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

www.indiandentalacademy.com
 Removable orthodontic appliances
are those that can be inserted and
removed from oral cavity by patient
at will or by an...
Of Historical Importance
 Coffin plate (1881) , with spring which
was then made PIANO wire.
 Norman Kingsley (1880) firs...
Development of Removable
Appliances

 In United States, Victor Hugo Jackson was the
chief proponent of removable applianc...
In European mid twentieth century removable
appliances differentiated into
 Activators or functional appliances
 Active ...
Advantages
 Can be removed on socially sensitive occasions
 Patient can maintain good oral hygiene; the
appliance can al...
 Less chair side time
 Simple malocclusions can be treated by
general practitioner
 Relatively inexpensive
 Damaged ap...
Disadvantages
 Patient co-operation .
 Capable of only tipping movement
 Lower removable appliances are not well
tolera...
Case selection
Occlusion

Do not attempt in severe Class II and Class III malocclusion
particularly skeletal discrepancies...
Active Plate
 The removable appliance used at present
were developed before World War II. At
that time there were two dis...
Basic components of

Active plate

 Active elements
- Labial bow
- Springs
- Screws
- Elastics

 Retentive elements
The...
Labial Bows
Parts of labial bow
1. Incisor segment
2. Vertical loops
3. Cross over section
4. Retentive arm

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Incisor segment
 Usually in the junction of middle third and
incisal third
 Right angle bend at the mesial third of
cani...
Vertical loops
 Consists of parallel vertical legs
joined by a smooth curve.
 Its usually 9 – 12 mm, extending 2
– 3 mm ...
Cross over section

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Uses:
 Move teeth lingually.
 Correcting the minor discrepancy in the
overjet
 Support for soldered springs, bar loops ...
The various types of Labial bows









Short labial bow
Long labial bow
Split labial bow
Reverse labial bow
Rob...
Short Labial Bow
 Constructed using 0.7 mm stainless steel wire.
 Retentive arm distal to canine.
 It is very stiff and...
Long Labial Bow
INDICATIONS


Minor anterior space closure



Minor overjet reduction



Closure of space distal to can...
Split Labial Bow
 Split in middle 2 separate buccal arms having U
loop
 Increased flexibility

INDICATIONS
Anterior ret...
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Reverse Labial Bow

 The U loops are placed distal to the canine
 Free ends of the U loop are adapted occlusally
between...
 ACTIVATION is in two steps –
First the U loop is opened which
results in lowering of the labial bow in the
incisior regi...
High labial bow with apron
springs
 Consists of a heavy wire labial bow (0.9 or 1
mm) that extends into the buccal vestib...
ACTIVATION
 Apron spring is activated by bending it
towards the teeth
DISADVANTAGES
 Difficulty in construction
 Risk o...
Fitted Labial Bow

 Adapted to confirm to the contours of labial
surfaces
 Used only as a retainer
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Roberts Retractor
 Flexible bow constructed
from 0.5 mm diameter wire
inserted into a stainless
steel tubing to give supp...
Indication

In patients with severe overjet of over 4 mm

Activation
 The bow is adjusted by bending the vertical
limb be...
Mills Retractor

 Called as ‘extended labial bow’.
 Extensive looping increases the flexibility


Indicated in patients...
Labial wire with M loop

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Labial wire with soldered hooks

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Springs
CLASSIFICATION

Based on the direction of tooth movement:

1.Springs used for mesio – distal tooth movement
2.Spri...
Factors to be considered in
designing of a spring
Within the elastic limit a spring may be deflected
by pressure P at a fr...
Double the pressure
double the deflection
Doubling the the length
the deflection becomes
8 times more for the
same amount ...
Pressure Gauges

Plunger type of gauge
(Dontrix)

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Correx pressure gauge

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Single Cantilever Spring
 Also called as “finger spring”.
INDICATIONS:
1. Is used for the mesio-distal movement of
the te...
PARTS
 Consists of an active arm
12 – 15 mm length towards
the tissue.
 The helix of not more than
3 mm internal diamete...
CONSTRUCTION
 Constructed from 0.5 mm wire
 Coil should lie along the long axis of the
tooth to be moved and perpendicul...
 For maximum resilience, the coil should
lie on the opposite side of the spring
from the the tooth. So that it is bound u...
 In order to protect it from damage, the
spring is boxed so that it lies in the recess
between the base plate and mucosa....
Double Cantilever Spring
 Also known as “Z – Spring”

INDICATION
 Labial movement of single
incisors or both
 To bring ...
 CONSTRUCTION
1. From 0.5 mm hard round
stainless steel wire
2. Spring consists of 2 coils
very small in diameter
3. Spri...
4. Retentive arm of 10 – 12 mm length
that gets embedded into acrylic
5. Should be boxed prior to acrylization.

