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

www.indiandentalacad...
CONTENTS

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INTRODUCTION
HISTORY
TYPES OF HEADGEAR
USES OF HEADGEAR
HEADGEAR ASSEMBLY
SELECTION OF CASE...
HISTORY

Kingsley – late 1800’s

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HISTORY

Ball joint

Angle’s E- arch appliance, Early-1900’s
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EFFECT OF CLASS II ELASTICS

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HISTORY

Silas Kloehn, after World War II

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PRESENT DAY

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HEADGEAR ASSEMBLY
Head

cap
Cervical strap
Face bow components
 Outer

bow (.051” or .062”)
 Inner bow (.045” or .052...
HEAD CAP

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HEAD CAP

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NECK STRAP

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MOLAR BAND

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MOLAR TUBE -OCCLUSAL

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MOLAR TUBE GINGIVAL

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TRACTION RELEASE FORCE
MODULES

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TYPE OF OUTER BOW

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FACE BOW JUNCTIONS (Dougherty and
Beazley AJO, Nov 1976)

Brazed / soldered joints

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FACE BOW JUNCTIONS

Parallel pin-and-tube
attachment

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FACE BOW JUNCTIONS

Tongue- and-groove
attachment

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FACE BOW JUNCTIONS

Key-and-slot
design

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MODE OF ATTACHMENT TO
DENTITION


Headgear tubes on 1st molars



Maxillary splint



Functional appliance



J- hooks...
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INDICATIONS
 Growing

individuals
 Class II Div 1 malocclusion

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TYPES OF HEADGEAR
 Occipital

/ High pull head gear
 Cervical / Low pull head gear
 Vertical pull headgear
 Combined O...
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KLOHEN FACEBOW

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RAMPTON FACE BOW

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ROOT HIGH PULL FACE BOW

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Occipital / High pull headgear

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Cervical / Low pull Headgear

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Combination / Straight pull

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Vertical pull headgear

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Interlandi / Variable pull headgear

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HIGH PULL HEADGEAR WITH J HOOK

J
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HORIZONTAL PULL HEADGEAR

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 PROTACTION

HEAD GEAR
 REVERSE PULL HEAD GEAR- FOR
TREATMENT OF CLASS III

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ASSYMETRIC HEAD GEAR

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TYPES OF FACE BOWS (Hershey,
AJO-DO Mar 1981)
 Bilaterally

symmetrical face bow
 Power-arm unilateral face bow
 Solder...
BILATERALLY SYMMETRICAL
FACE BOW

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POWER-ARM UNILATERAL FACE
BOW

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SOLDERED OFFSET OR FIXED
UNION UNILATERAL FACE BOW

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SWIVEL OFFSET OR SWIVEL UNION
UNILATERAL FACE BOW

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SPRING ATTACHMENT UNILATERAL
FACE BOW

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USES OF HEADGEAR
Growth

modification
Anchorage augmentation
Space maintenance
Molar distalization

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APPLICATIONS OF HEADGEAR
 ORTHOPAEDIC

Restriction of maxilla
 Distalization of maxilla
 Intrusion of maxilla


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GROWTH MODIFICATION
 TREATMENT

OF CLASS II

 RANDOMISED

CLINICAL TRIALS OF 1990s
DATA Shows that functional appliance ...
 IN

Case of 2 phase treatment headgear is
compatible with fixed appliance

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SHORT FACE (SKELETAL DEEP BITE )
CLASS II
 The

additional goals are
-block eruption of incisor teeth
-control eruption o...
 Cervical

headgear are used in deep bite
cases ,it differentially allow eruption of upper
first molar rather than lower
...
Class II CHILDEREN WITH NORMAL
FACE HIEGHT
 Either

headgear or any type of functional
appliance is acceptable

 Straigh...
 Functional

appliance that minimize tooth
movement are preffered to obtain maximum
skeletal effect

