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

  1. 1. Brackets in Orthodontics INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. Seven Clinical Principles of Interactive Twin Mechanisms John C. Voudouris JCO, Jan 1997 www.indiandentalacademy.com
  3. 3. Seven Interactive Principles ► Based on clinical evaluation of three such systems—Sigma, Interactwin and Damon ► Ligation systems: 1. Conventional LigationTime consuming - www.indiandentalacademy.com
  4. 4. Seven Interactive Principles - Elastomeric ligatures show deformation, force decay, decomposition and increased friction www.indiandentalacademy.com
  5. 5. Seven Interactive Principles Steel ligatures - Have sharp ends - Can attract plaque and food debris 2.Ligature-free twin mechanisms exert two degrees of control - First degree - Second degree www.indiandentalacademy.com
  6. 6. Seven Interactive Principles ► Produce low friction compared to conventional ligatures ► New interactive twin systems combine both tie wings and precision arms - If precision arm is broken, offers the possibility of conventional ligation - If higher friction is required www.indiandentalacademy.com
  7. 7. Seven Interactive Principles ► Active and Passive Systems: - - Active interaction of the precision arm seats the archwire in the base of the slot, using reduced functional friction Passive interaction relies on control of larger rectangular archwires to reduce friction www.indiandentalacademy.com
  8. 8. Seven Interactive Principles ► Conventional ligation may or may not seat the archwire in the base of the slot Envelopes of Arch Wire Engagement www.indiandentalacademy.com
  9. 9. Seven Interactive Principles ► The Principles: www.indiandentalacademy.com
  10. 10. Seven Interactive Principles 1. Archflow: - Refers to the flow mechanics of the interactive bracket along the archwire and the distal drift of the initial archwire itself 2. Acculock: The precision arm locks the archwire within the dimensions of the slot in an “all or nothing” manner www.indiandentalacademy.com
  11. 11. Seven Interactive Principles Primary factor contributing to the controlled tooth movement over conventional ligation - Metal ligatures or stretched elastomers can cause a displaced archwire to catch the labial edges of the slot 3. Autoseat: - Responsible for the light, continuous force of the Sigma appliance - www.indiandentalacademy.com
  12. 12. Seven Interactive Principles Results in precise early autorotation and inout corrections - During space closure, prevents tipping and rotation of teeth into the extraction space - Seats resilient rectangular wires - With the passive systems, rotation control is achieved by using larger rectangular archwires - www.indiandentalacademy.com
  13. 13. Seven Interactive Principles 4. Arch Flexibility: - In all three interactive systems, the low friction of the precision arms reduces interbracket archwire deflections - Metal ligation produces large archwire deflection moments and archwire binding 5. Anchorage Conservation: www.indiandentalacademy.com
  14. 14. Seven Interactive Principles 6. Asepsis: - Conventional ligatures retain plaque, calculus, and food debris external to the bracket body - The precision arm is integrated into the bracket body - Tie-wing undercuts are also left open for self-cleansing www.indiandentalacademy.com
  15. 15. Seven Interactive Principles ► Asepsis: www.indiandentalacademy.com
  16. 16. Seven Interactive Principles 7. Adaptation: - Relates to both orthodontic finishing and team dynamics - In finishing, vertical elastics over the open tie wings promote better interdigitation - Interactive systems become part of the daily orthodontic routine when the orthodontist and staff are able to adapt as a team www.indiandentalacademy.com
  17. 17. Additional Bracket Options ► Use of Lower Second      Premolar Tubes: MBT Has been made possible by the flexibility of HANT wires Cleaner, more comfortable Reduced bulk Friction free Are self ligating www.indiandentalacademy.com
  18. 18. Straight Wire: The Next Generation ► Introduced by Creekmore and Randy in 1993, AJO ► Frequently, anticipated results are not achieved by using preadjusted appliances and straight wires . www.indiandentalacademy.com
  19. 19. Straight Wire: The Next Generation There are at least five reasons – 1. Inaccurate bracket placements A mean error of .34 mm in vertical plane and 5.54˚ for angular placement - Balut et al ► 2. Variations in tooth structure www.indiandentalacademy.com
  20. 20. Straight Wire: The Next Generation 3. Variations in antero-posterior and vertical jaw relations require variations in the position of the maxillary and mandibular incisors 4. Need for overcorrection Mechanical deficiencies of the edgewise appliance a. Force application away from CRes. 5. www.indiandentalacademy.com
  21. 21. Straight Wire: The Next Generation b. Play between arch wire and slot - Can be minimized in the tipping, torquing, and vertical planes by "filling" the slot - Rotational play c. Force diminution Threshold of force Tooth movement will stop before the arch wire has completely returned to its original shape www.indiandentalacademy.com
