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Changing trends in preadjusted edgewise system /certified fixed orthodontic courses by Indian dental academy


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Changing trends in preadjusted edgewise system /certified fixed orthodontic courses by Indian dental academy

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  2. 2. INDIAN DENTAL ACADEMY Leader in continuing dental education
  3. 3. “anchorage burning appliance” - - A torque of 7° on central incisors was soon found to be insufficient, since the play between archwire and bracket slot, which wasn’t taken into account, creates important loss of information during retraction stages and hence the amount torque necessary to compensate for the unwanted lingual tipping was clearly greater than 7°
  4. 4. 1974, Ronold Roth:
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  8. 8. Wick Alexander :
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  10. 10. “Fully Programmed Translation brackets” by Andrew’s - These are three sets of information mixed according to the treatment needs. -These come in 3 sets bearing values of angulation, torque and anti rotation
  11. 11. “Minimum translation brackets”
  12. 12. “Medium Translation Brackets”
  13. 13. “Maximum Translation Brackets”
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  15. 15. Summarizing so far… -All the above prescriptions globally reflect the treatment philosophy of their different authors. -It will be necessary for the practitioner to complete the programme by adding information to the wire.
  16. 16. Incisor torque Andrews Roth Alex Root Benett Hilgers
  17. 17. Canine Position Andrews Andrews Roth Alex Root Max Bennett Hilgers
  18. 18. Evolution toward facial type This evolution is also taking place in cephalometrics where the notion of mean now tends to be replaced by growth considerations. This corresponds to the need for individualization of information. Since variability in the morphology of the facial skeleton necessarily implies variability in the dento-alveolar compensations.
  19. 19. “Dolichofacial”
  20. 20. “Brachyfacial”
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  23. 23. SNA - 840 SNB – 770 ANB- 70 Mnd- FH- 250 0 U1 to SN -103 0 U1 to NA- 260, 3mm L1 to MP- 1020 L1 to NB- 300, 6mm
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  26. 26. 0 SNA - 79 0 SNB – 820 ANB- 30 Mnd- FH- 230 U1 to SN -1080 U1 to NA- 250, 3mm L1 to MP- 900 L1 to NB- 230, 3mm
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  28. 28. SNA - 840 SNB – 780 ANB- 60 Mnd- FH- 360 U1 to SN -1140 U1 to NA- 320, 8mm L1 to MP- 930 L1 to NB- 260, 4mm
  29. 29. Cl. III Cl. I Cl.II Cl. III Cl. I Cl. II Cl. III Cl. I Cl. II
  30. 30. At the incisor level: Maxillary deficiency Normal transverse relationship Mandibular deficiency
  31. 31. At the Canine Level Hypo-maxilla Normo -transversal Hypo-mandible
  32. 32. At the Molar level: Maxillary deficiency Normal transverse relationship Mandibular deficiency
  33. 33. Thus, In the absence of functional anomalies: 1. The dento-alveolar compensations (inclination and angulation) take place in a coherent way, in accordance with every single facial type, determined by skeletal relationships, either established in the three planes.
  34. 34. 2. No matter what technique is used, the information (torque and angulation) we apply must also be coherent in the three planes. In the sagittal plane, the inclinations (or torque ) of the incisors must be coordinated with the angulations of the buccal segments in a well balanced dento-alveolar system
  35. 35. •The torque level is high on the incisors, the angulation values in the buccal segments, especially on the canines will be greater. •On the contrary, if the torque level on the incisors is low, the angulations in the buccal segments, especially on the canines, will be smaller.
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  37. 37. In this case, the high torque level on the incisors doesn’t come with a sufficient angulation of the buccal segments; this creates a high risk of root approximation.
  38. 38. Here, the high level of torque on the incisors comes with a sufficient canine angulation but an insufficient angulation of the bicuspids; this creates an occlusal disturbance and a risk of root approximation.
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  52. 52. Here, the canine has a positive torque, which is adopted to the transverse skeletal relationships: if the torque on the bicuspids is not coordinated, an occlusal disharmony is created.
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  54. 54. “A normal face is no longer one where cephalometric values are closest to the mean, but one whose cephalometric values show relationships harmony defined in in their variable association tables. In this concept, there is no such thing as a unique normal face defined by a mean value, there are a series of normal faces” - J. Dibbets.
  55. 55. Leader in continuing dental education