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The canine retraction /certified fixed orthodontic courses by Indian dental academy
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The canine retraction /certified fixed orthodontic courses by Indian dental academy

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The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.

Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078

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The canine retraction /certified fixed orthodontic courses by Indian dental academy The canine retraction /certified fixed orthodontic courses by Indian dental academy Presentation Transcript

  • INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • CUSPID RETRACTION – THE FIRST STEP The canine – its special Key role in canine protected occlusion Anterior smile and facial aesthetics Long Root, proximity to cortical plates Class 1 canine relationship is a prime orthodontic treatment objective Cuspid retraction the first step www.indiandentalacademy.com
  • The canine – its special Severely malpositioned canines –a biomechanical challenge Placing a super elastic wire in severely displaced situations will only magnify side effects ,extend time in therapy without results www.indiandentalacademy.com
  • Does segmental cuspid retraction followed by incisor retraction conserve anchorage ? NO Segmental canine retraction indicated to relieve severe crowding, correct a class1 relation ship,maintain the midline www.indiandentalacademy.com
  • Factors For Biomechanical Design You need to control 1.Force magnitude and direction 2.Force constancy(Low Load Deflection) 3.Control over the center of rotation 4.Change in M/F ratio with deflection www.indiandentalacademy.com
  • Control over the Center of rotation will define the type of tooth movement Axial inclination of the canines is an important factor www.indiandentalacademy.com
  • Single force on a 1. mesially inclined tooth tips it further mesially. •M:F 12:1 for root movement 2. Upright tooth tips it mesially •M:F 10:1 for translation 3. Distally inclined Tooth uprights it •M:F 7:1 for tipping www.indiandentalacademy.com
  • Do you think a NiTi wire will generate a M:F ratio of 12:1 to upright this tooth ?? Should you go segmental ?? www.indiandentalacademy.com
  • The ‘T’ loop is the answer !! www.indiandentalacademy.com
  • ‘T’ Loop Introduced by Burstone in 1982 Most researched and documented spring in orthodontics Perhaps least used !!! Differential space closure Min Patient Cooperation-Fail Safe Axial inclination control Rotations Optimum biologic response Convenience www.indiandentalacademy.com
  • 10 mm 2 mm 4 mm BETA (POSTERIOR) SEGMENT 5 mm ALPHA (ANTERIOR) SEGMENT Standard ‘T’ loop (0.017x0.025” TMA) Alpha moment Beta moment ‘T’ loop pre-activated www.indiandentalacademy.com
  • Neutral position: 0 mm activation 0 gm force Concept of differential moments: activation 6 mm – M:F at anterior seg. 5:1 3 mm deactivation - M:F at anterior seg. 8:1 6 mm deactivation - M:F at anterior seg. 12:1 Interesting to note how the Crot of the canine remains practically constant throughout the retraction www.indiandentalacademy.com
  • Centered V Bend Intrusive forces=extrusive forces Opposing moments /2 couple system Off-centered V bend Moment greater in the posterior segment reinforces anchorage www.indiandentalacademy.com
  • 0.017x0.025” TMA/centered T loop Activation: 6 mm F/A = 33 gm/mm 1126 gm-mm 1002 gm-mm 201 gm 168 gm Deactivation: 1 mm M/F=6.0 www.indiandentalacademy.com M/F=5.6
  • 0.017x0.025” SS/vertical loop Activation: 0.2 mm F/A = 1000 gm/mm 200 gm 0 gm Deactivation: 0.2 mm Clinically impossible !!! www.indiandentalacademy.com
  • ‘T’ loop has a low load deflection rate of 33 gm per millimeter. An error in activation of 1 mm results in an error of only 33 gm. Extremely forgiving !! As compared to SS, which produces double the Error. Burstone did his home work !! Have you !?! www.indiandentalacademy.com
  • 6 mm activation M/F=6:1 Tipping 2 mm Deactivation M/F=10:1 Translation 4 mm Deactivation M/F =12:1 Root Movement www.indiandentalacademy.com
  • FORCE SYSTEM GENERATED BY ‘T’ SPRING FOR INTER-BRACKET DISTANCE OF 25 MM DISPLACEMENT FORCE (GM) 0 1 2 3 4 5 6 7 ANTERIOR M/F (D) POSTERIOR M/F (D) 0 42 85 124 170 216 262 310 0 40 21 15 12 10 9 7.6 0 42 22 16 12 10 9 7.5 www.indiandentalacademy.com
  • SEGMENTAL CUSPID RETRACTION Minor Cuspid Retraction Favorable root inclination,mild crowding Placing cuspid in class1 relationship www.indiandentalacademy.com
  • Minor Cuspid retraction Cuspid Retraction > 2mm Controlled tipping M/F = 8:1 Controlled Tip 017x025 TMA ,45Degree bend in beta leg to produce a posterior M/F of 11/1 First order antirotation bends on the legs www.indiandentalacademy.com
  • The‘ T www.indiandentalacademy.com loop ’
  • 0.017 x 0.025” TMA wire www.indiandentalacademy.com
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  • 5mm www.indiandentalacademy.com
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  • 5mm www.indiandentalacademy.com
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  • 10mm www.indiandentalacademy.com
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  • 5mm www.indiandentalacademy.com
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  • 10 mm 2 mm 4 mm BETA (POSTERIOR) SEGMENT 5 mm ALPHA (ANTERIOR) SEGMENT www.indiandentalacademy.com
  • Pre-activation bends β D = L- A 2 www.indiandentalacademy.com α
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  • β α 1 2 5 6 3 4 www.indiandentalacademy.com
  • Anti-rotation bends 1 2 www.indiandentalacademy.com
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  • Why bypass mechanics? Unfavorable movement of the incisors -one of the major disadvantages of PEA Need to maintain incisor position Fluctuating forces Multiple forces and moments at each bracket-wire interface www.indiandentalacademy.com
  • Walking the canine: Normal component of force and frictional resistance Tooth tips until opposing corners contact the wire Wire deflects Moments are generated to upright the tooth www.indiandentalacademy.com
  • Canine uprighting – couples generated by wire-bracket contact Beware: do not see your patient before 4 wks min. 4 weeks time for uprighting Force required to retract canine = 100 gm + force to overcome frictional resistance (100 gm) www.indiandentalacademy.com
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  • OSTEOGENIC DISTRACTION OF CANINES: EXCITING PROSPECTS www.indiandentalacademy.com
  • 6 mm and 11 days – believe it or not !! www.indiandentalacademy.com
  • Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com