 ACTIVAT...
T Spring
Indication
When a premolar or a
canine has to be moved
buccally

Construction
 Made of 0.5 mm hard round
stainle...
Coffin spring
Introduced by WALTER COFFIN
 Removable type of expansion spring
 Indication
Used to bring about slow trans...
Construction
Made of 1.25 mm hard
stainless steel wire
 Consists of a U or a OMEGA
shaped wire placed in the mid
palatal ...
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 Activation
Four registration points are drilled at the
extremities of base plate for recording the
amount of expansion b...
 By pulling the sides apart manually, first in
the premolar region and then in the molar
region
 Activation of 1-2 mm at...
Whip appliance
 Rotation of a canine can
be accomplished
 0.35 mm wire is
attached to a bracket on
a canine band
 The f...
Closed protrusion springs
 Both the ends of
the springs are
embedded in acrylic
 Made of thinner
wires 0.4 mm

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Canine retractors
U loop canine retractors
 Made of 0.6 or 0.7 mm wire.
 Consists of U loop, active
arm and a retentive ...
 Used when minimal retraction of 1-2 mm is
required

 Activation
By closing the loops by 1-2 mm or cutting the
free end ...
Palatal canine retractor
 Made of 0.6 mm wire
 Consists of a coil of 3
mm active arm,
retentive arm

Helix is placed alo...
Reverse loop buccal retractor
 Also called as Helical canine retractor
 Favored when the sulcus is shallow as in
case of...
 Mesial arm is adapted
between the premolars
 The distal arm is active
bent at right angles to
engage canine below the
h...
ACTIVATION
 Should not be activated more than 2 mm
 Done by cutting off 1 mm from free end and
readpting
 Alternatively...
Buccal self supported canine
retractor
 Constructed of 0.7 mm wire
 Called self supported because it is made
of thicker ...
 Coil lies just distal to the
long axis of tooth
 Anterior limb passes down
from the coil to the middle
of the crown and...
 Used in case of a buccaly placed canine or
in case of a canine placed high in
vestibule

Features
 Activated by closing...
Elastics
 Seldom used.
 May be used for movement of single teeth
or group of teeth and for intermaxillary
traction
 Use...
 Intermaxillary elastics with removable plates
can be used for the treatment of Class II and
Class III

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Disadvantages
 Slip gingivally and cause trauma
 Risk of the arch form getting flattened
 Continuous immersion in saliv...
Clasps


Defined as a component of removable orthodontic
appliances that retains and stabilizes an orthodontic
appliance ...
Mode of action
 They act by engaging the
constricted areas of teeth called
undercuts
 Two types
1. Buccal and lingual ce...
Circumferential clasp
 C clasp or Three quarter clasp
 Engages the bucco cervical
undercut
 Wire is engaged from one
pr...
C clasp with
horizontal loop

C clasp with
vertical loop
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Advantages
 Simplicity in design and fabrication

Disadvantages
 Cannot be used in partially erupted teeth
 Its made of...
Jackson's clasp
 Introduced by Jackson in
1906
 Full clasp or U clasp
 Engages bucco cervical
undercut and mesio distal...
Advantages
 Easy to construct
 Adequate retention

Disadvantages
 Inadequate retention in partially erupted
teeth

www....
Crozat clasp

 It resembles a full clasp but has a additional
piece of wire soldered which engages into the
mesial and di...
Triangular clasp
 Introduced by Zimmer in
1949
 Used between two adjacent
posterior teeth
 Engage the proximal
undercut...
 0.7mm stainless steel
 The triangle should be perpendicular to the
tooth surface or parallel to the occlusal
surface fo...
Southend clasp
 Retention in anterior
region
 Wire adapted along
the cervical margins of
both the central
incisors
 Dis...
Ball End clasp

