INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com

www.indiandentalacademy.com
The MBT Bracket System
• The MBT bracket system is based on a
more balanced mix of science,tradition and
experience.
• It ...
Requirements for Providing
Quality Orthodontic Care
• Good diagnosis and treatment planning.
• Best available bracket syst...
• Ability to level the dental arches and
control overbite.
• Correction of Class II and Class III
discrepancies .
• Contro...
Diagnosis and treatment planning
-The Dental VTO
DENTAL VTO provides organized and simplified
information about direction ...
INITIAL MIDLINE AND MOLAR
POSITION
Right

Left

Midline Molars
Chart 1

www.indiandentalacademy.com
LOWER ARCH DISCREPANCY
Right
Crowding

Left

3x3
6x6

Protrusion
Curve of Spee
Midline
Total

3x3
6x6
Chart 2

www.indiand...
Secondary factors to provide
additional space.
• Interproximal enamel reduction.
• Uprighting or distal movement of lower
...
ANTICIPATED TREATMENT
CHANGE
Right

Left

Midline
Cuspids
1st Molars
Chart-3

www.indiandentalacademy.com
Case - 1
•
•
•
•
•
•
•
•
•

12 year old male patient.
Class II skeletal pattern.
High angle with increased lower facial he...
INITIAL MIDLINE AND MOLAR
POSITION
Right

Left

4mm

3.5mm

1mm
Chart-1

www.indiandentalacademy.com
LOWER ARCH DISCREPANCY
3x3

Right
-3

Left
-1

6x6

-3

-1

Protrusion

-2

-2

Curve of Spee

-1

-1

Midline

+1

-1

3x...
ANTICIPATED TREATMENT
CHANGE
Right

Left

2mm

9mm

0

8.5mm

1.5mm

(7)

(7)
2mm

(7)

(7)
5mm

1mm

Chart-3.

www.indian...
Bracket Specification
THE FIRST GENERATION PAE
• The original SWA was introduced by Andrews in
1972 and it had the feature...
THE SECOND GENERATION PEA
• To avoid inventory difficulties or multiple
bracket system, ROTH recommended a
single applianc...
THE THIRD GENERATION PEA
• The MBT has been developed from the combined
clinical experience of the authors for more than 7...
The MBT Versatile Appliance
System.
Victory Series Brackets.

Unitek Full-Sized Twin
Brackets.

Clarity Brackets.

Molar b...
Design features of a modern
bracket system
• Range of brackets
- Standard size metal brackets.
- Mid-size metal brackets.
...
• Torque in base-the CAD factor
Using CAD it is possible to program the
computer to create the correct relationship
betwee...
• Drawing of original
SWA bracket.
• Dots (upper) and
dashes (lower) were
used for i.d purposes.

www.indiandentalacademy....
• Drawing of MBT
brackets.
• Standard size
brackets have a
rhomboidal form
and numerical
i.d.system.

www.indiandentalacad...
• Lower premolar
bracket may be
offset on specially
designed bases,to
increase bond
strength and reduce
the risk of bond
f...
• Tapered bracket
bases on lower
incisors can help
in plaque control
in this difficult
area.
www.indiandentalacademy.com
Tip specification
ANTERIOR TIP
Reduced anterior tip was incorporated
into the appliance to conform to Andrews
original res...
Incisor Tip

Cuspid Tip

Upper
Central

Upper
Lateral

Lower
Central

Lower
Lateral

Upper

Lower

MBT
Versatile+

4.0°

8...
UPPER POSTERIOR TIP
•Upper bicuspid brackets are provided with
00 tip to keep these teeth in a more upright
position .
•Up...
Bicuspid Tip

Molar Tip

Upper First

Upper
Second

Upper First

Upper
Second

MBT Versatile+

0°

0°

0°

0°

Original SW...
Upper tip considerations
The authors prefer a 00 tip bracket,with
the band seated parallel to the buccal
cusps.This gives ...
LOWER POSTERIOR TIP
•Lower posterior tip in the first and second
bicuspid brackets is maintained at 20, to
slightly inclin...
Lower Bicuspid Tip

