Comparative biomechanics in orthodontics /certified fixed orthodontic courses by Indian dental academy

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Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a widea
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
range of dental certified courses in different formats.

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Comparative biomechanics in orthodontics /certified fixed orthodontic courses by Indian dental academy

  1. 1. COMPARATIVE BIOMECHANICS IN ORTHODONTICS INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. Why is it so different ?? Relation of Point of force application Centre of Resistance www.indiandentalacademy.com
  3. 3. Location of CRes www.indiandentalacademy.com
  4. 4. Location of CRes www.indiandentalacademy.com
  5. 5. Location of Contacts www.indiandentalacademy.com
  6. 6. Effect of Forces www.indiandentalacademy.com
  7. 7. Compative Biomechanics Alignment Leveling and Space Closure Finishing www.indiandentalacademy.com
  8. 8. Compative Biomechanics Alignment Leveling and Space Closure Finishing www.indiandentalacademy.com
  9. 9. Leveling and Alignment Intrusion – Teeth with Normal inclination www.indiandentalacademy.com
  10. 10. Leveling and Alignment Intrusion – Proclined Teeth www.indiandentalacademy.com
  11. 11. Leveling and Alignment Intrusion – Retroclined/Upright Teeth www.indiandentalacademy.com
  12. 12. Leveling and Alignment Lower arch - Similar effect - Re-enforcement of Anchorage www.indiandentalacademy.com
  13. 13. Leveling and Alignment Leveling of lower arch www.indiandentalacademy.com
  14. 14. Leveling and Alignment Leveling of lower arch www.indiandentalacademy.com
  15. 15. Leveling and Alignment Effect of Reverse Curve Mushroom Archwire on Lower Incisors in Adult Patients: A Prospective Study Ryoon-Ki Hong, Hun-Pyo Hong, Hee-Sook Koh (Angle Orthod 2001;71:425–432.) www.indiandentalacademy.com
  16. 16. Leveling and Alignment www.indiandentalacademy.com
  17. 17. Leveling and Alignment www.indiandentalacademy.com
  18. 18. Leveling and Alignment Rotation Control Difficult to Engage Wire Lower Magnitude of Moment www.indiandentalacademy.com
  19. 19. Leveling and Alignment www.indiandentalacademy.com
  20. 20. Leveling and Alignment Rotation Control 1. 2. 3. 4. 5. 6. 7. Tight ligation, double over tie – resilient wire –CuNiTi Looped wire / offsets Reciprocal rotation with power chain Correct one at a time Power chain to anchor unit or archwire hook Smith’s rotation tie Half rotation tie to buccal composite button www.indiandentalacademy.com
  21. 21. Leveling and Alignment Smith’s rotation Tie Looped Archwire www.indiandentalacademy.com
  22. 22. Bite Plane Effect Especially seen with brackets with bite plane Kurz-Ormco 7th Generation www.indiandentalacademy.com
  23. 23. Bite Plane Effect Helps in bite opening Intrusive force on incisors Posterior eruption Depends on inclination Control in High angle www.indiandentalacademy.com
  24. 24. Bite Plane Effect Upto 2mm opening and 3 incisors contact – Acceptable More opening and < 3 incisor contact   Periodontal trauma Discomfort Composite build-ups www.indiandentalacademy.com
  25. 25. Bite Plane Effect Composite Build-ups www.indiandentalacademy.com
  26. 26. Bite Plane Effect Incisors may not occlude with bite planes Increased Overjet / Reverse overjet www.indiandentalacademy.com
  27. 27. Bite Plane Effect Loss of Anchorage 1. 2. Space closure in Excessive/Reverse overjet Disocclusion    Loss of inter-cuspation Easier tipping – Mesio-distal / Bucco-lingual Extrusion www.indiandentalacademy.com
  28. 28. Compative Biomechanics Alignment Leveling and Space Closure Finishing www.indiandentalacademy.com
  29. 29. Space Closure Intrusion and retraction www.indiandentalacademy.com
  30. 30. Space Closure Intrusion and retraction www.indiandentalacademy.com
  31. 31. Space Closure Anchorage Considerations 1. Adult patients 1. 2. 3. 4. 2. 3. 4. 5. Non growing Reduced PDL Support Mutilated occlusion Restriction in use of HG/ Lip bumper etc Bite plane effect – Disclusion(??) Tongue kept away from teeth Higher in lower arch – uprighting effect of leveling Cortical anchorage www.indiandentalacademy.com
  32. 32. Space Closure Cortical Anchorage - Takemoto www.indiandentalacademy.com
  33. 33. Space Closure – Effects Bowing Vertical Bowing (Rollercoaster effect) •Highly placed canines •Distally tipped canines •Rapid space closure (esp on resilient wires) www.indiandentalacademy.com
  34. 34. Space Closure – Effects Bowing Transverse Bowing www.indiandentalacademy.com
  35. 35. Space Closure – Effects Bowing Transverse Bowing - Prevention www.indiandentalacademy.com
  36. 36. Space Closure – Effects Bowing Transverse Bowing - Prevention www.indiandentalacademy.com
  37. 37. Compative Biomechanics Alignment Leveling and Space Closure Finishing www.indiandentalacademy.com
  38. 38. Finishing 1. Tooth related problems 2. Mechanical difficulties www.indiandentalacademy.com
  39. 39. Finishing – Tooth Related Problems  Adult    patients Abraded teeth Missing teeth Very demanding  Lingual   Poorly finished Bulky crowns  Lingual   restorations anatomy Variations Difficult to vary bracket height www.indiandentalacademy.com
  40. 40. Finishing – Mechanical considerations  Point of force application away from buccal surface  Reduced inter-bracket distance    Difficult to place bends Difficult to engage wire Difficulty in rotation correction Short Inter-bracket Span www.indiandentalacademy.com
  41. 41. Finishing – Mechanical considerations  Longer time to express bracket prescriptions  Wire changes and activations after 6-8 weeks  Appliance to be left in position for additional 3 months after achieving correction www.indiandentalacademy.com
  42. 42. Better Finishing  Accurate diagnosis and Treatment planning  Accurate bracket placement – lab procedures  Prevent problems  Light forces  Prevent bowing  Proper alignment & complete expression of torque www.indiandentalacademy.com
  43. 43. REMEMBER  More Sensitive on lingual side  More demanding patient  Wires become more rigid… so watch for side effects  Lingual appliance tips teeth lingually   Anchorage – Extraction decision Loss of Torque www.indiandentalacademy.com
  44. 44. www.indiandentalacademy.com
  45. 45. www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com

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