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Long face (skeletal open bite class II)
 Major
-

diagonostic criteria
Short ramus
Rotation of the palatal plane up poste...
 Keys

to successful growth modification would
be restraining vertical development and
encouraging anterioposterior mandi...
HIERECHERY OF EFFECTIVENESS IN
LONG FACE CLASS II TREATMENT
 HP

headgear to functional bite blocks

 Bite

blocks on fu...
HIGHPULL TO
M.I.S
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EFFECT ON MAXILLA
 It

should be worn 12-14 hrs day
 Current recommendation of force -12-16
ounce side (350-450gm side d...
Force prescription
 Force

of 500 -1000 gm total
 Force direction slightly above the occlusal p
lane –through the centre...
Correction of molar relationship
 To

change end –to – end molar relation to
class I
 More the child wear the headgear i...
For anchorage reinforcement
 Ratio

of pdl between anchorage unit and
tooth moving unit is
2:1 without friction
4:1 with ...
APPLICATIONS OF HEADGEAR


ANCHORAGE AUGMENTATION (with intraoral
mechanics)

Closure of 1st
premolar Xn
space
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By pass arch for levelling by intrusion
 High

pull headgear to the upper molars can
be added with any of bypass arch sys...
Canine retraction
 Avoid

strain on posterior teeth

 Disadvantage-

heavy and intermittent force
more friction may caus...
 CAN

BE USED FOR DISTALIZATION OF
FIRST MOLAR AFTER SECOND MOLAR
EXTRACTION
 STRAIGHT PULL OR HIGH PULL
HEADGEAR IS IND...
Retention after class II MOLAR
CORRECTION
 OVER

CORRECTION OF OCCLUSAL
RELATIONSHIP
 CONTINUE NIGHT TIME WEAR OF
HEADGE...
APPLICATIONS OF HEADGEAR
 TOOTH

MOVEMENTS
 Molar distalization
•
•

 Distal

Bilateral
Unilateral

molar crown tipping...
APPLICATIONS OF HEADGEAR
 SPACE

MAINTANENCE
 SPACE REGAINER

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SELECTION OF CASES



3 major decisions
LOCATION OF THE HEADGEAR

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FORCE PRESCRIPTION
 RESTRICTION





OF MAXILLA
250-500 grams/side
Worn atleast 12 hrs/day
Early in the evening till ...
 END





TO END MOLARS -> CLASS I
100 grams/side
Moderate intensity, longer duration
14-16 hrs/day
1 mm movement/mon...
 FIRST



MOLAR DITALIZATION FOLLOWING

7 Xn
300 grams/side
Full time wear

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 CANINE


RETRACTION
200 grams/side

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Longer bow bent up or short
outer bow bent down will
produce same line of action

HIGH PULL

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CERVICAL PULL

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COMBI-PULL

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CLINICAL PROCEDURES






MOLAR BANDING
WITH TUBES
PREFORMED FACE
BOWS WITH
ADJUSTMENT LOOPS
IN INNER BOW
CHECK THE SIZ...
CLINICAL PROCEDURES




PLACE IT INTO ONE
TUBE AND EXAMINE
ITS RELATION TO
THE OTHER TUBE
KEEP IT 3-4 mm
AWAY FROM THE
T...
CLINICAL PROCEDURES







INNER BOW MUST BE
PASSIVE IN THE MOLAR
TUBE
END SHOULD BE FLUSH
WITH TUBE OR NOT
MORE THAN 1...




AS MANDIBULAR
ADVANCEMENT
TAKES PLACE THE
I.B. SHOULD BE
EXPANDED
EXPANSION OF 2MM

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



O.B. SHOULD BE
KEPT AWAY FROM
CHEEKS
CUT TO PROPER
LENGTH AND HOOKS
FORMED

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 SELECTION

OF HEADCAP AND/OR
NECKSTRAP
 LOW FORCE LEVELS TO START WITH
 RECHECK BOW POSITION
 MAKE CHILD MANIPULATE U...
BIOMECHANICS
 Definition

of terms

FORCE
A force is that which changes or tends to
change the position of rest of a body...