Lower Molar Tip

Lower First

Lower
Second

Lower First

Lower
Second

MBT Versatile+

2.0°

2.0°

0°
...
Torque specification
INCISOR TORQUE
•Upper incisor brackets are provided with
additional palatal root torque;while lower
i...
Upper central incisor torque
• Increased palatal
root torque for
upper centrals.

www.indiandentalacademy.com
Upper lateral incisor torque
• Increased
palatal root
torque for
upper lateral
incisors.
www.indiandentalacademy.com
Lower incisor torque
• Increased
labial root
torque for
lower
incisors.
www.indiandentalacademy.com
Incisor Torque

Incisor Torque

Upper Central

Upper
Lateral

Lower
Central

Lower
Lateral

MBT Versatile+

17.0°

10.0°

...
Upper Cuspid ,bicuspid and
molar torque.
•Upper cuspid and bicuspid brackets are
provided with the normal -70 of torque.
•...
• Upper canine torque.
• Available in –70 ,00 ,
+70 , torque.
• The 00 and +70 options
are for cases with
narrow maxillary...
Upper torque considerations
There was a tendency for
upper first molar palatal
cusps to extrude.
In some cases it is neces...
Upper Cuspid, Bicuspid and Molar Torque
Upper
Cuspids

Upper 1st
Bicuspids

Upper 2nd
Bicuspids

Upper 1st
Molars

Upper 2...
Lower cuspid,bicuspid and
molar torque.
•Progressive buccal crown torque is
provided in the brackets of the lower
posterio...
• Lower canine
torque available in
–60 ,00 ,+60 ,
• The 00 and +60
options are for
cases with narrow
mandibular bone
form ...
Lower Cuspid, Bicuspid and Molar Torque
Lower
Cuspids

Lower 1st
Bicuspids

Lower 2nd
Bicuspids

Lower 1st
Molars

Lower 2...
In-out specification
• It is 100% fully expressed.
• In upper premolars an alternative bracket
which is 0.5mm thicker than...
In-out modifications.
• An upper second
bicuspid bracket with an
additional 0.5mm of
in-out compensation is
provided for t...
Horizontal bracket placement
errors
• If brackets are placed
to the mesial or distal
of the vertical long
axis of the clin...
Axial or paralleling bracket
placement errors
• These will occur if the
bracket wings do not
straddle the vertical
long ax...
Thickness errors.
• Excess bonding agent
beneath the bracket
base can cause
thickness and
rotational errors.
• Can be elim...
Vertical errors
• Vertical errors in
bracket placement are
caused by placing
brackets gingival or
incisalocclusal to the
c...
Gingival Concern.
• Partially erupted tooth.
• It is difficult to visualize
the center of the clinical
crown on partially
...
Gingival Inflammation
Gingival inflammation causes foreshortening,effectively
reducing the length of the clinical crowns.
...
Teeth with palatally or lingually
displaced roots.
• Individual teeth with
lingually displaced
roots can produce
short cli...
Teeth with facially displaced
roots.
• Individual teeth with
facially displaced
roots can produce long
clinical crowns.

w...
Incisal or Occlusal concerns.
• Incisal crown
fractures or
tooth wear make
it difficult to
visualize the
center of the
cli...
Crowns with long tapered
buccal cusps
• Cuspids with
tapered clinical
crowns often do not
have adequate
contact with the
o...
Axial/paralleling variation
The tip position of the lateral
incisor brackets was varied to
help root paralleling.
In this ...
Palatally positioned lateral
incisors.
It is important to create adequate
space before attempting to move
palatally placed...
Upper first molar bracket
positioning.
Correct position.
Band is seated more gingivally at
the mesial when treating Class ...
Lower first molar bracket
positioning.
Correct band positioning.
A common error is to allow the
band to seat too gingivall...
Lower first molar bracket
positioning
Occlusal interferences can be a
problem in some cases.