 Additional retention

 The ball can be made at the end of
the wire using a silver solder
 Preformed wi...
 The ball engages the proximal undercut
between two posterior teeth

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Modifications
Ball clasp in the
form of C clasp

Ball clasp with
extended arm

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Arrow pin clasp
 A solid arrow is bent to engage
interdental space and provides a firm
grip on teeth

www.indiandentalaca...
Eyelet clasp

 Can be single , double
or continuous
 Eyelet formed without
sharp bends so
breakage is unlikely.

www.ind...
Duyzing’s clasp
 Made by two wires emerging
from the plate to cross the
occlusion over the anterior and
posterior contact...
Arrow head clasp
 By A. M. Schwarz (1935)

Parts
1. The arrow head portion
2. Vestibular portion
3. Retentive arms

www.i...
 The arrow heads bent in
horizontal plane perpendicular to
long axis engage the
interproximal undercuts

 The vestibular...
Pliers

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Advantages
 More elastic
 The possibility of adjusting the arrows
slightly mesially or distally
 Used both on deciduous...
Disadvantages
 Needs a special type of pliers
 Occupies a large amount of space
 Arrow heads can injure the interdental...
Adams clasp
 Described by Philip Adam
 Liverpool clasp , Universal clasp and
Modified arrow head clasp
 Constructed usi...
 The two arrowheads engage the mesial
and the distal proximal undercuts.
 The arrowheads are connected to each
other by ...
Advantages

 It is rigid and offers excellent retention.
 Can be fabricated on both deciduous and
permanent dentition.
...
Essential features of Adam’s clasp

 Bridge is straight.
 Arrowheads are parallel and must not
contact adjacent tooth.
...
 Tags are formed by turning down at right
angles.
 The clasp should be passive but in contact
with the teeth when fully ...
Adjustment

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Modifications

Adam with single arrow head
 Indicated in a partially erupted tooth usually the
last erupted molar
 Arrow...
Adam with J hook

Adam with incorporated
helix

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Adam with soldered
buccal tube
 This permits the use of
extraoral anchorage
using face bow - head
gear assembly

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 Adam with distal extension

 Adam on incisors and premolars

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Adam with additional arrowhead
 The additional arrowhead engages the
proximal undercut of the adjacent tooth
and is solde...
Delta clasp





W. J Clark (1985)
Retention of twin block appliance
Modification of Adams clasp
Retentive loops are i...
Base plate
 The frame work of the removable
appliance
Functions
 Unites all components of the appliance
into one unit
 ...
Maxillary plate
Extension
 The maxillary base plate
usually covers the entire
palate till the distal of the
first molar.
...
Anterior bite plane

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Modifications

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Posterior bite plane

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Guide planes

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Materials used

Heat cure

Self cure

 More color
stability
 Less porosity
 Strength



Convenience



Speed



Cost...
Heat cure
Steps
 Wire parts of the appliance secured to
the cast by pink wax.
 Cast dipped in water for 10 – 15 minutes
...
 Single sheet of wax is
warmed and pressed
over cast.

 Wax is trimmed to
shape with a double
flat ended instrument.

 ...
 While flasking care should be taken to put
plaster around the springs and in the coil.
 When processed the appliance is...
Self cure
Steps
 The cast is coated with separating medium.
 All the components are secured in position
using pink wax.
...
 Self cure acrylic is applied –
- single mix technique
- salt and pepper/sprinkle on technique
 Appliance trimmed and po...
Clear acrylic resins
Advantage
 Blanching of the tissues can be seen.
 Any entrapment of food can be observed.
Thermopla...
Delivery of the appliance

 Check that the previously described design
has been made correctly.
 Check for any roughness...
Instructions







Insertion & removal.
Duration
Cleaning
Activation of screws

Report to clinic in case of any dama...
The advantage of removable orthodontic appliance is that
it can be taken out. The user must take it out and clean
dental p...
Examination at each return visit

 Enquire if the appliance has been
comfortable.
 Patient asked to remove & insert the
...
 Amount of tooth movement
 Soft tissue
 Reschedule the next appointment - 4
weeks interval.