Definition of terms
CENTER OF MASS

A FREE BODY IN SPACE HAS A SINGLE
POINT WHERE ALL ITS MASS IS
CENTERED. WHEN A FO...
CENTER OF RESISTANCE
THE ANALOGOUS CENTER OF MASS OF A
RESTRAINED BODY e.g. A TOOTH
SUPPORTED BY ALVEOLAR BONE IS
CALLED C...
 Or
 Is

that point through which the resultant of
constraining forces acting upon it may be
considered to act
 Or a po...
CENTER (C
Res) OF
RESISTANCE
OF MAXILLARY
MOLAR
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CENTER OF
RESISTANCE www.indiandentalacademy.com
CENTER OR
RESISTANCE
(C Res) OF
MAXILLA
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 Definition

of terms
 CENTER OF ROTATION
It is an arbitary point about which a body
appears to have rotated as determin...
MOMENT OF A FORCE
Defined as the product of force times the
perpendicular distance from the point of force
application to ...
MOMENT = FORCE X PERENDICULAR DISTENCE
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TOOTH MOVEMENTS RESULTING FROM FORCES
NOT ACTING THROUGH THE CRes IS A
COMBINATION OF ROTATION AND TRANSLATION
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 Definition

of terms

COUPLE
Two non-collinear forces equal in magnitude
and opposite in direction.
Application of a cou...
MOMENT OF A COUPLE
Tendency to rotate when a couple is applied.


Moment of couple= one of the forces of couple
X perendi...
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LINE OF ACTION
 Line

of action of a force is that line
connecting the point of origin of force ( head
cap or neck) to th...
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 The

line of action depend on the point of
attachment (hook on the outer bow)

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Teeth can be moved in 3 planes


Sagittal plane



Coronal plane



Transverse plane

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Sagittal plane
 point

of attachment (outer bow hook)can
be anywhere on the line a-p axis ,V-Vi
axis in the saggital rect...
V
P

A
Vi
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Shape of outer bow is of no
consequence

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Point of attachment can be varied by
 Varying

the length of outer bow

 Varying

the angle between inner and outer

bow...
Cervical headgear for bodily
movement

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Location of point of attachment

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Distal force component
 Distal

force is maximum when line of action
is horizontal,rather than inclined, and passes
throu...
Minimal inclined line of action

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Steep line of action

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Coronal plane
 The

magnitude of the intrusive or extrusive
vertical component is dependent upon the
inclination or steep...
 Since

line of action passes bucally during
intrusion or extrusion these teeth will tend to
roll.
 Buccal crown movemen...
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Palatal bar for bodily intrusion

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Transverse plane
 Tooth

can be moved distally and medially or
laterally



expansion or contraction of inner arch of
fa...
Lateral forces on molar during
extraoral force application


Lateral forces in case of
symmetrical face bow

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Offset joint in face bow

70

18

16

14

16

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 This

difference is due to flexibility of arm and
not due to offset joint

 If


outer bow is rigid force will be same...
Symmetrical soldered outerbow with
different arm length

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 In

clinical practice lengthening one arm or
bending it out will create more distal force on
that side
 A mild expansio...
Swivel type of unilateral extraoral face
bow


Most suitable without
any lateral force

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HEADGEARS IN COMBINATION
THERAPY
 FUNCTIONAL

APPLIANCE
 EXTRAORAL FORCE
 CLASS II DIV I CASES WITH
 More excessive ve...
 ACTIVATOR

WITH HEADGEAR
 Hasund (1969)
 Stockfisch (1977)
 Stockli (1982)
 Pfeiffer (1984)
 Grobety (1984)

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PFEIFFER-GROBETY TECHNIQUE

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STOCKLI-TEUSCHER APPLIANCE

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HEADGEAR WITH BIONATOR

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

FRANKEL APPLIANCE
WITH HEADGEAR

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Thank you
For more details please visit
www.indiandentalacademy.com

www.indiandentalacademy.com
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The headgear /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 "The headgear /certified fixed orthodontic courses by Indian dental academy "

