Changing trends in preadjusted edgewise system
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The document discusses the evolution of preadjusted edgewise systems from the 1970s to present. It notes that early prescriptions from Andrews and Roth used standardized torque values that did not account for variability between patients. Later systems from Wick Alexander and Andrew introduced brackets with variable torque and angulation settings to better individualize treatment. The document emphasizes that torque and angulation values must be coordinated between the incisors and other teeth to avoid occlusal disturbances or root approximations. Ideal values depend on a patient's unique skeletal and dental relationships rather than standardized means.
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Changing trends in preadjusted edgewise system
- 1. Changing Trends inChanging Trends in Preadjusted EdgewisePreadjusted Edgewise systemsystem www.indiandentalacademy.com
- 3. ““anchorage burning appliance” - - -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°www.indiandentalacademy.com
- 4. 1974, Ronold Roth:1974, Ronold Roth: www.indiandentalacademy.com
- 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 www.indiandentalacademy.com
- 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. www.indiandentalacademy.com
- 16. Andrews Roth Alex Root Benett Hilgers Incisor torque www.indiandentalacademy.com
- 17. Andrews Andrews Roth Alex Root Bennett Hilgers Max Canine Position www.indiandentalacademy.com
- 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. www.indiandentalacademy.com
- 23. SNA - 84SNA - 8400 SNB – 77SNB – 7700 ANB- 7ANB- 700 Mnd- FH- 25Mnd- FH- 2500 U1 to SN -103U1 to SN -10300 U1 to NA- 26U1 to NA- 2600 , 3mm, 3mm L1 to MP- 102L1 to MP- 10200 L1 to NB- 30L1 to NB- 3000 , 6mm, 6mm www.indiandentalacademy.com
- 26. SNA - 79SNA - 7900 SNB – 82SNB – 8200 ANB- 3ANB- 300 Mnd- FH- 23Mnd- FH- 2300 U1 to SN -108U1 to SN -10800 U1 to NA- 25U1 to NA- 2500 , 3mm, 3mm L1 to MP- 90L1 to MP- 9000 L1 to NB- 23L1 to NB- 2300 , 3mm, 3mm www.indiandentalacademy.com
- 28. SNA - 84SNA - 8400 SNB – 78SNB – 7800 ANB- 6ANB- 600 Mnd- FH- 36Mnd- FH- 3600 U1 to SN -114U1 to SN -11400 U1 to NA- 32U1 to NA- 3200 , 8mm, 8mm L1 to MP- 93L1 to MP- 9300 L1 to NB- 26L1 to NB- 2600 , 4mm, 4mm www.indiandentalacademy.com
- 29. Cl. III Cl. I Cl.II Cl. III Cl. I Cl. II Cl. III Cl. I Cl. II www.indiandentalacademy.com
- 30. Maxillary deficiency Normal transverse relationship Mandibular deficiency At the incisor level: www.indiandentalacademy.com
- 31. Hypo-maxilla Normo -transversal Hypo-mandible At the Canine Level www.indiandentalacademy.com
- 32. Maxillary deficiency Normal transverse relationship Mandibular deficiency At the Molar level: www.indiandentalacademy.com
- 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. www.indiandentalacademy.com
- 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 www.indiandentalacademy.com
- 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. www.indiandentalacademy.com
- 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. www.indiandentalacademy.com
- 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. www.indiandentalacademy.com
- 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.www.indiandentalacademy.com
- 54. “A normal face is no longer one where cephalometric values are closest to the mean, but one whose cephalometric values show harmony in their relationships defined in 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. www.indiandentalacademy.com