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Pg canin retracton /certified fixed orthodontic courses by Indian dental academy
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Pg canin retracton /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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Pg canin retracton /certified fixed orthodontic courses by Indian dental academy Pg canin retracton /certified fixed orthodontic courses by Indian dental academy Presentation Transcript

  • INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  • A SIMPLIFIED APPROACH TOWARDS www.indiandentalacademy.com
  • INTRODUCTION The newer orthodontic materials such as TMA with wide spectrum of mechanical properties, have added to the versatility of orthodontic treatment. BURSTONE stated “The TMA should permit the design of future appliances which deliver the SUPERIOR FORCE SYSTEMS WITH SIMPLIFIED CONFIGURATION”. Here the TMA has been successfully replaced stainless steel to simplify PG canine retraction spring. www.indiandentalacademy.com
  • AIM OF THE STUDY To compare efficacy of original PG canine retraction, and modified spring : 1. To compare rate and amount of canine retraction. 2.To compare canine tipping and rotation. 3. To compare anchorage loss. www.indiandentalacademy.com
  • CANINE RETRACTION www.indiandentalacademy.com
  • The canines are key stones of occlusion. Correct positioning of the canine after retraction in I-pre molar extraction cases is imperative for function, stability, and esthetics. This requires the creation of a bio mechanical system to deliver a predetermined force and a relatively constant moment-to-force ratios in order to avoid distal tipping and rotation. www.indiandentalacademy.com
  • Friction mechanics : Sliding the canine through arch wire gives undesirable side effects. • Binding, • Friction, • Extrusion and rotation, • Distal tipping, • Bending of arch wire, there by… Temporary or permanent stops in the tooth movement. www.indiandentalacademy.com
  •  Frictionless mechanics : • Accomplishes space closure by means of retraction springs. • Making it possible to apply predetermined and precise forces which can meet the biomechanical requirements for planned tooth movements. • Friction and binding of the tooth are eliminated. • Tipping and rotations can be controlled. www.indiandentalacademy.com
  • PG CANINE RETRACTION SPRING – POUL GJESSING – IN 1985 The spring is pre calibrated to deliver predictable moment to force ratios in all three planes of space, to produce a controlled, bodily displacement within the desired range of activation. www.indiandentalacademy.com
  • NEED FOR MODIFICATION  ORIGINAL SPRING IS • Complex and bulky, • Less comfortable to the patient, • Problem in maintaining oral hygiene, • Complex fabrication, • Difficult in activation. www.indiandentalacademy.com
  • THE MODIFIED SPRING www.indiandentalacademy.com
  • SELECTING TMA OVER STAINLESS STEEL 1. TMA deflected twice than S.S. as far without permanent deformation, 2. Working range is 1.6 times that of S.S., 3. Modulus of elasticity less than that of S.S., www.indiandentalacademy.com
  • 4. Extra oral anchorage demands are less than those for s.s., 5. Spring back is superior to that of S.S., 6. Corrosion resistance comparable to S.S. 7. The forces that are produced by TMA are 0.4 times than that of s.s. www.indiandentalacademy.com
  • FUNDAMENTAL BIOMECHANICS www.indiandentalacademy.com
  • THE CR OF CANINE : Shown to be located in the center of the root one third of the distance from the alveolar crest to the apex. www.indiandentalacademy.com
  • FOR TRANSLATION OF CANINE : The displacement of canine depends on the relationship between the line of force and the center of resistance (CR) Application of force through CR. www.indiandentalacademy.com
  • M=FXD D = 11 mm Force application Distal tipping www.indiandentalacademy.com
  • M=FXD D = 4 mm Force application Rotation www.indiandentalacademy.com
  • Force application Anti tip couple Moment to force ratio = 11 www.indiandentalacademy.com
  • Anti rotational couple Force application Moment to force ratio = 7 www.indiandentalacademy.com
  • PG CANINE RETRACTION SPRING 35º Anti rotation bend 5.5 mm 10 mm Apical loop 30º 15º Beta bend Anti tip bend 12º 2 mm Occlusal loop www.indiandentalacademy.com
  • Distal horizontal activation of 100 gm www.indiandentalacademy.com
  • MODIFIED PG CANINE RETRACTION SPRING Anti rotation bend Beta bend Anti tip bend www.indiandentalacademy.com
  • The Alpha, Beta and anti rotation bends are increased, since slightly more than double as compare to original spring. TMA gives 0.4 of force as compare to S.S   With Distal sweep www.indiandentalacademy.com
  • EVALUATION OF MODIFIED PG SPRING : To match the horizontal activation of 100 gm. www.indiandentalacademy.com