  1. 1. THE HEADGEAR INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  2. 2. CONTENTS           INTRODUCTION HISTORY TYPES OF HEADGEAR USES OF HEADGEAR HEADGEAR ASSEMBLY SELECTION OF CASES CLINICAL PROCEDURES BIOMECHANICS & FORCE PRESCRIPTION HEAD GEARS IN COMBINATION THERAPY CONCLUSION www.indiandentalacademy.com
  3. 3. HISTORY Kingsley – late 1800’s www.indiandentalacademy.com
  4. 4. HISTORY Ball joint Angle’s E- arch appliance, Early-1900’s www.indiandentalacademy.com
  5. 5. EFFECT OF CLASS II ELASTICS www.indiandentalacademy.com
  6. 6. HISTORY Silas Kloehn, after World War II www.indiandentalacademy.com
  7. 7. PRESENT DAY www.indiandentalacademy.com
  8. 8. HEADGEAR ASSEMBLY Head cap Cervical strap Face bow components  Outer bow (.051” or .062”)  Inner bow (.045” or .052”) Molar bands and headgear tubes Force element www.indiandentalacademy.com
  9. 9. HEAD CAP www.indiandentalacademy.com
  10. 10. HEAD CAP www.indiandentalacademy.com
  11. 11. NECK STRAP www.indiandentalacademy.com
  12. 12. MOLAR BAND www.indiandentalacademy.com
  13. 13. MOLAR TUBE -OCCLUSAL www.indiandentalacademy.com
  14. 14. MOLAR TUBE GINGIVAL www.indiandentalacademy.com
  15. 15. TRACTION RELEASE FORCE MODULES www.indiandentalacademy.com
  16. 16. TYPE OF OUTER BOW www.indiandentalacademy.com
  17. 17. FACE BOW JUNCTIONS (Dougherty and Beazley AJO, Nov 1976) Brazed / soldered joints www.indiandentalacademy.com
  18. 18. FACE BOW JUNCTIONS Parallel pin-and-tube attachment www.indiandentalacademy.com
  19. 19. FACE BOW JUNCTIONS Tongue- and-groove attachment www.indiandentalacademy.com
  20. 20. FACE BOW JUNCTIONS Key-and-slot design www.indiandentalacademy.com
  21. 21. MODE OF ATTACHMENT TO DENTITION  Headgear tubes on 1st molars  Maxillary splint  Functional appliance  J- hooks attached to archwire www.indiandentalacademy.com
  22. 22. www.indiandentalacademy.com
  23. 23. INDICATIONS  Growing individuals  Class II Div 1 malocclusion www.indiandentalacademy.com
  24. 24. TYPES OF HEADGEAR  Occipital / High pull head gear  Cervical / Low pull head gear  Vertical pull headgear  Combined Occipital & Cervical / Straight pull headgear  Interlandi / Variable pull headgear www.indiandentalacademy.com
  25. 25. www.indiandentalacademy.com
  26. 26. www.indiandentalacademy.com
  27. 27. KLOHEN FACEBOW www.indiandentalacademy.com
  28. 28. RAMPTON FACE BOW www.indiandentalacademy.com
  29. 29. ROOT HIGH PULL FACE BOW www.indiandentalacademy.com
  30. 30. Occipital / High pull headgear www.indiandentalacademy.com
  31. 31. Cervical / Low pull Headgear www.indiandentalacademy.com
  32. 32. Combination / Straight pull www.indiandentalacademy.com
  33. 33. Vertical pull headgear www.indiandentalacademy.com
  34. 34. Interlandi / Variable pull headgear www.indiandentalacademy.com
  35. 35. HIGH PULL HEADGEAR WITH J HOOK J www.indiandentalacademy.com
  36. 36. HORIZONTAL PULL HEADGEAR www.indiandentalacademy.com
  37. 37.  PROTACTION HEAD GEAR  REVERSE PULL HEAD GEAR- FOR TREATMENT OF CLASS III www.indiandentalacademy.com
  38. 38. ASSYMETRIC HEAD GEAR www.indiandentalacademy.com
  39. 39. TYPES OF FACE BOWS (Hershey, AJO-DO Mar 1981)  Bilaterally symmetrical face bow  Power-arm unilateral face bow  Soldered offset or fixed union unilateral face bow  Swivel offset or swivel union unilateral face bow  Spring attachment unilateral face bow www.indiandentalacademy.com
  40. 40. BILATERALLY SYMMETRICAL FACE BOW www.indiandentalacademy.com
