TORQUE IN ORTHODONTICS (short PPT) basic

Torque in orthodontics short ppt

1. Torque in orthodontics Presented by – Dr. Kangjam Sylvia MDS 2nd year

2. CONTENTS Introduction Importance of Torque Biomechanics in Torque Torque expression in slot 0.018 and 0.022 Torque clearance Types of Torque Factors affecting Torque Torque in face and base Torque in different technique Conclusion References 2

3. Introduction 3

4. Why? When? How? Erman D. Rauch. Torque And Its Application To Orthodontics. AJODO Volume 1959 Nov (817 - 830).

5. IMPORTANCE OF TORQUE Erman D. Rauch. Torque And Its Application To Orthodontics. AJODO Volume 1959 Nov (817 - 830). 5

6. BIOMECHANICS IN TORQUE Torque or root movement The centre of rotation of tooth M/F ratio Erman D. Rauch. Torque And Its Application To Orthodontics. AJODO Volume 1959 Nov (817 - 830). 6

7. According to Nanda, M/F = 5/1 uncontrolled tipping M/F = 7/1 controlled tipping M/F = 10/1 translation M/F = 12/1 root torque Erman D. Rauch. Torque And Its Application To Orthodontics. AJODO Volume 1959 Nov (817 - 830). 7

8. TORQUE EXPRESSION IN 0.018 SLOT AND 0.022 SLOT 0.017×0.025 inch 0.019×0.025 inch 6° 10° Anterior tooth morphology and its effect on torque M. van Loenen, J. Degrieck, G. De Pauw and L. Dermaut. European Journal of Orthodontics 27 (2005) 258–262 8

9. TORQUE CLEARANCE Arch wire inches stst Amount of play 0.016×0.022 16-18 degree 0.017×0.025 13-14 degree 0.019×0.025 6-8 degree 0.021×0.025 2-3 degree Erman D. Rauch. Torque And Its Application To Orthodontics. AJODO Volume 1959 Nov (817 - 830). 9

10. TYPES OF TORQUE PASSIVE TORQUE Torque that incorporated into the rectangular arch wire to accomodate for position of the tubes and or brackets on the buccal and labial surface of the teeth. ACTIVE TORQUE Torque that placed into the rectangular arch wire either to correct the axial inclination of the teeth or as a anchorage preparation 10

11. TYPES OF ACTIVE TORQUE ACTIVE LABIAL TORQUE Torque in anterior segment Crown to move labially and root palatally Intrusion and retraction of anteriors PROGRESSIVE TORQUE Torque in buccal segment Correction of buccal crossbite ACTIVE ROOT THRUST Buccal segment of arch wire Thrust the root against the buccal cortex Form of anchorage re-enforcement 11

12. FACTORS AFFECTING TORQUE 12 Anterior tooth morphology and its effect on torque M. van Loenen, J. Degrieck, G. De Pauw and L. Dermaut. European Journal of Orthodontics 27 (2005) 258–262

13. TORQUE IN FACE VS BASE 13 The Torque In the base allows the slot of the fully programmed bracket target correctly on the crown’s mid transverse plane Torque in the face causes occluso gingival variation in the placement of slot point over mid transverse plane Lawrence F. Andrews. Straight-Wire The Concept and Appliance. L.A. Wells Co., 1989.

14. TORQUE IN DIFFERENT TECHNIQUE 14

15. TORQUE IN EDGEWISE APPLIANCE 15 With edgewise third-order mechanics

16. TORQUE IN BEGG’S APPLIANCE 16 P.R. Begg , Peter Kesling . Begg Orthodontic Theory and Technique. 3 rd edition ,1977.

17. 0.012” Premium Plus wire The four spur type auxiliary 5mm length 1mm short from the gum 0 degree inclination to the occlusal plane Angulated midway Force increase with decrease in the diameter in the circle P.R. Begg , Peter Kesling . Begg Orthodontic Theory and Technique. 3 rd edition ,1977. 17

18. Pre-wound/rat trap type 18 Dr. Begg in early 1950s Simpler to apply Deliver large amount of force through a greater range of movement P.R. Begg , Peter Kesling . Begg Orthodontic Theory and Technique. 3 rd edition ,1977.

19. Kitchton’s torquing auxiliary 19 P.R. Begg , Peter Kesling . Begg Orthodontic Theory and Technique. 3 rd edition ,1977.

20. Root torque by kesling 20 Upper premolar which needs buccal root torque P.R. Begg , Peter Kesling . Begg Orthodontic Theory and Technique. 3 rd edition ,1977.

21. Reciprocal torquing auxiliary 21 used in cases where two adjacent teeth require root torque in opposite directions. The 'Spec' auxiliary could be used for controlling the root movements during the first and second stages if made in lighter 0.009" or 0.010" size wires P.R. Begg , Peter Kesling . Begg Orthodontic Theory and Technique. 3 rd edition ,1977.

22. Reverse torquing auxiliary 22 for controlling the roots of canines or pre-molars design in the 1987 for the labial root movement of a palatally impacted maxillary canine An offset placed in auxiliary to bypass the main wire rotated by 180 degree for activating it P.R. Begg , Peter Kesling . Begg Orthodontic Theory and Technique. 3 rd edition ,1977.

23. Mollenhauer’s aligning auxiliary(maa) 23 P.R. Begg , Peter Kesling . Begg Orthodontic Theory and Technique. 3 rd edition ,1977.

24. Torque in straight wire appliance 24 -9 ° -9 ° -7 ° -7 ° -7 ° +3 ° +7 ° Upper 7 6 5 4 3 2 1 -35 ° -30 ° -22 ° -17 ° -11 ° -1 ° -1 ° Lower Lawrence F. Andrews. Straight-Wire The Concept and Appliance. L.A. Wells Co., 1989.