www.indiandentalacademy.co...
Decline
 Since 1970 decline in U K
 Series of technical advances

ORTHODONTIC BANDS
Preforme
Prewelded
d
DIRECT BONDED A...
According to BDJ sept 22 2001 vol 191
 Quality not so high
 Higher discontinuation of treatment
 Few general practioner...
Conclusion
It is emphasized that if good results are to
be obtained meticulous attention must be
paid to case history, tre...
Bibliography
 Removable appliance fabrication :
Witt ,Shaye and Gehrke
 Removable Orthodontic appliances :
Graber and Ne...
THANK YOU…

www.indiandentalacademy.com
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Rem app two /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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Rem app two /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.  Removable orthodontic appliances are those that can be inserted and removed from oral cavity by patient at will or by an orthodontist for adjustment. www.indiandentalacademy.com
  3. 3. Of Historical Importance  Coffin plate (1881) , with spring which was then made PIANO wire.  Norman Kingsley (1880) first described his plate for “JUMPING THE BITE”  Pierre Robin (1902) constructed the first Split plate  In England J.H Badcok (1911) described expansion screw www.indiandentalacademy.com
  4. 4. Development of Removable Appliances  In United States, Victor Hugo Jackson was the chief proponent of removable appliance.  Europe - Removable appliances  U. S. - Fixed appliances DEVELOPMENT IN EUROPE BDJ sept 22 2001 vol 191  Angle’s emphasis on precise positioning had less impact.  Precious metal for fixed less available www.indiandentalacademy.com
  5. 5. In European mid twentieth century removable appliances differentiated into  Activators or functional appliances  Active plate At present removable appliances are indicated for three major uses:  Growth modification  Limited (tipping) tooth movements  Retention www.indiandentalacademy.com
  6. 6. Advantages  Can be removed on socially sensitive occasions  Patient can maintain good oral hygiene; the appliance can also be kept clean.  Majority of the malocclusions which requires tipping can be readily treated.  Bite planes can be incorporated into it. www.indiandentalacademy.com
  7. 7.  Less chair side time  Simple malocclusions can be treated by general practitioner  Relatively inexpensive  Damaged appliances that apply undesirable forces can be removed www.indiandentalacademy.com
  8. 8. Disadvantages  Patient co-operation .  Capable of only tipping movement  Lower removable appliances are not well tolerated Multiple rotations are difficult to treat.  In extraction cases it is difficult to close the residual spaces.  Greater chance of appliance being misplaced or damaged.  www.indiandentalacademy.com
  9. 9. Case selection Occlusion Do not attempt in severe Class II and Class III malocclusion particularly skeletal discrepancies The patient      Where Frankfort mandibular angle is very high or low Where extensive treatment of lower arch is needed Where teeth has to be moved bodily Where there is extensive rotation In uncooperative patient www.indiandentalacademy.com
  10. 10. Active Plate  The removable appliance used at present were developed before World War II. At that time there were two distinctly different devices: 1. The active plate – uses force within the appliance. 2. The activator – used muscular forces. www.indiandentalacademy.com
  11. 11. Basic components of Active plate  Active elements - Labial bow - Springs - Screws - Elastics  Retentive elements The base plate - Clasps www.indiandentalacademy.com
  12. 12. Labial Bows Parts of labial bow 1. Incisor segment 2. Vertical loops 3. Cross over section 4. Retentive arm www.indiandentalacademy.com
  13. 13. Incisor segment  Usually in the junction of middle third and incisal third  Right angle bend at the mesial third of canine.  Contacts only the most prominent teeth www.indiandentalacademy.com
  14. 14. Vertical loops  Consists of parallel vertical legs joined by a smooth curve.  Its usually 9 – 12 mm, extending 2 – 3 mm above the gingival margin. www.indiandentalacademy.com
  15. 15. Cross over section www.indiandentalacademy.com
  16. 16. Uses:  Move teeth lingually.  Correcting the minor discrepancy in the overjet  Support for soldered springs, bar loops or for hooks to attach elastic bands  Friction of labial wire against the anterior teeth act as clasp to enhance the fit of the plate.  Retention www.indiandentalacademy.com