  41. 41. POWER-ARM UNILATERAL FACE BOW www.indiandentalacademy.com
  42. 42. SOLDERED OFFSET OR FIXED UNION UNILATERAL FACE BOW www.indiandentalacademy.com
  43. 43. SWIVEL OFFSET OR SWIVEL UNION UNILATERAL FACE BOW www.indiandentalacademy.com
  44. 44. SPRING ATTACHMENT UNILATERAL FACE BOW www.indiandentalacademy.com
  45. 45. USES OF HEADGEAR Growth modification Anchorage augmentation Space maintenance Molar distalization www.indiandentalacademy.com
  46. 46. APPLICATIONS OF HEADGEAR  ORTHOPAEDIC Restriction of maxilla  Distalization of maxilla  Intrusion of maxilla  www.indiandentalacademy.com
  47. 47. GROWTH MODIFICATION  TREATMENT OF CLASS II  RANDOMISED CLINICAL TRIALS OF 1990s DATA Shows that functional appliance and headgear both shows small but significant improvement in jaw relationship than controls Similar decrease in ANB www.indiandentalacademy.com
  48. 48.  IN Case of 2 phase treatment headgear is compatible with fixed appliance www.indiandentalacademy.com
  49. 49. SHORT FACE (SKELETAL DEEP BITE ) CLASS II  The additional goals are -block eruption of incisor teeth -control eruption of upper posterior teeth -facilitate eruption of lower posterior teeth This pattern of change is produced most effectively with a functional appliance www.indiandentalacademy.com
  50. 50.  Cervical headgear are used in deep bite cases ,it differentially allow eruption of upper first molar rather than lower  Activator and bionator are useful in such type of cases  Fixed functional appliance of the Herbst type tend to depress upper molars ,usually they are not recommended for short face patients www.indiandentalacademy.com
  51. 51. Class II CHILDEREN WITH NORMAL FACE HIEGHT  Either headgear or any type of functional appliance is acceptable  Straight pull or high pull headgear is preffered over cervical headgear ,to reduce elongation of maxillary molars and better control of mandibular plane www.indiandentalacademy.com
  52. 52.  Functional appliance that minimize tooth movement are preffered to obtain maximum skeletal effect www.indiandentalacademy.com
  53. 53. Long face (skeletal open bite class II)  Major - diagonostic criteria Short ramus Rotation of the palatal plane up posteriorly Excessive maxillary posterior growth than anteriorly Downward and backward rotation of mandible Excessive eruption of maxillary and mandibular teeth www.indiandentalacademy.com
  54. 54.  Keys to successful growth modification would be restraining vertical development and encouraging anterioposterior mandibular growth,while controlling eruption of teeth in both jaw www.indiandentalacademy.com
  55. 55. HIERECHERY OF EFFECTIVENESS IN LONG FACE CLASS II TREATMENT  HP headgear to functional bite blocks  Bite blocks on functional appliance  High pull headgear to maxillary splint  High pull headgear to molars www.indiandentalacademy.com
  56. 56. HIGHPULL TO M.I.S www.indiandentalacademy.com
  57. 57. EFFECT ON MAXILLA  It should be worn 12-14 hrs day  Current recommendation of force -12-16 ounce side (350-450gm side day www.indiandentalacademy.com
  58. 58. Force prescription  Force of 500 -1000 gm total  Force direction slightly above the occlusal p lane –through the centre of resistance of molar teeth  Force duration – at least 12 hours from early evening until next morning  Typical treatment duration -12 -18 months www.indiandentalacademy.com
