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

  1. 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. A SIMPLIFIED APPROACH TOWARDS www.indiandentalacademy.com
  3. 3. 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
  4. 4. 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
  5. 5. CANINE RETRACTION www.indiandentalacademy.com
  6. 6. 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
  7. 7. 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
  8. 8.  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
  9. 9. 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
  10. 10. 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
  11. 11. THE MODIFIED SPRING www.indiandentalacademy.com
  12. 12. 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
  13. 13. 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
  14. 14. FUNDAMENTAL BIOMECHANICS www.indiandentalacademy.com
  15. 15. 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
  16. 16. 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
  17. 17. M=FXD D = 11 mm Force application Distal tipping www.indiandentalacademy.com
  18. 18. M=FXD D = 4 mm Force application Rotation www.indiandentalacademy.com
  19. 19. Force application Anti tip couple Moment to force ratio = 11 www.indiandentalacademy.com
  20. 20. Anti rotational couple Force application Moment to force ratio = 7 www.indiandentalacademy.com
  21. 21. 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
  22. 22. Distal horizontal activation of 100 gm www.indiandentalacademy.com
  23. 23. MODIFIED PG CANINE RETRACTION SPRING Anti rotation bend Beta bend Anti tip bend www.indiandentalacademy.com
  24. 24. 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
  25. 25. EVALUATION OF MODIFIED PG SPRING : To match the horizontal activation of 100 gm. www.indiandentalacademy.com
  26. 26. www.indiandentalacademy.com
  27. 27. 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
  28. 28. 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
  29. 29. Horizontal activation can be done by activating the spring until the legs of loop come close together. www.indiandentalacademy.com
  30. 30. 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
  31. 31. 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
  32. 32. TEMPLATE USED FOR SPRING FABRICATION Modified spring original spring www.indiandentalacademy.com
  33. 33. 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
  34. 34. 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
  35. 35.  Reduced bulk,  More comfortable for patient,  Ease of fabrication,  Less chair side time for fabrication,  Easily adjustable. www.indiandentalacademy.com
  36. 36. CASE REPORTS www.indiandentalacademy.com
  37. 37. CASE-I Beginning of canine retraction Rt side 5.75 mm Lt side 6 mm www.indiandentalacademy.com
  38. 38. www.indiandentalacademy.com
  39. 39. AFTER 12 WEEKS….. ( 3rd visit ) Rt side 5.75 mm space closed. Lt side 4 mm space closed. www.indiandentalacademy.com
  40. 40. www.indiandentalacademy.com
  41. 41. AFTER 20 WEEKS….. ( 5th visit ) Lt side 6 mm space closed. www.indiandentalacademy.com
  42. 42. www.indiandentalacademy.com
  43. 43. www.indiandentalacademy.com
  44. 44. CASE-II Beginning of canine retraction Rt side 5.25 mm Lt side 5 mm www.indiandentalacademy.com
  45. 45. www.indiandentalacademy.com
  46. 46. Comparison with IOPA Before canine retraction www.indiandentalacademy.com
  47. 47. AFTER 8 WEEKS….. ( 2nd visit ) Rt side 3.75 mm space closed Lt side 2.5 mm space closed www.indiandentalacademy.com
  48. 48. www.indiandentalacademy.com
  49. 49. AFTER 20 WEEKS….. ( 5th visit ) Rt side space closed 3rd visit Lt side space closed 5th visit www.indiandentalacademy.com
  50. 50. www.indiandentalacademy.com
  51. 51. Comparison with IOPA After canine retraction www.indiandentalacademy.com
  52. 52. www.indiandentalacademy.com
  53. 53. CASE-III Beginning of canine retraction UPPER Rt side 7 mm Lt side 5.5 mm www.indiandentalacademy.com
  54. 54. LOWER ARCH RT SIDE 6.75 MM LT SIDE 6.5 MM www.indiandentalacademy.com
  55. 55. AFTER 4 WEEKS….. ( 1st visit ) UPPER ARCH Rt 2 mm Lt 1.25 mm space closed www.indiandentalacademy.com
  56. 56. Lower arch rt side 1.85 mm, lt side 1.25 mm space closed. www.indiandentalacademy.com
  57. 57. AFTER 12 WEEKS….. ( 3rd visit ) www.indiandentalacademy.com
  58. 58. 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
  59. 59. www.indiandentalacademy.com
  60. 60. www.indiandentalacademy.com
  61. 61. Case-IV Beginning of canine retraction Rt side 7 mm, Lt side 7 mm. www.indiandentalacademy.com
  62. 62. www.indiandentalacademy.com
  63. 63. AFTER 12 WEEKS….. ( 3rd visit ) www.indiandentalacademy.com
  64. 64. www.indiandentalacademy.com
  65. 65. Rt side 7 mm, lt side 5 mm space closed. www.indiandentalacademy.com
  66. 66. 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
  67. 67. 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
  68. 68. www.indiandentalacademy.com

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