  22. 22. Straight Wire: The Next Generation THE SLOT MACHINE www.indiandentalacademy.com
  23. 23. Straight Wire: The Next Generation ► Not really a bracket placement device ► Orients the arch wire slot of the bracket relative to the facial surface of each tooth on the model ► Accomplished by the use of orientation templates and a rotation guide ► The bracket, is attached to the tooth with bonding material that fills in any gap between the bracket base and the tooth www.indiandentalacademy.com
  24. 24. Straight Wire: The Next Generation ► Customized base maintains the orientation of the arch wire slot ► A standard edgewise bracket that has 0° torque, 0° tip, and 0° rotation can be oriented with a Roth prescription www.indiandentalacademy.com
  25. 25. Straight Wire: The Next Generation www.indiandentalacademy.com
  26. 26. Straight Wire: The Next Generation Advanced Preadjusted Appliance Fabrication ► Torque – with the use of an Incisor Torque Template (Creekmore Enterprises ) www.indiandentalacademy.com
  27. 27. Straight Wire: The Next Generation ► Tip – can be varied on the posterior teeth - accommodate morphologic variations and overcorrections - ► Rotations- can be measured by using rotational guides www.indiandentalacademy.com
  28. 28. Straight Wire: The Next Generation ► Height – much more precise height measurements are possible Requires proper planning of individual tooth movement www.indiandentalacademy.com
  29. 29. Evolution of Brackets Based on Materials www.indiandentalacademy.com
  30. 30. Angles Era ► Initially all attachments were made in noble metals and their alloys - gold (75%) -platinum -iridium -silver www.indiandentalacademy.com
  31. 31. Angles Era Advantages – 1. Esthetically pleasing 2. Corrosion resistant ► Disadvantages – 1. Lack of flexibility 2. Tensile strength ► www.indiandentalacademy.com
  32. 32. Angles Era ► In 1887 Angle tried replacing the noble metals with German silver (Cu, Ni, Zn) ► Angle later varied its composition - Jack and traction screws - Expansion arches - Bands Stainless steel replaced all these materials www.indiandentalacademy.com
  33. 33. Metal Brackets ► 1. 2. 3. ► 1. 2. 3. Advantages of the metal brackets Excellent strength Reduced friction Smooth surface finish Disadvantages of the metal brackets – Corrosion Biocompatibility Esthetics www.indiandentalacademy.com
  34. 34. Plastic brackets ► ► Introduction of new materials like polycarbonates and polysulfones Advantage – Esthetically acceptable when compared to steel. www.indiandentalacademy.com
  35. 35. Plastic brackets ► 1. 2. 3. 4. DisadvantagesStaining and discoloration. Poor dimensional stability Undue friction between the bracket slot and the wire made sliding mechanics difficult. Need for compatible bonding resin www.indiandentalacademy.com
  36. 36. Plastic brackets ► Plastic brackets with metal inserts www.indiandentalacademy.com
  37. 37. Ceramic brackets ► These were introduced in early 1980’s ► Zulauf’s brackets: opaque and bulky ► Earlier ceramic brackets were made of aluminaBrittle –fracture was common www.indiandentalacademy.com
  38. 38. Ceramic brackets ► Later Zirconia brackets were introduced - Surface hardening treatment was done - Lower Young’s modulus - Higher overall strength Disadvantage – Increased coefficient of friction - www.indiandentalacademy.com
  39. 39. Ceramic brackets ► 1. 2. 3. 4. 5. Advantages of ceramic brackets over plasticStain resistant Durable Good dimension stability Custom moulded for individual teeth Allowed incorporation of the SWA feature www.indiandentalacademy.com
  40. 40. Ceramic brackets ► Polycrystalline alumina-Dentaurum Signature, Rocky Mtn ► PCA with metal slot- Unitek ,Clarity ► Monocystalline alumina-A Co, Starfire ► Polycrystalline Zirconia- Yamura,Toray www.indiandentalacademy.com
  41. 41. Ceramic brackets Ceramic Bracket With Metal Insert www.indiandentalacademy.com
  42. 42. Ceramic brackets ► 1. 2. 3. 4. 5. DisadvantagesFracture…problems of inventory Hardness Bulkier High friction Enamel damage at the time of removal www.indiandentalacademy.com
  43. 43. Composite Bracket ► Two or more polymers ► These have properties intermediate between those of the constituents ► Materials should be so chosen that the property of one constituent improves the deficient property of others www.indiandentalacademy.com
  44. 44. Composite Bracket www.indiandentalacademy.com
  45. 45. Titanium brackets ► Alternative to stainless steel - in patients who had sensitivity to Ni. ► Advantages-CAL manufacture - excellent biocompatibility. - small size - matte finish blends better with the tooth. - low thermal conductivity - no metallic taste www.indiandentalacademy.com
  46. 46. Titanium brackets Rematitan Bracket www.indiandentalacademy.com
  47. 47. Titanium brackets ► Disadvantage – -difficult to fabricate -not as esthetic as stainless steel www.indiandentalacademy.com
  48. 48. Gold Brackets ► Biocompatible ► Esthetics www.indiandentalacademy.com
  49. 49. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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