  59. 59. Correction of molar relationship  To change end –to – end molar relation to class I  More the child wear the headgear is better  14- 16 hrs day  100 gm side  Tooth movement 1mm month  3 mm movement in 3 months www.indiandentalacademy.com
  60. 60. For anchorage reinforcement  Ratio of pdl between anchorage unit and tooth moving unit is 2:1 without friction 4:1 with friction Head gear apply backward force on upper arch The reaction force is disspiated against the bones of cranial vault Problem – intermittent force www.indiandentalacademy.com
  61. 61. APPLICATIONS OF HEADGEAR  ANCHORAGE AUGMENTATION (with intraoral mechanics) Closure of 1st premolar Xn space www.indiandentalacademy.com
  62. 62. By pass arch for levelling by intrusion  High pull headgear to the upper molars can be added with any of bypass arch systems to improve upper posterior anchorage www.indiandentalacademy.com
  63. 63. Canine retraction  Avoid strain on posterior teeth  Disadvantage- heavy and intermittent force more friction may cause assymetric response www.indiandentalacademy.com
  64. 64.  CAN BE USED FOR DISTALIZATION OF FIRST MOLAR AFTER SECOND MOLAR EXTRACTION  STRAIGHT PULL OR HIGH PULL HEADGEAR IS INDICATED  FORCE -300 gm side www.indiandentalacademy.com
  65. 65. Retention after class II MOLAR CORRECTION  OVER CORRECTION OF OCCLUSAL RELATIONSHIP  CONTINUE NIGHT TIME WEAR OF HEADGEAR WITH RETAINER  USE OF ACTIVATOR – BIONATOR TYPE OF FUNCTIONAL APPLIANCE www.indiandentalacademy.com
  66. 66. APPLICATIONS OF HEADGEAR  TOOTH MOVEMENTS  Molar distalization • •  Distal Bilateral Unilateral molar crown tipping  Distal molar root tipping  Molar intrusion  Canine retraction  Retraction of maxillary anteriors  Flattening occlusal plane www.indiandentalacademy.com
  67. 67. APPLICATIONS OF HEADGEAR  SPACE MAINTANENCE  SPACE REGAINER www.indiandentalacademy.com
  68. 68. SELECTION OF CASES   3 major decisions LOCATION OF THE HEADGEAR www.indiandentalacademy.com
  69. 69. FORCE PRESCRIPTION  RESTRICTION     OF MAXILLA 250-500 grams/side Worn atleast 12 hrs/day Early in the evening till next morning 12-18 monthsdepending on growth and patient compliance www.indiandentalacademy.com
  70. 70.  END     TO END MOLARS -> CLASS I 100 grams/side Moderate intensity, longer duration 14-16 hrs/day 1 mm movement/month www.indiandentalacademy.com
  71. 71.  FIRST   MOLAR DITALIZATION FOLLOWING 7 Xn 300 grams/side Full time wear www.indiandentalacademy.com
  72. 72.  CANINE  RETRACTION 200 grams/side www.indiandentalacademy.com
  73. 73. Longer bow bent up or short outer bow bent down will produce same line of action HIGH PULL www.indiandentalacademy.com
  74. 74. CERVICAL PULL www.indiandentalacademy.com
  75. 75. COMBI-PULL www.indiandentalacademy.com
  76. 76. CLINICAL PROCEDURES    MOLAR BANDING WITH TUBES PREFORMED FACE BOWS WITH ADJUSTMENT LOOPS IN INNER BOW CHECK THE SIZE USING PRE Rx CAST www.indiandentalacademy.com
  77. 77. CLINICAL PROCEDURES   PLACE IT INTO ONE TUBE AND EXAMINE ITS RELATION TO THE OTHER TUBE KEEP IT 3-4 mm AWAY FROM THE TEETH www.indiandentalacademy.com
  78. 78. CLINICAL PROCEDURES    INNER BOW MUST BE PASSIVE IN THE MOLAR TUBE END SHOULD BE FLUSH WITH TUBE OR NOT MORE THAN 1 mm Jn OF I.B. & O.B. MUST PASSIVELY REST BETWEEN THE LIPS www.indiandentalacademy.com
  79. 79.   AS MANDIBULAR ADVANCEMENT TAKES PLACE THE I.B. SHOULD BE EXPANDED EXPANSION OF 2MM www.indiandentalacademy.com
  80. 80.   O.B. SHOULD BE KEPT AWAY FROM CHEEKS CUT TO PROPER LENGTH AND HOOKS FORMED www.indiandentalacademy.com
