Headgear /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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Headgear /certified fixed orthodontic courses by Indian dental academy

  1. 1. Geared-upGeared-up OrthodonticsOrthodontics Use of HG in day to dayUse of HG in day to day practicepracticeINDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. • History • Classification • Components • Biomechanics – Direction – Magnitude – Duration • Clinical points – Bending of Inner bow – Bending of Outer bow • Practical management • Uses – For the orthodontics purpose (with fixed appliance) • Anchorage reinforcement • Distal movement • Molar rotation – For orthopaedic purpose (with removable/fixed appliances) • Splint Headgear • Activator headgear • Patient motivation • Warning and safety www.indiandentalacademy.com
  3. 3. HistoryHistory Changing views of treatment with extra-oral anchorage www.indiandentalacademy.com
  4. 4. ClassificationClassification of Head-gearsof Head-gears Headgear appliances are often described by their relationship to the occlusal plane : •Above the Occlusal plane = high pull •In line with Occlusal plane = combi-pull •Below the Occlusal plane = low pullwww.indiandentalacademy.com
  5. 5. High Pull Head-gear No change www.indiandentalacademy.com
  6. 6. Combi-Pull Head-gear No change www.indiandentalacademy.com
  7. 7. Low Pull Head-gear No change www.indiandentalacademy.com
  8. 8. ComponentsComponents 1. Molar tube 2. Facebow 3. Force module 4. Head strap www.indiandentalacademy.com
  9. 9. Components of Head-gear assembly No change www.indiandentalacademy.com
  10. 10. Molar Tube: No change www.indiandentalacademy.com
  11. 11. Facebows – types: No change www.indiandentalacademy.com
  12. 12. Inner-outer bow type • Commonly used with fixed or functional/removable appliance. • Inner bow is available in either: – 0.045 inch – 0.051 inch • Outer bow diameter is : – 0.072 inch www.indiandentalacademy.com
  13. 13. J-hook type • An alternative method of applying extra-oral forces to a fixed appliance. • The hooks are termed ‘J’ hook on account of their shape and are attached directly to the arch wire usually in the incisor region. www.indiandentalacademy.com
  14. 14. 131211 • Each J-hook consist of a 0.072 inch wire contoured so as to fit over a small soldered stop on the arch wire. 1 3 1 2 1 1 www.indiandentalacademy.com
  15. 15. Force Modules No change www.indiandentalacademy.com
  16. 16. Head strap No change www.indiandentalacademy.com
  17. 17. BiomechanicsBiomechanics 1. Direction 2. Magnitude 3. Duration www.indiandentalacademy.com
  18. 18. Force (The only prescription in orthodontics) • Since force is the treatment agent, it is imperative to master the fundamental of biomechanics. • The design of the force system predetermines the general direction in which – the tooth, – group of teeth, or – skeletal unit responds. www.indiandentalacademy.com
  19. 19. • The quantity of force can be controlled rather well. • However, exact prediction of the tissue response and the growth behaviour in an individual case is highly speculative. • It is therefore mandatory to monitor the mechanics according to the reactions observed at each treatment visit. www.indiandentalacademy.com
  20. 20. Center of Resistance • Applying a force through the center of resistance will lead to a pure translatory movement along the force vector. • Unless the force direction is parallel with the occlusal plane, tooth will also move vertically (intrusion & extrusion). www.indiandentalacademy.com
  21. 21. • Applying a force away from the center of resistance will lead to a combination of tranlatory and rotational movement. • The amount of rotational effect will depend on the distance of the force vector at right angle from the center of resistance. www.indiandentalacademy.com
  22. 22. • The relative amounts of angular change and translation are determined by the length of the shortest distance between the line of force and the center of resistance. www.indiandentalacademy.com
  23. 23. • Since the kind of reaction to an applied force system is so strongly dependent on the sit of the center of resistance, it is of paramount importance to estimate where its location will be. www.indiandentalacademy.com