A lower second molar tube ca...
Bracket Placement Gauge

www.indiandentalacademy.com
www.indiandentalacademy.com
www.indiandentalacademy.com
Arch form considerations for
stability and esthetics.
• Bonwill and Hawley in 1905,suggested the
geometric method of const...
• In 1907 Angle- The form of line from the premolars and

molars should resemble a parabolic curve.
-He proposed the need ...
• In 1963 Boone –
-Superimposed Bonwill-Hawley arch form on a
millimeter grid and used Angles method for construction.
-Th...
Traditional edgewise
wire bending and
Boone arch form.

www.indiandentalacademy.com
• The Catenary curve is
formed by extending a
chain from two fixed
points.
• Many of the tapered
arch forms provided
by or...
Brader Archform

www.indiandentalacademy.com
Relapse tendency after changing
arch form.
• Riedel in 1969,postulated that arch form, in the
mandibular arch,cannot be pe...
The four components of archform
i.

ii.

ANTERIOR CURVATURE
Based on inter-canine width. Its shape
becomes more tapered wh...
•

POSTERIOR CURVATURE
In the posterior area a gradual curvature between
canine and second molars are preferred.

•

INTER...
MBT ARCH FORM
• The three basic arch forms are tapered,
square and ovoid.
• When superimposed they vary mainly in
inter-ca...
THE TAPERED ARCH FORM
• Indicated for patients with narrow ,tapered
arch form and gingival recession in canine
and premola...
THE SQUARE ARCH FORM
• Indicated in cases with broad arch form.
• Cases that require buccal uprighting of the
lower poster...
THE OVOID ARCH FORM
• It is the most preferred arch form. The ovoid arch
form has proved to be good, reliable arch form fo...
ARCH FORMS - MBT

www.indiandentalacademy.com
Selection of Archform
i. Arch form template are placed on lower
study models.
-The inter-canine width is evaluated.
ii.If ...
In 70% of cases buccal uprighting will result in
lower anterior relapse.
Cases in which buccal uprighting will be stable
i...
Arch wire Sequencing
 EARLY IN TREATMENT .015”/ .0175” multistranded /.014” SS
OR
.016” HANT. Less effect on arch form , ...
Archwire Coordination
• It is important throughout treatment.
• Most critical with heavier round wires and .
019x.025 SS.
...
SLIDING MECHANICS
Passive tiebacks.

Type 1 active tiebacks

www.indiandentalacademy.com
SLIDING MECHANICS
Type 2 active tieback.

Type 3 active tieback.

www.indiandentalacademy.com
ARCH WIRE WITH
SOLDERED HOOKS

www.indiandentalacademy.com
Arch form during finishing and
detailing
• Phase of settling is preferred with lighter wires.
-Lower arch- .014”SS or .016...
EXCLUSIVE MBT
APPLIANCE FEATURES.
•
•
•
•

Reduced anterior tip.
Upper bicuspid brackets with 00 tip.
Lower bicuspid brack...
• Upper molar brackets with additional 50 buccal
root torque.
• Progressive buccal crown torque in lower cuspids
and lower...
www.indiandentalacademy.com
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MBT Technique /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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Transcript of "MBT Technique /certified fixed orthodontic courses by Indian dental academy "