  81. 81.  SELECTION OF HEADCAP AND/OR NECKSTRAP  LOW FORCE LEVELS TO START WITH  RECHECK BOW POSITION  MAKE CHILD MANIPULATE UNDER SUPERVISION  PATIENT INSTRUCTIONS www.indiandentalacademy.com
  82. 82. BIOMECHANICS  Definition of terms FORCE A force is that which changes or tends to change the position of rest of a body or its uniform motion in straight line .  www.indiandentalacademy.com
  83. 83.   Definition of terms CENTER OF MASS A FREE BODY IN SPACE HAS A SINGLE POINT WHERE ALL ITS MASS IS CENTERED. WHEN A FORCE IS APPLIED THROUGH THE C.O.M. IT CAUSES ALL POINTS IN THE BODY TO MOVE THE SAME AMOUNT IN THE SAME DIRECTION AS THE LINE OF FORCE (TRANSLATION) www.indiandentalacademy.com
  84. 84. CENTER OF RESISTANCE THE ANALOGOUS CENTER OF MASS OF A RESTRAINED BODY e.g. A TOOTH SUPPORTED BY ALVEOLAR BONE IS CALLED CENTER OF RESISTANCE.  www.indiandentalacademy.com
  85. 85.  Or  Is that point through which the resultant of constraining forces acting upon it may be considered to act  Or a point at which resistance to movement can be concentrated for mathematical analysis www.indiandentalacademy.com
  86. 86. CENTER (C Res) OF RESISTANCE OF MAXILLARY MOLAR www.indiandentalacademy.com
  87. 87. CENTER OF RESISTANCE www.indiandentalacademy.com
  88. 88. CENTER OR RESISTANCE (C Res) OF MAXILLA www.indiandentalacademy.com
  89. 89.  Definition of terms  CENTER OF ROTATION It is an arbitary point about which a body appears to have rotated as determined from its initial and final position. The center of rotation is located at variable points depending on how far the force is applied. www.indiandentalacademy.com
  90. 90. MOMENT OF A FORCE Defined as the product of force times the perpendicular distance from the point of force application to the center of resistance. Tendency to rotate resulting from a force NOT acting at the center of resistance is called MOMENT OF A FORCE. www.indiandentalacademy.com
  91. 91. MOMENT = FORCE X PERENDICULAR DISTENCE www.indiandentalacademy.com
  92. 92. TOOTH MOVEMENTS RESULTING FROM FORCES NOT ACTING THROUGH THE CRes IS A COMBINATION OF ROTATION AND TRANSLATION www.indiandentalacademy.com
  93. 93.  Definition of terms COUPLE Two non-collinear forces equal in magnitude and opposite in direction. Application of a couple causes pure rotation  www.indiandentalacademy.com
  94. 94. MOMENT OF A COUPLE Tendency to rotate when a couple is applied.  Moment of couple= one of the forces of couple X perendicular distance between two parallel forces of coule www.indiandentalacademy.com
  95. 95. www.indiandentalacademy.com
  96. 96. LINE OF ACTION  Line of action of a force is that line connecting the point of origin of force ( head cap or neck) to the point of attachment ( hook on outer bow.  The resultant force acting on banded molar tooth is the relationship of line of action to centre of resitance of tooth www.indiandentalacademy.com
  97. 97. www.indiandentalacademy.com
  98. 98. www.indiandentalacademy.com
  99. 99.  The line of action depend on the point of attachment (hook on the outer bow) www.indiandentalacademy.com
  100. 100. Teeth can be moved in 3 planes  Sagittal plane  Coronal plane  Transverse plane www.indiandentalacademy.com
  101. 101. Sagittal plane  point of attachment (outer bow hook)can be anywhere on the line a-p axis ,V-Vi axis in the saggital rectangle www.indiandentalacademy.com
  102. 102. V P A Vi www.indiandentalacademy.com
