Evolution of orthodontic brackets /certified fixed orthodontic courses by Indian dental academy


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Evolution of orthodontic brackets /certified fixed orthodontic courses by Indian dental academy

  1. 1. EVOLUTION OF ORTHODONTIC BRACKETS INDIAN DENTAL ACADEMYLeader in continuing dental education www.indiandentalacademy.com
  2. 2. The Universal BracketDeveloped by Dr.Spencer R Atkinson --1928Appliance has undergone periodicrefinements without losing its essentialfeatures. Modified to improve its leverage androtational potential . www.indiandentalacademy.com
  3. 3. Design- -vertical hallow shaft with two lateral welding tabs -central shaft has two slot openings1. Horizontal – opening labially at gingival third2. Vertical –opens incisally near the base and extends gingival one third of the bracket height -. www.indiandentalacademy.com
  4. 4. Original Bracket www.indiandentalacademy.com
  5. 5. Five Archwire Combinations Available www.indiandentalacademy.com
  6. 6. The incisal slot can hold-.008-.016 roundor .008 x.020 up to .015 x .028 wire . - corrections of rotations ,leveling or torque.Gingival slot can only hold round wireranging from .008 - .016 -mesiodistal axial inclinations ,act as aguide when teeth are moved bodily inmesial or distal direction. www.indiandentalacademy.com
  7. 7. The 3-D Universal Bracket(1974) -Jorge Fastlicht www.indiandentalacademy.com
  8. 8. Comparison of Previous Universal Bracket with 3-D Universal www.indiandentalacademy.com
  9. 9. Six basic movements www.indiandentalacademy.com
  10. 10. Six basic movements www.indiandentalacademy.com
  11. 11. Conventional light Wire bracket and 3 - D Universal Bracket Easy ligation Use of two wires simultaneously . As the bracket is wide very light wires are used in initial stages. Improve rotation potential. More space inside the vertical shaft. www.indiandentalacademy.com
  12. 12. The 3-D Universal Bracket Advantage-1. Efficiency in leveling and aligning2. Permits bodily movement in m-d direction3. Retracts canine without tipping4. Torque automatically in most cases5. Individual torque is also easily achieved www.indiandentalacademy.com
  13. 13. Broussard BracketWas designed by “Grayford broussard”Modified edgewise bracket in which thereis addition of 0.0185 x 0.046 slot –toaccept 0.018 auxiliary wireBrackets are patented by the R.M.company .Utilizes the two force technique. www.indiandentalacademy.com
  14. 14. Broussard Bracket Features –-quick wing-vertical slot-round corners, smooth surface- horizontal slot-special torque brackets.- 0,7˚,17˚,22˚-insert pin www.indiandentalacademy.com
  15. 15. Broussard Bracket www.indiandentalacademy.com
  16. 16. Broussard Bracket www.indiandentalacademy.com
  17. 17. Burstone Cuspid BracketBracket design--consists of a basic .022 x .028 edgewiseslot-additional .017 x .025vertical or horizontalauxiliary . www.indiandentalacademy.com
  18. 18. Transition from .022 to .018 slot The use of rectangular wires in rectangular brackets was introduced by Edward Angle. The original appliance was designed for use with gold arch wires and had a 22 x 28 slot . In Angels concept of treatment ,sliding teeth along the arch wires to close spaces was unnecessary www.indiandentalacademy.com
  19. 19. Transition from .022 to .018 slot At that time the appliance was designed to produce appropriate force and a reasonable range in torsion when gold arch wires were used Problem originated when steel wires replaced ? There was a need to redesign the edgewise www.indiandentalacademy.com
  20. 20. Transition from .022 to .018 slot Solution to this problem was obtained by .022 .018 www.indiandentalacademy.com
  21. 21. Transition from .022 to .018 slot Using undersized wire in edgewise bracket is way by which friction can be reduced. Sliding teeth along the arch wire requires atleast 2 mil of clearance . www.indiandentalacademy.com
  22. 22. Concept Of Fully Preadjusted ApplianceReed Holdaway- made the first attempt toalter bracket slots in 1958.Second attempt in this direction was madeby Ivan LeeJoseph R Jarabak was first to combinetwo features in 1961 –Jarabak light wirebracket manufactured by Rocky MountainOrthodontics www.indiandentalacademy.com
  23. 23. Roths Prescription In 1976 –Ronald Roth published a report entitled “Five year clinical evaluation of the Andrews Straight Wire Appliance”. In 1979 roth introduced a bracket set up with his own modifications keeping in mind –1. Biologic consideration .2. Mechanical consideration. www.indiandentalacademy.com
  24. 24. Roths Prescription Roths rationale –1. With the appliance in place ,it is virtually impossible ,because of the bracket interference ,to position the teeth precisely into occlusion shown by non orthodontic normal sample2. After appliance removal ,no matter how well treated the patient may be ,the teeth will shift slightly from the position they occupied at the time appliance was removed. www.indiandentalacademy.com
  25. 25. Bioefficient BracketIt is a modification of preadjusted systemintroduced by Viazi .The bracket prescriptions were designedto overcorrect malocclusion and to make itpossible to work with the largest possiblewires from the start of the treatment . www.indiandentalacademy.com