  1. 1. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. The MBT Bracket System • The MBT bracket system is based on a more balanced mix of science,tradition and experience. • It is a bracket system for use with light continuous forces, lacebacks and bendbacks • It is designed ideally to work with sliding mechanics. www.indiandentalacademy.com
  3. 3. Requirements for Providing Quality Orthodontic Care • Good diagnosis and treatment planning. • Best available bracket system. • Correct positioning and repositioning of brackets. • Clear philosophy on arch form. • Effective aligning technique. www.indiandentalacademy.com
  4. 4. • Ability to level the dental arches and control overbite. • Correction of Class II and Class III discrepancies . • Controlled space closure, with sliding mechanics. • Persistence in finishing. • Good retention protocol. www.indiandentalacademy.com
  5. 5. Diagnosis and treatment planning -The Dental VTO DENTAL VTO provides organized and simplified information about direction and amount of dental movement in UL arches. The information includes,the initial position and desired movement of first molars ,the cuspids and the dental midlines. It is helpful in extraction and non-extraction decision and can be referred during regular follow-up. www.indiandentalacademy.com
  6. 6. INITIAL MIDLINE AND MOLAR POSITION Right Left Midline Molars Chart 1 www.indiandentalacademy.com
  7. 7. LOWER ARCH DISCREPANCY Right Crowding Left 3x3 6x6 Protrusion Curve of Spee Midline Total 3x3 6x6 Chart 2 www.indiandentalacademy.com
  8. 8. Secondary factors to provide additional space. • Interproximal enamel reduction. • Uprighting or distal movement of lower first molars. • Buccal uprighting of lower canines and lower posterior teeth. • Leeway space or ‘E’space. www.indiandentalacademy.com
  9. 9. ANTICIPATED TREATMENT CHANGE Right Left Midline Cuspids 1st Molars Chart-3 www.indiandentalacademy.com
  10. 10. Case - 1 • • • • • • • • • 12 year old male patient. Class II skeletal pattern. High angle with increased lower facial height 4mm Class II on right side. 3.5mm Class II on left side. Lower midline deviated 1mm to right. 4mm lower incisor crowding. 2mm Curve of Spee. Lower anteriors 6mm in front of A.pog line. www.indiandentalacademy.com
  11. 11. INITIAL MIDLINE AND MOLAR POSITION Right Left 4mm 3.5mm 1mm Chart-1 www.indiandentalacademy.com
  12. 12. LOWER ARCH DISCREPANCY 3x3 Right -3 Left -1 6x6 -3 -1 Protrusion -2 -2 Curve of Spee -1 -1 Midline +1 -1 3x3 -5 -5 Crowding Total 6x6 Chart 2 -5 -5 www.indiandentalacademy.com
  13. 13. ANTICIPATED TREATMENT CHANGE Right Left 2mm 9mm 0 8.5mm 1.5mm (7) (7) 2mm (7) (7) 5mm 1mm Chart-3. www.indiandentalacademy.com 5mm 2mm
  14. 14. Bracket Specification THE FIRST GENERATION PAE • The original SWA was introduced by Andrews in 1972 and it had the features of Siamese edgewise bracket. • He recommended a wide range of brackets. - For extraction cases, anti-tip,anti-rotation, and power arms for control space closure. -Three sets of incisor brackets with varying degrees of torque for different clinical situation. www.indiandentalacademy.com
  15. 15. THE SECOND GENERATION PEA • To avoid inventory difficulties or multiple bracket system, ROTH recommended a single appliance system to manage both extraction and non-extraction cases. • The appliance prescriptions developed by Andrews and Roth were based on the treatment mechanics used in their practice. www.indiandentalacademy.com
  16. 16. THE THIRD GENERATION PEA • The MBT has been developed from the combined clinical experience of the authors for more than 70 years. • It also introduced additional research input from Japanese sources to update the scientific input. • It is designed ideally to work with sliding mechanics,with light continuous forces, lacebacks and bendbacks. www.indiandentalacademy.com
  17. 17. The MBT Versatile Appliance System. Victory Series Brackets. Unitek Full-Sized Twin Brackets. Clarity Brackets. Molar bands,molar bonding bases,and buccal tubes. www.indiandentalacademy.com