  103. 103. Shape of outer bow is of no consequence www.indiandentalacademy.com
  104. 104. Point of attachment can be varied by  Varying the length of outer bow  Varying the angle between inner and outer bow  combination www.indiandentalacademy.com
  105. 105. Cervical headgear for bodily movement www.indiandentalacademy.com
  106. 106. Location of point of attachment www.indiandentalacademy.com
  107. 107. Distal force component  Distal force is maximum when line of action is horizontal,rather than inclined, and passes through centre of resistance. www.indiandentalacademy.com
  108. 108. Minimal inclined line of action www.indiandentalacademy.com
  109. 109. Steep line of action www.indiandentalacademy.com
  110. 110. Coronal plane  The magnitude of the intrusive or extrusive vertical component is dependent upon the inclination or steepness of line of action  Steeper the line of action more extrusive or intrusive vertical component  Horizontal forces neither extrude or intrude www.indiandentalacademy.com
  111. 111.  Since line of action passes bucally during intrusion or extrusion these teeth will tend to roll.  Buccal crown movement during intrusion and palatal crown movement during extrusion  The moment or rotation effect is depend upon molar tube height from centre of resistence  Soldering a palatal bar can solve this www.indiandentalacademy.com problem
  112. 112. www.indiandentalacademy.com
  113. 113. Palatal bar for bodily intrusion www.indiandentalacademy.com
  114. 114. Transverse plane  Tooth can be moved distally and medially or laterally  expansion or contraction of inner arch of face bow will be translate the crown of molar medially or laterally www.indiandentalacademy.com
  115. 115. Lateral forces on molar during extraoral force application  Lateral forces in case of symmetrical face bow www.indiandentalacademy.com
  116. 116. Offset joint in face bow 70 18 16 14 16 www.indiandentalacademy.com
  117. 117.  This difference is due to flexibility of arm and not due to offset joint  If  outer bow is rigid force will be same the rationale of unequal force distribution to molars relates to the distance of outer bow to the mid sagittal plane www.indiandentalacademy.com
  118. 118. Symmetrical soldered outerbow with different arm length www.indiandentalacademy.com
  119. 119. www.indiandentalacademy.com
  120. 120.  In clinical practice lengthening one arm or bending it out will create more distal force on that side  A mild expansion of inner bow wil counteract the lateral force on lengthen side www.indiandentalacademy.com
  121. 121. Swivel type of unilateral extraoral face bow  Most suitable without any lateral force www.indiandentalacademy.com
  122. 122. HEADGEARS IN COMBINATION THERAPY  FUNCTIONAL APPLIANCE  EXTRAORAL FORCE  CLASS II DIV I CASES WITH  More excessive vertical growth pattern  Excessive lower anterior facial height www.indiandentalacademy.com
  123. 123.  ACTIVATOR WITH HEADGEAR  Hasund (1969)  Stockfisch (1977)  Stockli (1982)  Pfeiffer (1984)  Grobety (1984) www.indiandentalacademy.com
  124. 124. PFEIFFER-GROBETY TECHNIQUE www.indiandentalacademy.com
  125. 125. STOCKLI-TEUSCHER APPLIANCE www.indiandentalacademy.com
  126. 126. HEADGEAR WITH BIONATOR www.indiandentalacademy.com
  127. 127.  FRANKEL APPLIANCE WITH HEADGEAR www.indiandentalacademy.com
  128. 128. Thank you For more details please visit www.indiandentalacademy.com www.indiandentalacademy.com

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