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Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
Space closure 3 /certified fixed orthodontic courses by Indian dental academy
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Space closure 3 /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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  • 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com 3 www.indiandentalacademy.com
  • 2. Mushroom loop o Apical addition of wire in archial configuration o More patient friendly- reduces the horizontal part of wire near vestibule o Beta-titanium CNA M loop- 0.017 x 0.025 o Activation upto 5 mm o Reactivation- every 6-8 wks o Bypass premolars, IBD www.indiandentalacademy.com
  • 3. o Single cuspid retraction, en masse anterior retraction o NiTi intrusion arch, tied piggyback to SS archwire www.indiandentalacademy.com
  • 4. o Preformed M loop space closing archwires o Preactivation- separating the legs by 3mm. Gable bends- mesial to increase anterior moment distal to increase anchorage moment o Torque in distal leg eliminated- wire passive in third order in buccal segment o Loop reactivated until there is atleast 3 mm of space closure o After space closure, wire left in mouth for 1-2 visitsroot uprightingwww.indiandentalacademy.com
  • 5. www.indiandentalacademy.com
  • 6. Double keyhole loop o Roth treatment mechanics o Introduced by John Parker- 0.019 x 0.026 o Concept  Complete space closure with one set of archwires  Allows operator to select how space will be closed  Activation- cinching wire distal to last molar tube www.indiandentalacademy.com
  • 7. PG Retraction Spring o Poul Gjessing- 1985 o Controlled tipping- uprightingover long periods of activation o Net result- bodily movement o Preformed-0.016 x 0.022 SS o Double ovoid apical helix- 10mm o Smaller occlusally placed helixactivation further closes the loops www.indiandentalacademy.com
  • 8. o Segment of circle in distal leg- eliminate undesirable moments acting on 2nd premolar www.indiandentalacademy.com
  • 9. PG Retraction Spring o For canine retraction- 160gms o Double helix separated by 1mm o Resist tipping & rotational tendencies -not correct rotation or extreme inclination o Leveling of buccal segment –must o Activation- every 4 wks o Each activation- 1.5mm of controlled movement www.indiandentalacademy.com
  • 10. PG Retraction Spring o Controlled incisor retraction o Auxiliary molar tube- lateral incisor bracket o Twist anterior leg 90˚ - 3mm in front of vertical helix- fit in vertical tube of lateral bracket o Intrusive force- 12-25gms each side o Estimated treatment time- 5-6 months on an avg www.indiandentalacademy.com
  • 11. o Used for retraction of both canine and incisors o Incisor segment intrusion- 20-25gms/side o Mesial and distal extensions angulated to build in residual moments o Vertical forces in the posterior segment counteracted by forces of occlusion www.indiandentalacademy.com
  • 12. Opus loop o Described by Raymond E. Siatkowski o M/F for translation  Individual teeth: 7.1-10.2 mm  Groups of teeth: 8.0-9.1 mm o Most closing loops M/F 4-5 mm o To achieve net translation, add residual moment  Gable bends anterior & posterior  Posterior gable band & anterior wire-bracket twist www.indiandentalacademy.com
  • 13. Opus loop Disadvantage of gable bend o Tipping- translation- uprighting o Correct magnitude of residual moments are difficult to achieve o Changing areas of stress distribution in the pdl may not yield most rapid, least traumatic method of space closure www.indiandentalacademy.com
  • 14. Opus loop o Study: design and verify loop design capable of delivering M/F inherently without adding residual moments. o Castigliano’s Theorem: to derive of M/F ratio in terms of loop geometry. www.indiandentalacademy.com
  • 15. Standard Opus 70 loop M/F ratio on both the ends is equal www.indiandentalacademy.com
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  • 18. K-SIR LOOP o K-SIR – Kalra Simultaneous Intrusion and Retraction o Continuous 0.019 x 0.025 TMA archwire o Closed loop- 7mm x 2mm www.indiandentalacademy.com
  • 19. K-SIR LOOP www.indiandentalacademy.com
  • 20. K-SIR LOOP www.indiandentalacademy.com
  • 21. K-SIR LOOP o Trial activation- releases stress built up o Reduces the severity of V bend Neutral position www.indiandentalacademy.com
  • 22. K-SIR LOOP o Second premolar bypassed- IBD o Controlled tipping- bodily-root movement o Reactivation 6-8 wks www.indiandentalacademy.com
  • 23. K-SIR LOOP Advantages o Simplicity of design- ease of fabrication o Comfortable to the patient o TMA- low forces, low LDR, long range of action o En masse retraction- Shortens treatment timeprevents appearance of unsightly space distal to incisors. www.indiandentalacademy.com
  • 24. A comparative analysis of commonly used retraction loops in Edgewise mechanics- A FEM Study. Dr. Chetan V. Jayade  Evaluate mechanical behavior of routinely used retraction loops in edgewise mechanotherapy  9 different loop designs evaluated for assessing M/F ratio and F/D rates when subjected to horizontal activation forces www.indiandentalacademy.com