  26. 26. Bioefficient Bracket Rationale behind the bracket design is-- maximum potential of any archwire is achieved when the largest possible wire is used. The archwire between a narrow single bracket will have less stiffness and greater flexibility . www.indiandentalacademy.com
  27. 27. Bioefficient Bracket The bracket is designed to fulfill following requirements-1. Conformity to the crown anatomy and gingival outline www.indiandentalacademy.com
  28. 28. Bioefficient Bracket2. Ease of use- Variability in the bracket positioning is usually attributable to improper mesiodistal or buccolingual placement of the slot www.indiandentalacademy.com
  29. 29. Bioefficient Bracket www.indiandentalacademy.com
  30. 30. Bioefficient Bracket3. Minimum friction www.indiandentalacademy.com
  31. 31. Bioefficient Bracket4. Tip control www.indiandentalacademy.com
  32. 32. Bioefficient Bracket5. Rotational control-narrow ,elongated configuration of the bracket ,with the wings moved towards the mesiodistal surface of the teeth provide maximum rotational control www.indiandentalacademy.com
  33. 33. Bioefficient Bracket6. Vertical slot6. High torque in the anterior brackets. www.indiandentalacademy.com
  34. 34. Modular Self Locking Appliance Introduced by –FOGEL AND MAGILL -1976 Key objective to treat greater number ,better ,faster easier ,at a lower cost and by using an appliance which can achieve the optimal biologic response. www.indiandentalacademy.com
  35. 35. Modular Self Locking ApplianceIt is a light wiresystem using a singlepivotal bracket or twinself locking lowfrictional attachments . www.indiandentalacademy.com
  36. 36. Modular Self Locking Appliance Insert bracket –Archwire chamberBeaksInsert slotSlot apexSeatstem www.indiandentalacademy.com
  37. 37. Modular Self Locking Appliance www.indiandentalacademy.com
  38. 38. Modular Self Locking AppliancePlacement of theinsert bracket- www.indiandentalacademy.com
  39. 39. Modular Self Locking Appliance Receptacle –available in three sizes- Small (.150”)- Medium (.180”)- Wide (.200”)- Three vertical slots are present which accommodate insert brackets and the auxiliaries www.indiandentalacademy.com
  40. 40. Modular Self Locking Appliance www.indiandentalacademy.com
  41. 41. Modular Self Locking Appliance Archwire play www.indiandentalacademy.com
  42. 42. Modular Self Locking ApplianceInsertion of wire intothe insert bracket www.indiandentalacademy.com
  43. 43. Modular Self Locking ApplianceRemoval of archwire www.indiandentalacademy.com
  44. 44. Vari Simplex DisciplineThe actual appliance was born in 1978. All the brackets used in this systempretorqued , preangulated and exhibit specific bracket base thickness for in/out compensations . www.indiandentalacademy.com
  45. 45. Vari Simplex Discipline Factors determining the design of the appliance-1. Size and shape of the teeth ,especially mesio distal width and curvature .2. Selection of proper bracket style to fit the size and the shape of each tooth .3. Accessibility of the tooth .4. Patient comfort . www.indiandentalacademy.com
  46. 46. Vari Simplex Discipline Factors defining the bracket system--Type of bracket-Placement positions-Angulations-Torque-In /out compensations www.indiandentalacademy.com
  47. 47. Vari Simplex Discipline Brackets used in vari simplex1. Twin bracket-- Used on large flat surfaced teeth.-Mini –Diamond bracket inrhomboid design.- Advantage –a) Flat surface .b) Easy accessibility .c) Mini twin bracket .d) Patient comfort. www.indiandentalacademy.com
  48. 48. Vari Simplex DisciplineTwin bracket on the lateral incisor areprovided with additional tie wing for easyinitial wire placement.Additional permanent hooks are presenton the lateral incisor www.indiandentalacademy.com
  49. 49. Vari Simplex Discipline2. Lang bracket-- Was invented by Dr Howard Lang- Used round surfaced teeth at the corners of the arch . Design--single bracket a flat rotational control wing-each wing has a circular hole .- Wedge shape in profile www.indiandentalacademy.com
  50. 50. www.indiandentalacademy.com
  51. 51. www.indiandentalacademy.com
  52. 52. Vari Simplex Discipline Reasons for using Lang bracket on cuspids-1. Twin bracket reduces the inter-bracket distance.2. Better rotational control.3. Full bracket engagement with a twin bracket is difficult on a round surfaced tooth.4. Prevents attrition on the maxillary cuspid. www.indiandentalacademy.com
  53. 53. Vari Simplex Discipline3. Lewis bracket-- They are used for large round surfaced teeth that are not at the curve of the arch - bicuspids .- Small flat surface teeth - mandibular incisors. www.indiandentalacademy.com
  54. 54. Vari Simplex Discipline Design –- Consists of fixed wing single bracket with built in labial curvature of the rotational wings .- This provides a three point contact .- Bracket is wedge shape in profile view www.indiandentalacademy.com
  55. 55. Vari Simplex Discipline Advantages of using fixed Lewis wing over flexible Steiner wing-1. Additional force .2. Save adjustment time.3. Edges of the Lewis bracket are less sharp .4. Breakages are less . www.indiandentalacademy.com
  56. 56. Vari Simplex Discipline Salient features-1. -3˚ torque on maxillary cuspid2. No torque in the second molar tube.3. -5˚ lingual crown torque in the mandibular incisors www.indiandentalacademy.com
  57. 57. Thank you for watching For more details please visitwww.indiandentalacademy.com www.indiandentalacademy.com