  18. 18. Design features of a modern bracket system • Range of brackets - Standard size metal brackets. - Mid-size metal brackets. -Esthetic brackets. • Improved i.d system Laser numbering of standard size metal brackets. • Rhomboidal shape Reduces bulk and assists accuracy of bracket placement. www.indiandentalacademy.com
  19. 19. • Torque in base-the CAD factor Using CAD it is possible to program the computer to create the correct relationship between the mid-point on the tooth and the slot base,as with traditional torque-in-base. • Refinement of bracket base design It is incorporated to increase strength and help plaque control in difficult areas. www.indiandentalacademy.com
  20. 20. • Drawing of original SWA bracket. • Dots (upper) and dashes (lower) were used for i.d purposes. www.indiandentalacademy.com
  21. 21. • Drawing of MBT brackets. • Standard size brackets have a rhomboidal form and numerical i.d.system. www.indiandentalacademy.com
  22. 22. • Lower premolar bracket may be offset on specially designed bases,to increase bond strength and reduce the risk of bond failure. www.indiandentalacademy.com
  23. 23. • Tapered bracket bases on lower incisors can help in plaque control in this difficult area. www.indiandentalacademy.com
  24. 24. Tip specification ANTERIOR TIP Reduced anterior tip was incorporated into the appliance to conform to Andrews original research,and to dramatically reduce the anchorage needs of each case. www.indiandentalacademy.com
  25. 25. Incisor Tip Cuspid Tip Upper Central Upper Lateral Lower Central Lower Lateral Upper Lower MBT Versatile+ 4.0° 8.0° 0° 0° 8.0° 3.0° Original SWA3 5.0° 9.0° 2.0° 2.0° 11.0° 5.0° www.indiandentalacademy.com
  26. 26. UPPER POSTERIOR TIP •Upper bicuspid brackets are provided with 00 tip to keep these teeth in a more upright position . •Upper molar brackets are provided with 00 tip, which when placed parallel to the occlusal plane,introduces 50 tip into the upper molars. www.indiandentalacademy.com
  27. 27. Bicuspid Tip Molar Tip Upper First Upper Second Upper First Upper Second MBT Versatile+ 0° 0° 0° 0° Original SWA 2.0° 2.0° 5.0° 5.0° www.indiandentalacademy.com
  28. 28. Upper tip considerations The authors prefer a 00 tip bracket,with the band seated parallel to the buccal cusps.This gives 50 tip. If a 50 bracket is used,the band must be seated more gingivally at the mesial. If a 50 bracket is used,and the band is seated parallel to the buccal cusps,this will result in an effective 100 tip on the molar. www.indiandentalacademy.com
  29. 29. LOWER POSTERIOR TIP •Lower posterior tip in the first and second bicuspid brackets is maintained at 20, to slightly incline these teeth forward. •For the lower first and second molars, 00 tipped brackets are provided, which when placed parallel to the occlusal plane,introduces 20 of tip to these teeth. www.indiandentalacademy.com
  30. 30. Lower Bicuspid Tip Lower Molar Tip Lower First Lower Second Lower First Lower Second MBT Versatile+ 2.0° 2.0° 0° 0° Original SWA 2.0° 2.0° 2.0° 2.0° www.indiandentalacademy.com
  31. 31. Torque specification INCISOR TORQUE •Upper incisor brackets are provided with additional palatal root torque;while lower incisor brackets are provided with additional labial root torque. •This adjustment aids in the correction of the most common torque problems occurring in the incisor areas. www.indiandentalacademy.com
  32. 32. Upper central incisor torque • Increased palatal root torque for upper centrals. www.indiandentalacademy.com
  33. 33. Upper lateral incisor torque • Increased palatal root torque for upper lateral incisors. www.indiandentalacademy.com
  34. 34. Lower incisor torque • Increased labial root torque for lower incisors. www.indiandentalacademy.com
  35. 35. Incisor Torque Incisor Torque Upper Central Upper Lateral Lower Central Lower Lateral MBT Versatile+ 17.0° 10.0° -6.0° -6.0° Original SWA 7.0° 3.0° -1.0° -1.0° www.indiandentalacademy.com
  36. 36. Upper Cuspid ,bicuspid and molar torque. •Upper cuspid and bicuspid brackets are provided with the normal -70 of torque. •Upper molar brackets are provided with an additional 50 of buccal root torque (-90 to -140 ) to reduce palatal cusp interferences with these teeth. www.indiandentalacademy.com