  17. 17. The various types of Labial bows         Short labial bow Long labial bow Split labial bow Reverse labial bow Roberts retractor Mills retractor High labial bow with apron springs Fitted labial bow www.indiandentalacademy.com
  18. 18. Short Labial Bow  Constructed using 0.7 mm stainless steel wire.  Retentive arm distal to canine.  It is very stiff and exhibits low flexibility Indication  Minor overjet reduction  Anterior space closure.  Retention Activation - compressing the “U” loops. www.indiandentalacademy.com
  19. 19. Long Labial Bow INDICATIONS  Minor anterior space closure  Minor overjet reduction  Closure of space distal to canine  Guidance of canine during retraction  Retention www.indiandentalacademy.com
  20. 20. Split Labial Bow  Split in middle 2 separate buccal arms having U loop  Increased flexibility INDICATIONS Anterior retraction Modified form for closure of midline diastema ACTIVATION compressing U loop 1-2 mm at a time www.indiandentalacademy.com
  21. 21. www.indiandentalacademy.com
  22. 22. Reverse Labial Bow  The U loops are placed distal to the canine  Free ends of the U loop are adapted occlusally between first premolar and canine  INDICATIONS - www.indiandentalacademy.com labial bow similar to short
  23. 23.  ACTIVATION is in two steps – First the U loop is opened which results in lowering of the labial bow in the incisior region Second a compensatory bend is given at the base of U loop to maintain proper level of the bow www.indiandentalacademy.com
  24. 24. High labial bow with apron springs  Consists of a heavy wire labial bow (0.9 or 1 mm) that extends into the buccal vestibule  Apron springs made of 0.4 mm wire are attached USES  Retraction of one or more teeth Cases of large overjet due to increased flexibility  www.indiandentalacademy.com
  25. 25. ACTIVATION  Apron spring is activated by bending it towards the teeth DISADVANTAGES  Difficulty in construction  Risk of soft tissue injury www.indiandentalacademy.com
  26. 26. Fitted Labial Bow  Adapted to confirm to the contours of labial surfaces  Used only as a retainer www.indiandentalacademy.com
  27. 27. Roberts Retractor  Flexible bow constructed from 0.5 mm diameter wire inserted into a stainless steel tubing to give support  Consists of a coil of 3 mm diameter mesial to canine www.indiandentalacademy.com
  28. 28. Indication In patients with severe overjet of over 4 mm Activation  The bow is adjusted by bending the vertical limb below the coil  As the incisor moves palatally, the bow will drop anteriorly and the level of horizontal part should be adjusted www.indiandentalacademy.com
  29. 29. Mills Retractor  Called as ‘extended labial bow’.  Extensive looping increases the flexibility  Indicated in patients with large overjet  Disadvantages - Difficulty in construction - Poor patient acceptability www.indiandentalacademy.com
  30. 30. Labial wire with M loop www.indiandentalacademy.com
  31. 31. Labial wire with soldered hooks www.indiandentalacademy.com
  32. 32. www.indiandentalacademy.com
  33. 33. Springs CLASSIFICATION Based on the direction of tooth movement: 1.Springs used for mesio – distal tooth movement 2.Springs used for labial movement 3.Springs used for lingual movement 4.Springs used for expansion of arches. Based on nature of support required for its action: 1. Self supporting springs 2.Guided Springs 3.Auxillary Springs www.indiandentalacademy.com
  34. 34. Factors to be considered in designing of a spring Within the elastic limit a spring may be deflected by pressure P at a free end if the length is L and thickness is T then deflection D is given by D α PL3 T4 www.indiandentalacademy.com
  35. 35. Double the pressure double the deflection Doubling the the length the deflection becomes 8 times more for the same amount of pressure If the thickness is reduced by half deflection becomes 16 times greater for the same amount of www.indiandentalacademy.com pressure
  36. 36. Pressure Gauges Plunger type of gauge (Dontrix) www.indiandentalacademy.com
  37. 37. Correx pressure gauge www.indiandentalacademy.com
  38. 38. Single Cantilever Spring  Also called as “finger spring”. INDICATIONS: 1. Is used for the mesio-distal movement of the teeth. 2. Can be used for labial movement (cranked) www.indiandentalacademy.com