25. WAGON WHEEL EFFECT Lawrence F. Andrews. Straight-Wire The Concept and Appliance. L.A. Wells Co., 1989. 25

26. ROTH PHILOSOPHY 26 SWA 7 3 -7 -7 -7 -9 -9 ROTH 12 8 -2 -7 -7 -14 -14 SWA -1 -1 -11 -17 -22 -30 -35 ROTH -1 -1 -11 -17 -22 -30 -30 Roth selected brackets from Andrews translation bracket set up and developed the Roth treatment and prescription. Available in 1976 and considered as the second generation of PEA Ronald H. Roth. The Straight-Wire Appliance 17 Years Later. Volume 21 : number 09 : pages (632-642) 1987.

27. Torque in mbt 27 Given by Richard P McLaughlin, John C Bennett, Hugo J Trevisi Upper Inclination Lower inclination Central +17 Central -6 Lateral +10 Lateral -6 Canine 7 / -7 Canine 6 / -6 1 st premolar -7 1 st premolar -12 2 nd premolar -7 2 nd premolar -17 1 st molar -14 1 st molar -20 McLaughlin, Bennett, Trevisi . Systemized Orthodontic Treatment Mechanics. Mosby, 2001

28. 28 Increased incisor torque in MBT prescription in comparison to SWA McLaughlin, Bennett, Trevisi . Systemized Orthodontic Treatment Mechanics. Mosby, 2001

29. Upper canine torque 29 1 3 1 3 1 3 - 7 ° Torque ° Torque + 7 ° Torque Square or Ovoid Arch Tapered Arch Ovoid or Tapered Arch McLaughlin, Bennett, Trevisi . Systemized Orthodontic Treatment Mechanics. Mosby, 2001

30. Lower canine torque 30 3 4 3 4 3 4 - 6 ° Torque ° Torque Square or Ovoid Arch Ovoid or Tapered Arch Tapered Arch + 6 ° Torque McLaughlin, Bennett, Trevisi . Systemized Orthodontic Treatment Mechanics. Mosby, 2001

31. Upper molar torque 31 The upper molars frequently show excessive buccal crown torque with palatal cusps “hanging down” which creates centric, balancing side and working side interferences For this reason it is preferable to use -14° of buccal root torque in these teeth, as opposed to only -9° of buccal root torque in SWA. McLaughlin, Bennett, Trevisi . Systemized Orthodontic Treatment Mechanics. Mosby, 2001

32. Lower premolar and molar torque 32 - 10 ° - 20 ° - 17 ° - 12 ° - 6 ° - 35 ° - 30 ° - 22 ° - 17 ° - 11 ° Difference +25 ° +10 ° +5 ° +5 ° +5 ° McLaughlin, Bennett, Trevisi . Systemized Orthodontic Treatment Mechanics. Mosby, 2001

33. INTERCHANGEABLE UPPER PREMOLAR BRACKETS 33 Similarly, the torque value allows premolar brackets to be interchangeable, which helps inventory control, too. McLaughlin, Bennett, Trevisi . Systemized Orthodontic Treatment Mechanics. Mosby, 2001

34. TORQUE IN SELF LIGATION SYSTEM 34 Upper Arch U1 U2 U3 U4 U5 U6 U7 High torque 17° 10° 7° Standard torque 12° 8° 0°- 7° -7° - 18° -27° Low torque 7° 3° Lower Arch L1 L2 L3 L4 L5 L6 L7 High torque 7° Standard torque -1° -1° -0° -12° -17° -28° -10° Low torque - 6° - 6° David Birnie . The Damon Passive Self- Ligating Appliance System ( Semin Orthod 2008;14:19-35) .

35. 35 David Birnie . The Damon Passive Self- Ligating Appliance System ( Semin Orthod 2008;14:19-35) .

36. 36 David Birnie . The Damon Passive Self- Ligating Appliance System ( Semin Orthod 2008;14:19-35) .

37. TORQUE IN BUTTERFLY SYSTEM S. Jay Bowman. The Butterfly System. 2004, JCO. 37

38. FEATURES S. Jay Bowman. The Butterfly System. 2004, JCO. 38

39. S. Jay Bowman. The Butterfly System. 2004, JCO. 39

40. CONCLUSION 40

41. REFERENCES 41 D’Souza, Kiran Kumar, Shetty, and Kishore: The Rat Trap Lingual Torquing Auxiliary. JCO/ december 2013 McLaughlin, Bennett, Trevisi . Systemized Orthodontic Treatment Mechanics. Mosby, 2001. Lawrence F. Andrews. Straight-Wire The Concept and Appliance. L.A. Wells Co., 1989. Ronald H. Roth. The Straight-Wire Appliance 17 Years Later. Volume 21 : number 09 : pages (632-642) 1987. R.G. “Wick” Alexander. The 20 Principles of the Alexander Discipline. Quintessence Publishing Co, Inc., 2008. 6. Lawrence F. Andrews:The six keys to normal occlusion - AJO-DO 1972 Sep (296-309).

42. 42 Erman D. Rauch. Torque And Its Application To Orthodontics. AJODO Volume 1959 Nov (817 - 830). 8. Anterior tooth morphology and its effect on torque M. van Loenen, J. Degrieck, G. De Pauw and L. Dermaut. European Journal of Orthodontics 27 (2005) 258–262 9. Kang et al. Three-dimensional relationship between the critical contact angle and the torque angle. AJODO, 2003. Volume 123, Number 1

43. THANK YOU 43