  37. 37. • Upper canine torque. • Available in –70 ,00 , +70 , torque. • The 00 and +70 options are for cases with narrow maxillary bone form andor prominent canine roots,and are often used with archwires in the tapered form. www.indiandentalacademy.com
  38. 38. Upper torque considerations There was a tendency for upper first molar palatal cusps to extrude. In some cases it is necessary to add buccal root torque to the upper archwire ,even when using a –140 torque bracket. A bracket with – 140 of buccal torque gives extra control. www.indiandentalacademy.com
  39. 39. Upper Cuspid, Bicuspid and Molar Torque Upper Cuspids Upper 1st Bicuspids Upper 2nd Bicuspids Upper 1st Molars Upper 2nd Molars MBT Versatile+ -7.0 -7.0 -7.0 -14.0 -14.0 Original SWA -7.0 -7.0 -7.0 -9.0 -9.0 www.indiandentalacademy.com
  40. 40. Lower cuspid,bicuspid and molar torque. •Progressive buccal crown torque is provided in the brackets of the lower posterior segments. •This allows for buccal uprighting of these teeth,which is beneficial in most cases. www.indiandentalacademy.com
  41. 41. • Lower canine torque available in –60 ,00 ,+60 , • The 00 and +60 options are for cases with narrow mandibular bone form or prominent canine roots,or deep bites at start of treatment. www.indiandentalacademy.com
  42. 42. Lower Cuspid, Bicuspid and Molar Torque Lower Cuspids Lower 1st Bicuspids Lower 2nd Bicuspids Lower 1st Molars Lower 2nd Molars MBT Versatile+ -6.0 -12.0 -17.0 -20.0 -10.0 Original SWA -11.0 -17.0 -22.0 -30.0 -35.0 www.indiandentalacademy.com
  43. 43. In-out specification • It is 100% fully expressed. • In upper premolars an alternative bracket which is 0.5mm thicker than normal,is used. • This is helpful in obtaining good alignment of marginal ridges in cases with small upper second premolars. www.indiandentalacademy.com
  44. 44. In-out modifications. • An upper second bicuspid bracket with an additional 0.5mm of in-out compensation is provided for the common situation in which upper second bicuspids are smaller than upper first bicuspids. www.indiandentalacademy.com
  45. 45. Horizontal bracket placement errors • If brackets are placed to the mesial or distal of the vertical long axis of the clinical crown,improper tooth rotation can occur. www.indiandentalacademy.com
  46. 46. Axial or paralleling bracket placement errors • These will occur if the bracket wings do not straddle the vertical long axis of the crown in a parallel manner. • Such errors lead to improper crown tip. www.indiandentalacademy.com
  47. 47. Thickness errors. • Excess bonding agent beneath the bracket base can cause thickness and rotational errors. • Can be eliminated by pressing the bracket against the tooth. www.indiandentalacademy.com
  48. 48. Vertical errors • Vertical errors in bracket placement are caused by placing brackets gingival or incisalocclusal to the center of the clinical crown. www.indiandentalacademy.com
  49. 49. Gingival Concern. • Partially erupted tooth. • It is difficult to visualize the center of the clinical crown on partially erupted teeth,when treating young patients. www.indiandentalacademy.com
  50. 50. Gingival Inflammation Gingival inflammation causes foreshortening,effectively reducing the length of the clinical crowns. • Top:Healthy gingivae. • Bottom :The same case with inflamed gingivae in the upper right quadrant. www.indiandentalacademy.com
  51. 51. Teeth with palatally or lingually displaced roots. • Individual teeth with lingually displaced roots can produce short clinical crowns. www.indiandentalacademy.com
  52. 52. Teeth with facially displaced roots. • Individual teeth with facially displaced roots can produce long clinical crowns. www.indiandentalacademy.com
  53. 53. Incisal or Occlusal concerns. • Incisal crown fractures or tooth wear make it difficult to visualize the center of the clinical crown. www.indiandentalacademy.com
  54. 54. Crowns with long tapered buccal cusps • Cuspids with tapered clinical crowns often do not have adequate contact with the opposing teeth. www.indiandentalacademy.com