  39. 39. PARTS  Consists of an active arm 12 – 15 mm length towards the tissue.  The helix of not more than 3 mm internal diameter.  A retentive arm of 4 – 5 mm is kept away from the tissues and ends in a small retentive tag. www.indiandentalacademy.com
  40. 40. CONSTRUCTION  Constructed from 0.5 mm wire  Coil should lie along the long axis of the tooth to be moved and perpendicular to the direction of movement. www.indiandentalacademy.com
  41. 41.  For maximum resilience, the coil should lie on the opposite side of the spring from the the tooth. So that it is bound up as the appliance is inserted and unwinds as the tooth moves. www.indiandentalacademy.com
  42. 42.  In order to protect it from damage, the spring is boxed so that it lies in the recess between the base plate and mucosa. ACTIVATION  The finger spring is activated by moving the active arm towards the teeth to be moved.  Should be done as close to the coil as possible. www.indiandentalacademy.com
  43. 43. Double Cantilever Spring  Also known as “Z – Spring” INDICATION  Labial movement of single incisors or both  To bring about minor rotations www.indiandentalacademy.com
  44. 44.  CONSTRUCTION 1. From 0.5 mm hard round stainless steel wire 2. Spring consists of 2 coils very small in diameter 3. Spring should be perpendicular to palatal surface of the tooth otherwise ,it tends to slide down and intrude it. www.indiandentalacademy.com
  45. 45. 4. Retentive arm of 10 – 12 mm length that gets embedded into acrylic 5. Should be boxed prior to acrylization.  ACTIVATION By opening both the helixes by about 2 – 3 mm at a time .In case of minor rotation one of the helix is opened. www.indiandentalacademy.com
  46. 46. T Spring Indication When a premolar or a canine has to be moved buccally Construction  Made of 0.5 mm hard round stainless steel wire  Spring consists of a T shaped arm whose ends are embedded in acrylic www.indiandentalacademy.com
  47. 47. Coffin spring Introduced by WALTER COFFIN  Removable type of expansion spring  Indication Used to bring about slow transverse dentoalveolar arch expansion in case of unilateral cross bite www.indiandentalacademy.com
  48. 48. Construction Made of 1.25 mm hard stainless steel wire  Consists of a U or a OMEGA shaped wire placed in the mid palatal region with retentive arms incorporated in the base plate  Appliance gets retention from adams clasp on molars and premolars  www.indiandentalacademy.com
  49. 49. www.indiandentalacademy.com
  50. 50.  Activation Four registration points are drilled at the extremities of base plate for recording the amount of expansion by divider www.indiandentalacademy.com
  51. 51.  By pulling the sides apart manually, first in the premolar region and then in the molar region  Activation of 1-2 mm at a time appropriate www.indiandentalacademy.com
  52. 52. Whip appliance  Rotation of a canine can be accomplished  0.35 mm wire is attached to a bracket on a canine band  The flexible spring is hooked under the labial bow and produces a very gentle rotation force www.indiandentalacademy.com
  53. 53. Closed protrusion springs  Both the ends of the springs are embedded in acrylic  Made of thinner wires 0.4 mm www.indiandentalacademy.com
  54. 54. Canine retractors U loop canine retractors  Made of 0.6 or 0.7 mm wire.  Consists of U loop, active arm and a retentive arm.  Mesial arm of the U loop is bent at right angles and adapted around canine below its contact point  U loop should be 2-3 mm below the cervical margin www.indiandentalacademy.com
  55. 55.  Used when minimal retraction of 1-2 mm is required  Activation By closing the loops by 1-2 mm or cutting the free end of active arm by 2 mm and readapting it www.indiandentalacademy.com
  56. 56. Palatal canine retractor  Made of 0.6 mm wire  Consists of a coil of 3 mm active arm, retentive arm Helix is placed along the long axis of the canine.  INDICATED in retraction of palatally placed canine   ACTIVATION by opening the helix 2 mm at a time www.indiandentalacademy.com
  57. 57. Reverse loop buccal retractor  Also called as Helical canine retractor  Favored when the sulcus is shallow as in case of lower ach  Made of 0.6 mm wire ,consists of 3 mm diameter coil ,an active arm (towards the tissue) and a retentive arm. www.indiandentalacademy.com