  24. 24. It is Postulate that … • The nasomaxillary complex, suspended as it is by a sutural system comparable to the desmodermal system of a tooth, therefore possess a center of resistance. www.indiandentalacademy.com
  25. 25. Some of naso-maxillary complex sutures • Zygomatico-maxillary • Fronto-maxillary • Naso-maxillary • Zygomatico-maxillary • Zygomatico-temporal • Palato-maxillary www.indiandentalacademy.com
  26. 26. • A force vector would have to pass through the center of resistance of the dentition and through the center of resistance of the maxilla if no rotational effects are to be induced. www.indiandentalacademy.com
  27. 27. • According to observed clinical reactions the location of the center of resistance of the maxillary complex must be somewhere in the area of the postero-superiorpostero-superior aspect of theaspect of the zygomatico-maxillaryzygomatico-maxillary suture.suture. www.indiandentalacademy.com
  28. 28. A word of caution:- • The location of the center of resistance of a biologic entity cannot be exactly determined in advance and furthermore is subjected to alteration by tissue and other factors. www.indiandentalacademy.com
  29. 29. Cervical Anchorage with low-pull Headgear Anti-clockwise Rotation Clockwise Rotation Translation www.indiandentalacademy.com
  30. 30. Occipital Anchorage with combi-pull Headgear Anti-clockwise Rotation Clockwise Rotation Translation www.indiandentalacademy.com
  31. 31. Parietal Anchorage with high-pull Headgear Anti-clockwise Rotation Clockwise Rotation Translation www.indiandentalacademy.com
  32. 32. Direction of force application is further affected by: 1. Length of outer-bow of the facebow. 2. Angulation of the outer-bow relative to the inner-bow, in the horizontal plane. www.indiandentalacademy.com
  33. 33. • Rather than considering in detail all possible combinations of variables, it is best to understand only a few. • The essential issue is the relationship between the direction of the extra-oral force and the center of resistance of the unit to be moved. www.indiandentalacademy.com
  34. 34. Varying Outer Bow Length No change www.indiandentalacademy.com
  35. 35. Magnitude of ForceMagnitude of Force www.indiandentalacademy.com
  36. 36. Magnitude of Force No change www.indiandentalacademy.com
  37. 37. Clinical pointsClinical points www.indiandentalacademy.com
  38. 38. The effect of a typical kloehn cervical headgear www.indiandentalacademy.com
  39. 39. Headgear with edgewise strap up and initial levelling wire www.indiandentalacademy.com
  40. 40. www.indiandentalacademy.com
  41. 41. Control on inter-molar width with Transpalatal Arch (TPA) www.indiandentalacademy.com
  42. 42. Use of headgear for retraction of molar and premolars www.indiandentalacademy.com
  43. 43. For the expansion of upper arch www.indiandentalacademy.com
  44. 44. Patient MotivationPatient Motivation www.indiandentalacademy.com
  45. 45. Controlling Factors • The effectiveness of HG therapy is influenced by factors controlled by the orthodontist, such as : – Direction & Magnitude of HG force • And by factors that are largely under the control of the patient, such as: – Duration of HG wear or patient compliance. www.indiandentalacademy.com
  46. 46. • High degree of co-operation on the part of the patient is a must. • Best to fit the headgear at the commencement of the treatment, because it is difficult to increase the patient’s motivation part way through treatment. • Motivation can often be maintained with the use of charts which the patient completes to record the time the appliance is worn each day. This is an optional slide as Prof can talk a lot on this topic. www.indiandentalacademy.com
  47. 47. Warning and SafetyWarning and Safety www.indiandentalacademy.com
  48. 48. Inform both, the patient and his/her parents :- 1. Hold the bow in the mouth while the traction force is engaged or disengaged. 2. Immediately hold and restrain the bow if it becomes loose. 3. No vigorous activity when wearing the headgear. 4. Never wear the headgear without the safety device being in place. 5. Report any damage or breakage of the appliance as soon as possible. 6. Stop wearing the headgear, and contact the orthodontist if the bow comes out at night.www.indiandentalacademy.com
  49. 49. www.indiandentalacademy.com Thank you For more details please visit www.indiandentalacademy.com

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