  55. 55. Axial/paralleling variation The tip position of the lateral incisor brackets was varied to help root paralleling. In this case a lower incisor has been extracted and root paralleling has been helped by changing axial positions of adjacent brackets. www.indiandentalacademy.com
  56. 56. Palatally positioned lateral incisors. It is important to create adequate space before attempting to move palatally placed incisors. It is beneficial to invert the bracket on instanding lateral incisors,giving –100 torque. www.indiandentalacademy.com
  57. 57. Upper first molar bracket positioning. Correct position. Band is seated more gingivally at the mesial when treating Class II molar relationship. It is common error to allow the band to seat too gingivally at the distal,causing excessive www.indiandentalacademy.com crown tip.
  58. 58. Lower first molar bracket positioning. Correct band positioning. A common error is to allow the band to seat too gingivally at the mesial . www.indiandentalacademy.com
  59. 59. Lower first molar bracket positioning Occlusal interferences can be a problem in some cases. A lower second molar tube can be used on lower first molars to avoid interferences in some cases. www.indiandentalacademy.com
  60. 60. Bracket Placement Gauge www.indiandentalacademy.com
  61. 61. www.indiandentalacademy.com
  62. 62. www.indiandentalacademy.com
  63. 63. Arch form considerations for stability and esthetics. • Bonwill and Hawley in 1905,suggested the geometric method of constructing the ideal arch form. - The lower six anterior teeth lie along a circle whose radius equaled their combined widths. -From this circle an equilateral triangle is created,the base of which represented the condylar width. -Premolars and molars should lie along these extended lines. www.indiandentalacademy.com
  64. 64. • In 1907 Angle- The form of line from the premolars and molars should resemble a parabolic curve. -He proposed the need for natural curvature in molar region. • In 1934 Chuck-Noted variation in arch form –square, oval, tapering. -The premolar region should be wider than canines to prevent excessive expansion of the canines. www.indiandentalacademy.com
  65. 65. • In 1963 Boone – -Superimposed Bonwill-Hawley arch form on a millimeter grid and used Angles method for construction. -Thus Bonwill-Hawley arch form is used as a template in edgewise. • Braun et al,1998 -Reported that the human arch form could be represented by a complex mathematical formula,known as the Beta function. -This was calculated by entering measurements of dental landmarks on orthodontic models into a computer curve-fitting program. www.indiandentalacademy.com
  66. 66. Traditional edgewise wire bending and Boone arch form. www.indiandentalacademy.com
  67. 67. • The Catenary curve is formed by extending a chain from two fixed points. • Many of the tapered arch forms provided by orthodontic manufactures today are based on Catenary curve. www.indiandentalacademy.com
  68. 68. Brader Archform www.indiandentalacademy.com
  69. 69. Relapse tendency after changing arch form. • Riedel in 1969,postulated that arch form, in the mandibular arch,cannot be permanently altered during appliance therapy. • Similar research was done by Shapiro, Gardner, Felton,De La Cruz and Burke suggesting that changes in inter-molar width seem to be more stable than those of inter-canine width. www.indiandentalacademy.com
  70. 70. The four components of archform i. ii. ANTERIOR CURVATURE Based on inter-canine width. Its shape becomes more tapered when inter-canine width is narrow and more square when inter-canine width is wide. INTER-CANINE WIDTH This appears to be the most critical aspect of arch form,because significant relapse occurs if this dimension is changed. www.indiandentalacademy.com
  71. 71. • POSTERIOR CURVATURE In the posterior area a gradual curvature between canine and second molars are preferred. • INTER-MOLAR WIDTH Treatment changes in this dimension is more stable. Arch form in the inter-molar region can be widened or narrowed,depending on the needs of the case. www.indiandentalacademy.com