  58. 58.  Mesial arm is adapted between the premolars  The distal arm is active bent at right angles to engage canine below the height of contour  Coil is placed 3 mm below the gingival margin www.indiandentalacademy.com
  59. 59. ACTIVATION  Should not be activated more than 2 mm  Done by cutting off 1 mm from free end and readpting  Alternatively done by opening the helix by 1 mm. www.indiandentalacademy.com
  60. 60. Buccal self supported canine retractor  Constructed of 0.7 mm wire  Called self supported because it is made of thicker diameter wire that resists distortion  Consists of helix of 3mm in diameter,an active arm and a retentive arm www.indiandentalacademy.com
  61. 61.  Coil lies just distal to the long axis of tooth  Anterior limb passes down from the coil to the middle of the crown and passes around the mesial contact area www.indiandentalacademy.com
  62. 62.  Used in case of a buccaly placed canine or in case of a canine placed high in vestibule Features  Activated by closing the the coil  The active arm is away from tissues to avoid impingement of soft tissues while the coil lies towards the tissues  Activation By closing the helix www.indiandentalacademy.com
  63. 63. Elastics  Seldom used.  May be used for movement of single teeth or group of teeth and for intermaxillary traction  Use of intermaxillary elastic bands was first described by Jackson (1904).  Their application was greatly enhanced by introduction of arrow head clasps and modifications of adams clasp. www.indiandentalacademy.com
  64. 64.  Intermaxillary elastics with removable plates can be used for the treatment of Class II and Class III www.indiandentalacademy.com
  65. 65. www.indiandentalacademy.com
  66. 66. Disadvantages  Slip gingivally and cause trauma  Risk of the arch form getting flattened  Continuous immersion in saliva causes a rapid force decay of elastic www.indiandentalacademy.com
  67. 67. Clasps  Defined as a component of removable orthodontic appliances that retains and stabilizes an orthodontic appliance in the oral cavity by contacting the surface of the tooth or surrounding the tooth or by engaging the interproximal embrasures  Resists the displacement orthodontic appliance by contacting the surface of the tooth or by engaging the undercuts  CLASSIFICATION Single arm clasps – C , triangular clasps Double arm clasps –U , Adams clasps www.indiandentalacademy.com
  68. 68. Mode of action  They act by engaging the constricted areas of teeth called undercuts  Two types 1. Buccal and lingual cervical undercuts - Circumferential clasps 2. Mesial and distal proximal undercuts - Adams clasps www.indiandentalacademy.com
  69. 69. Circumferential clasp  C clasp or Three quarter clasp  Engages the bucco cervical undercut  Wire is engaged from one proximal undercut along the cervical margin then carried over the occlusal margin to end as a single retentive tag on the lingual side www.indiandentalacademy.com
  70. 70. C clasp with horizontal loop C clasp with vertical loop www.indiandentalacademy.com
  71. 71. Advantages  Simplicity in design and fabrication Disadvantages  Cannot be used in partially erupted teeth  Its made of thicker wire hence very rigid www.indiandentalacademy.com
  72. 72. Jackson's clasp  Introduced by Jackson in 1906  Full clasp or U clasp  Engages bucco cervical undercut and mesio distal undercuts www.indiandentalacademy.com
  73. 73. Advantages  Easy to construct  Adequate retention Disadvantages  Inadequate retention in partially erupted teeth www.indiandentalacademy.com
  74. 74. Crozat clasp  It resembles a full clasp but has a additional piece of wire soldered which engages into the mesial and distal proximal undercut  Offers better retention than full clasp www.indiandentalacademy.com
  75. 75. Triangular clasp  Introduced by Zimmer in 1949  Used between two adjacent posterior teeth  Engage the proximal undercuts  Indicated when additional retention is needed www.indiandentalacademy.com
  76. 76.  0.7mm stainless steel  The triangle should be perpendicular to the tooth surface or parallel to the occlusal surface for good retention. www.indiandentalacademy.com
  77. 77. Southend clasp  Retention in anterior region  Wire adapted along the cervical margins of both the central incisors  Distal ends are carried over the occlusal embrasures on the palatal side as retentive arms www.indiandentalacademy.com
