOW AND STEADY WINS THE RACE
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4. CLASSIFICATION
• Acc. to C P Adams
Self supporting springs
Protected and guided springs
• Acc. to Houston & Isaacson
Buccal spring
Palatal spring
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5. • Acc. to S J Chaconas
Labial wire spring
Free ended spring
Accessory spring
• Acc. to Graber and Neuman
• Closed or continuous loop spring
• Free ended spring
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6. REQUIREMENTS OF A SPRING
•
•
•
•
Simple to fabricate
Easily adjustable
No discomfort to the patient
Be easily kept clean
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7. REQUIREMENTS OF A SPRING
•
•
•
•
•
Apply forces of required magnitude
Apply forces in required direction
Be robust
Be stable (i.e. not slip)
Should move the tooth through the
required distance
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13. Factors to be considered when
designing a spring
• Force to be applied
• Direction and type of tooth movement
• Stability of the spring
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27. Stability
Stability of a spring can be improved by
• Guarding with a wire
• Protecting the spring with acrylic
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28. REQUIREMENTS OF A SPRING
•
•
•
•
•
Apply forces of required magnitude
Apply forces in required direction
Be robust
Be stable (i.e. not slip)
Should move the tooth through the
required distance
www.indiandentalacademy.com
36. REQUIREMENTS OF A SPRING
•
•
•
•
•
Apply forces of required magnitude
Apply forces in required direction
Be robust
Be stable (i.e. not slip)
Should move the tooth through the
required distance
www.indiandentalacademy.com