  72. 72. MBT ARCH FORM • The three basic arch forms are tapered, square and ovoid. • When superimposed they vary mainly in inter-canine width,giving a range of approximately 6mm. • Inter-molar widths are similar ,but the molar areas can be widened or narrowed as needed,by easy wire bending. www.indiandentalacademy.com
  73. 73. THE TAPERED ARCH FORM • Indicated for patients with narrow ,tapered arch form and gingival recession in canine and premolar regions. • Cases undergoing single arch treatment,in this way no expansion of treated arch occurs. www.indiandentalacademy.com
  74. 74. THE SQUARE ARCH FORM • Indicated in cases with broad arch form. • Cases that require buccal uprighting of the lower posterior segments and expansion of the upper arch. • After over-expansion has been achieved ,it may be beneficial to change to the ovoid arch form in the later stages of treatment. www.indiandentalacademy.com
  75. 75. THE OVOID ARCH FORM • It is the most preferred arch form. The ovoid arch form has proved to be good, reliable arch form for high percentage of cases treated with PAE • Treated cases have shown good stability, with minimal amounts of post-treatment relapse. www.indiandentalacademy.com
  76. 76. ARCH FORMS - MBT www.indiandentalacademy.com
  77. 77. Selection of Archform i. Arch form template are placed on lower study models. -The inter-canine width is evaluated. ii.If buccal uprighting is needed in the lower arch, a wider arch form is selected. www.indiandentalacademy.com
  78. 78. In 70% of cases buccal uprighting will result in lower anterior relapse. Cases in which buccal uprighting will be stable include(a) Cases in which maxillary expansion is indicated. (b)Deep bite cases such as Class II /2 cases. iii.Contour and width in the lower posterior segment is estimated but this can be easily customized. www.indiandentalacademy.com
  79. 79. Arch wire Sequencing  EARLY IN TREATMENT .015”/ .0175” multistranded /.014” SS OR .016” HANT. Less effect on arch form , so ovoid arch form indicated for all cases.  MID TREATMENT – .014”/.016”/.018” SS OR .019x.025” Rec. HANT. Influence arch form –requires full inventory.  LATE TREATMENT.019x.025”SS – stocks of three arch forms. www.indiandentalacademy.com
  80. 80. Archwire Coordination • It is important throughout treatment. • Most critical with heavier round wires and . 019x.025 SS. • Arch form templates can be used for coordination. • The upper wire should superimpose approximately 3mm outside lower wire. • This is representative of overlap of the upper teeth relative to the lower teeth. www.indiandentalacademy.com
  81. 81. SLIDING MECHANICS Passive tiebacks. Type 1 active tiebacks www.indiandentalacademy.com
  82. 82. SLIDING MECHANICS Type 2 active tieback. Type 3 active tieback. www.indiandentalacademy.com
  83. 83. ARCH WIRE WITH SOLDERED HOOKS www.indiandentalacademy.com
  84. 84. Arch form during finishing and detailing • Phase of settling is preferred with lighter wires. -Lower arch- .014”SS or .016” NiTi - Upper arch- .014”SS sect.,with light triangular elastics. • Teeth adjacent to extraction sites lightly tied together. • An upper removable plate is required to maintain maxillary expansion. • In Class II/1 cases to prevent overjet relapse, a full .014”SS arch wire with bendbacks is advocated. www.indiandentalacademy.com
  85. 85. EXCLUSIVE MBT APPLIANCE FEATURES. • • • • Reduced anterior tip. Upper bicuspid brackets with 00 tip. Lower bicuspid brackets with 20 tip. Additional palatal root torque for upper incisors and additional labial root torque for lower incisors. • Upper cuspid brackets with the normal –7 0 torque or 00 torque. www.indiandentalacademy.com
  86. 86. • Upper molar brackets with additional 50 buccal root torque. • Progressive buccal crown torque in lower cuspids and lower buccal segments. • Optional upper second bicuspid brackets with an additional 0.5mm of in-out compensation. • Three bracket types,Clarity Aesthetic Brackets, Victory Series brackets, and Unitek Full Size Twin Brackets,all available with APC Adhesive Coating. www.indiandentalacademy.com
  87. 87. www.indiandentalacademy.com

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