INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com
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CANINE RETRACTORS
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- RAJ K GADDAM
IDEAL OCCLUSION
VS
MAL OCCLUSION
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Malocclusion is a developmental problem resulting from the interplay of several factors that often cannot be isolated www.indiandentalacademy.com
HABITS
MOUTH BREATHING
TONGUE THRUSTING THUMB SUCKING
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DIFFERENT ETIOLOGY OF MALOCCLUSION
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SKELETAL MAL OCCLUSION
DENTAL MALOCCLUSION www.indiandentalacademy.com
SRUCTURAL BALANCE
ESTHETIC HARMONY
FUNCTIONAL EFFICIENCY
JACKSON’S ORTHODONTITIC TRIA www.indiandentalacademy.com
ORTHODONTIC APPLIANCES FIXED
REMOVABLE FUNCTIONAL
ACTIVE PLATE BASE PLATE RETENTIVE COMPONENT
CLASPS ACTIVE COMPONENET SPRINGS BOWS www.indiandentalacademy.com
• CANINE RETRACTORS ARE A TYPE OF ACTIVE COMPONENETS OF REMOVABLE APPLIANCE USED FOR RETRACTION OF CANINES FROM THEIR MALPOSED POSITION TO A PROPER ANATOMICAL POSITION.
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PARTS OF CANINE RETRACTORS RETENTIVE ARM COIL ACTIVE ARM
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ACTIVE ARM PREFERRED TOWARDS THE TISSUE BUCCOLINGUALLY AND IN UNDERCUTS OCCLUSOGINGIVALLY
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POINT OF CONTACT OF ACTIVE ARM ON TO THE TOOTH.
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COIL • DIAMETER. • POSTION OF THE COIL. • ACTIVATION OF SPRING BY OPENING OR CLOSURE OF COIL.
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POSITION OF COIL
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ACTIVATION OF THE SPRING
OPENING OF COIL
CLOSING OF COIL
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ACTIVATION (2-3 mm)
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MECHANICAL PROPERTIES MECHANICAL PROPERTIES
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LOAD DEFLECTION CURVE
B
STRESS OR LOAD
C
A
PROPORTIONAL LIMIT
B
YIELD POINT
C
FAILURE POINT
E
ELASTIC MODULOUS
A
E
STRAIN / DEFLECTION www.indiandentalacademy.com
SPRINGINESS
B STRESS OR LOAD
C
A E α STIFFNESS E α 1/SPRINGINESS E
STRAIN / DEFLECTION www.indiandentalacademy.com
RESILIANCE AND FORMABILITY
B STRESS OR LOAD
A R E S IL I A N C E
C F O R M A B I L I T Y
STRAIN / DEFLECTION www.indiandentalacademy.com
RANGE
B
C
A
STRESS OR LOAD
RANGE STRAIN / DEFLECTION www.indiandentalacademy.com
MECHANICAL REQUIREMENTS • • • • •
SHOULD BE STRONG SHOULD BE SPRINGY SHOULD HAVE HIGH FORMABILITY SHOULD HAVE HIGH RESILIENCE SHOULD HAVE HIGH RANGE
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BI O M E C H A NI C S
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FORCE FÎą D 3 L
4
F: Force(40 gm) D: Diameter of wire(0.7mm) L: Length of wire www.indiandentalacademy.com
TOOTH MOVEMENT (DETERMINED BY DIRECTION OF FORCE)
• BODILY MOVEMENT(FIXED) • TIPPING MOVEMENT(REMOVABLE)
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BODILY MOVEMENT
TIPPING MOVEMENT
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BODILY MOVEMENT
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UNCONTROLLED TIPPING
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CONTROLLED TIPPING
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STABILITY
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HOW TO IMPROVE STABILITY? GUARDING
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BOXING - IN
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BOXING - IN
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BIOMECHANICAL REQUIREMENTS • APPLY LOW AND CONTINUOUS FORCES • APPLICATION IN PROPER DIRECTION • BE STABLE www.indiandentalacademy.com
CLASSIFICATON OF CANINE RETRACTORS
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1. ON THE BASIS OF LOCATION A. BUCCAL CANINE RETRACTOR. B. PALATAL CANINE RETRACTOR.
2. ON THE BASIS OF PRESENCE OF LOOP OR HELIX A. CANINE RETRACTORS WITH LOOP. B. CANINE RETRACTORS WITH HELIX.
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3. ON THE BASIS OF DIRECTION OF FORCE APPLICATION A. PUSH TYPE CANINE RETRACTOR. B. PULL TYPE CANINE RETRACTOR.
4. ON THE BASIS OF THICKNESS OF WIRE USED A. SELF SUPPORTED CANINE RETRACTOR. B. PROTECTED OR GUIDED CANINE RETRACTOR. www.indiandentalacademy.com
BUCCAL CANINE RETRACTOR (SELF SUPPORTED)
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BUCCAL CANINE RETRACTOR
SELF SUPPORTED www.indiandentalacademy.com 0.7mm
SUPPORTED 0.5mm
ACTIVATION
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REVERSE LOOP CANINERETARCTOR (HELICAL CANINE RETRACTOR)
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ACTIVATION
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ACTIVATION
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U-LOOP CANINE RETRACTOR
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Activation
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PALATAL CANINE RETRACTOR
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PALATAL CANINE RETRACTOR WITH A MODIFIED RETENTIVE ARM
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ANY DOUBTS? www.indiandentalacademy.com
THANK YOU www.indiandentalacademy.com Leader in continuing dental education
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