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  • The apical loop of test springs are opened by 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm each spring is activated to measure the force.  DIAL  CALIPERS has been used for above. DONTRIX GAUGE was used for force measurement. www.indiandentalacademy.com
  • 2.5 mm The 2.5 mm loop after activation showed horizontal force matched of 100 gm force approximately with Dontrix gauge.  Above design has been selected for modified spring. www.indiandentalacademy.com
  • Horizontal activation can be done by activating the spring until the legs of loop come close together. www.indiandentalacademy.com
  • CRITERIA FOR CASE SELECTION • MODERATE TO MAXIMUM ANCHORAGE CASES. • CLASS-I OR CLASS-II MOLAR RELATION. • I-BICUSPID EXTRACTION CASES. WHICH REQUIRES INDIVIDUAL CANINE RETRACTION. Age selection : 13 to 25 yrs both in boys and girls. www.indiandentalacademy.com
  • TREATMENT MECHANICS :  Leveling of buccal segments  The retraction started at the same time on both sides, Pre Adjusted Edgewise system, 018 slot, ROTH prescription.  Springs are fabricated from  016 X O22 stain less steel wire (for original spring),  016 x 022 inch TMA wire (for modified spring). www.indiandentalacademy.com
  • TEMPLATE USED FOR SPRING FABRICATION Modified spring original spring www.indiandentalacademy.com
  • ACTIVATIONS :  EVERY 4 WEEKS ( 1 visit ) RIGHT SIDE :  Modified PG spring (TMA)  Activated 2.5 mm LEFT SIDE :  Original PG spring (S.S.)  Activated by two loops are separated by 1mm www.indiandentalacademy.com
  • ADVANTAGES OF MODIFIED PG SPRING  Increased retraction, rate and amount of canine  Decreased canine tipping and rotations,  Decreased anchor loss.  Less deformation and distortion,  Properties are not lost during bending and activations, www.indiandentalacademy.com
  •  Reduced bulk,  More comfortable for patient,  Ease of fabrication,  Less chair side time for fabrication,  Easily adjustable. www.indiandentalacademy.com
  • CASE REPORTS www.indiandentalacademy.com
  • CASE-I Beginning of canine retraction Rt side 5.75 mm Lt side 6 mm www.indiandentalacademy.com
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  • AFTER 12 WEEKS….. ( 3rd visit ) Rt side 5.75 mm space closed. Lt side 4 mm space closed. www.indiandentalacademy.com
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  • AFTER 20 WEEKS….. ( 5th visit ) Lt side 6 mm space closed. www.indiandentalacademy.com
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  • CASE-II Beginning of canine retraction Rt side 5.25 mm Lt side 5 mm www.indiandentalacademy.com
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  • Comparison with IOPA Before canine retraction www.indiandentalacademy.com
  • AFTER 8 WEEKS….. ( 2nd visit ) Rt side 3.75 mm space closed Lt side 2.5 mm space closed www.indiandentalacademy.com
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  • AFTER 20 WEEKS….. ( 5th visit ) Rt side space closed 3rd visit Lt side space closed 5th visit www.indiandentalacademy.com
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  • Comparison with IOPA After canine retraction www.indiandentalacademy.com
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  • CASE-III Beginning of canine retraction UPPER Rt side 7 mm Lt side 5.5 mm www.indiandentalacademy.com
  • LOWER ARCH RT SIDE 6.75 MM LT SIDE 6.5 MM www.indiandentalacademy.com
  • AFTER 4 WEEKS….. ( 1st visit ) UPPER ARCH Rt 2 mm Lt 1.25 mm space closed www.indiandentalacademy.com
  • Lower arch rt side 1.85 mm, lt side 1.25 mm space closed. www.indiandentalacademy.com
  • AFTER 12 WEEKS….. ( 3rd visit ) www.indiandentalacademy.com
  • Rt side 6 mm space4 closed, Rt side 7 mm space closed Lt side 5 mm space closed. Lt side 2.5 mm space closed www.indiandentalacademy.com
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  • Case-IV Beginning of canine retraction Rt side 7 mm, Lt side 7 mm. www.indiandentalacademy.com
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  • AFTER 12 WEEKS….. ( 3rd visit ) www.indiandentalacademy.com
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  • Rt side 7 mm, lt side 5 mm space closed. www.indiandentalacademy.com
  • CONCLUSION In this age of stupendous technological development and research, many appliance systems flooded orthodontic fraternity. As mentioned in this paper modification for canine retraction spring is no exception. The truth of future orthodontics is to use this simple modified canine retraction spring to our at most advantage not compromising on treatment goals. www.indiandentalacademy.com
  • ACNOWLEDGEMENTS Dr. E. Muniratnam Naidu Principal Dr. P. Jayakumar HOD & Professor Dept of Orthodontics & Dentofacial Orthopedics Staff & Post graduate students Dept of Orthodontics & Dentofacial Orthopedics Meenakshi Ammal Dental College & Hospital Chennai. www.indiandentalacademy.com
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