  • 25. o Findings of the study o Opus loop showed highest M/F ratio o ‘T’ loop showed lowest LDR o Loop height= M/F = F/D rate www.indiandentalacademy.com
  • 26. Loops Software o Program developed by Borland Delphi o Simulate any ortho loop connecting 2 brackets o AJO 1997- Demetrios Halazonetis www.indiandentalacademy.com
  • 27. www.indiandentalacademy.com
  • 28. Obstacles to space closure o Inadequate leveling o Damaged brackets o Incorrect force levels o Interference from opposing teeth o Soft tissue resistance www.indiandentalacademy.com
  • 29. Root Torquing o Stage III- correction of labio-lingual & mesiodistal root position o Torquing assessed by  Visual inspection of appearance of teeth  Palpation of roots  From radiographs www.indiandentalacademy.com
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  • 32. Tan auxiliary Boot auxiliary- buccal root torque of molars www.indiandentalacademy.com
  • 33. Uprighting springs o Size of coil o Mini spring- inner diameter of coil- twice the size of wire diameter- coils tiny- difficult to grip o Midi spring- incisors 0.010”,canines-0.012” o Maxi spring- 4 times wire diameter www.indiandentalacademy.com
  • 34. www.indiandentalacademy.com
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  • 36. Torquing of rootso Torquing of roots- twist in the rectangular wire o “The equal and opposite reciprocal reactions (which generally cause undesirable opposite movements of adjacent teeth) are commonly disregarded”. o Biomechanics of torque- An FEM investigationDr. V. P. Jayade www.indiandentalacademy.com
  • 37. Torquing of roots1,2,3 progressively torqued more and more? www.indiandentalacademy.com
  • 38. Torquing of roots- www.indiandentalacademy.com
  • 39. Torquing of rootso Twists in the rectangular archwire seem to be appropriate only when reciprocal torque is required on the adjacent teeth, but beware of high moments. (‘Use undersize wires’- Thurow) o “twists” in the rectangular wire for attaining torque should be employed judiciously, and not indiscriminately. www.indiandentalacademy.com
  • 40. Alternate torquing methods (Thurow) www.indiandentalacademy.com
  • 41. Alternate torquing methods (DeAngelis) o Warren Spring www.indiandentalacademy.com
  • 42. Alternate torquing methods (Burstone, Isaacson) www.indiandentalacademy.com
  • 43. o Cantilever spring- En masse root correction www.indiandentalacademy.com
  • 44. o Rectangular loop- separate canine root correction www.indiandentalacademy.com
  • 45. www.indiandentalacademy.com
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  • 51. Conclusion o Space closure- fricton/frictionless o Anchorage classification o Root torquing www.indiandentalacademy.com
  • 52. Zeal without knowledge is a runaway horse www.indiandentalacademy.com
  • 53. References 1. Contemporary orthodontics.- William R. Proffit 2. Modern Edgewise mechanics and the segmented arch technique.-Dr. Charles J. Burstone 3. Biomechanics in clinical orthodontics- Ravindra Nanda 4. Biomechanics and Esthetic strategies in clinical orthodontics- ravindra Nanda 5. Biomechanics in clinical orthodontics- Michael R. Marcotte www.indiandentalacademy.com
  • 54. References 6. Systemized Orthodontic Treatment Mechanics.McLaughlin, Bennett, Trevisi. 7. Tip-Edge guide and Differential straight- arch technique.-Peter C. Kesling 8. Refined Begg for modern times.- Dr. V. P. Jayade 9. The Alexander Principle. Contemporary concepts and principles.- R. G. Wick Alexander 10. Bio-Efficient 11. Therapy.- Anthony Viazis Fricker www.indiandentalacademy.com
  • 55. References 11. The segmented arch approach to space closure. Charles J. Burstone. Ajo Nov 1982 12. Segmental approach to mandibular molar uprighting.- Roberts, Cracker, Burstone 1982 mar 13. Biomechanical design and clinical evaluation of new canine retraction spring. Poul Gjessing. AJO May 1985 14. Effect of ph on chain elastics- AJO 1990 nov 15. Use of vertical loops in retraction system- Apr 1991 16. Clinical considerations in the use of retraction mechanics. Julie Ann Stagger, JCO June 1991 www.indiandentalacademy.com
  • 56. References 17. An investigation into the characteristics of PG canine retraction spring. Eden and Waters. AJO Jan.1994 18. T-loop position and anchorage control. Kuhlberg and Burstone. AJO 1997 19. Design and test orthodontic loops using your computer. Demetrious J. Halazonetis. AJO Mar 1997 20. Ongoing Innovations in Biomechanics & Materials for the New Millennium- Robert P. Kusy 21. Simultaneous intrusion and retraction of anterior www.indiandentalacademy.com teeth. Varun Kalra. JCO 1998
  • 57. References 21. J- Hook Headgear- John Hickam 22. Continuous arch wire closing loop design, optimization, and verification. Part I & II. Raymond E. Siatkowski. AJO Oct. 1997 22. A comparative analysis of commonly used retraction loops in Edgewise mechanics- A FEM Study. Dr. Chetan V. Jayade 23. Experimental evaluation of frictional resistance in the posterior segment using different wires and posterior attachments- Dr. Ashwini Joshi www.indiandentalacademy.com
  • 58. 26. Biomechanics of torque- An FEM Investigation. Dr V. P. Jayade www.indiandentalacademy.com
  • 59. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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