  78. 78. Ball End clasp  Additional retention  The ball can be made at the end of the wire using a silver solder  Preformed wires having ball at one end is also available www.indiandentalacademy.com
  79. 79.  The ball engages the proximal undercut between two posterior teeth www.indiandentalacademy.com
  80. 80. Modifications Ball clasp in the form of C clasp Ball clasp with extended arm www.indiandentalacademy.com
  81. 81. Arrow pin clasp  A solid arrow is bent to engage interdental space and provides a firm grip on teeth www.indiandentalacademy.com
  82. 82. Eyelet clasp  Can be single , double or continuous  Eyelet formed without sharp bends so breakage is unlikely. www.indiandentalacademy.com
  83. 83. Duyzing’s clasp  Made by two wires emerging from the plate to cross the occlusion over the anterior and posterior contact point of the tooth clasped  Then each wire goes above the greatest circumference of the tooth to the middle of the tooth and back again below using the undercut www.indiandentalacademy.com
  84. 84. Arrow head clasp  By A. M. Schwarz (1935) Parts 1. The arrow head portion 2. Vestibular portion 3. Retentive arms www.indiandentalacademy.com
  85. 85.  The arrow heads bent in horizontal plane perpendicular to long axis engage the interproximal undercuts  The vestibular portion stands 1 mm away from the tissues www.indiandentalacademy.com
  86. 86. Pliers www.indiandentalacademy.com
  87. 87. Advantages  More elastic  The possibility of adjusting the arrows slightly mesially or distally  Used both on deciduous or permanent teeth  Facilitates teeth to erupt in position www.indiandentalacademy.com
  88. 88. Disadvantages  Needs a special type of pliers  Occupies a large amount of space  Arrow heads can injure the interdental soft tissues  Difficult and time consuming to fabricate www.indiandentalacademy.com
  89. 89. Adams clasp  Described by Philip Adam  Liverpool clasp , Universal clasp and Modified arrow head clasp  Constructed using 0.7 mm hard stainless steel wire  Parts - Two arrow heads - The bridge - Two retentive arms www.indiandentalacademy.com
  90. 90.  The two arrowheads engage the mesial and the distal proximal undercuts.  The arrowheads are connected to each other by a bridge which is at a 45° to the long axis of the tooth.  Corrected constructed Adams clasp should be passive but in contact with tooth surface when the appliance is fully inserted www.indiandentalacademy.com
  91. 91. Advantages  It is rigid and offers excellent retention.  Can be fabricated on both deciduous and permanent dentition.  Can be used on partially or fully erupted teeth.  Can be used on molars, premolars and incisors  No specialized instruments needed to fabricate.  It is small and occupies minimum space. Clasp can be modified in a number of ways  www.indiandentalacademy.com
  92. 92. Essential features of Adam’s clasp  Bridge is straight.  Arrowheads are parallel and must not contact adjacent tooth.  Bridge stands away from tooth at an angle of 45. www.indiandentalacademy.com
  93. 93.  Tags are formed by turning down at right angles.  The clasp should be passive but in contact with the teeth when fully inverted.  Should not exert any force as it can tip the tooth. www.indiandentalacademy.com
  94. 94. Adjustment www.indiandentalacademy.com
  95. 95. Modifications Adam with single arrow head  Indicated in a partially erupted tooth usually the last erupted molar  Arrow head is made to engage the mesio proximal undercut of the last erupted molar  Bridge is modified to encircle the tooth distally and ends on the palatal aspect as a retentive arm www.indiandentalacademy.com
  96. 96. Adam with J hook Adam with incorporated helix www.indiandentalacademy.com
  97. 97. Adam with soldered buccal tube  This permits the use of extraoral anchorage using face bow - head gear assembly www.indiandentalacademy.com
  98. 98.  Adam with distal extension  Adam on incisors and premolars www.indiandentalacademy.com
  99. 99. Adam with additional arrowhead  The additional arrowhead engages the proximal undercut of the adjacent tooth and is soldered on to the bridge  This offers additional retention www.indiandentalacademy.com
  100. 100. Delta clasp     W. J Clark (1985) Retention of twin block appliance Modification of Adams clasp Retentive loops are in shape of closed triangle ADVANTAGE  Does not open with repeated insertion and removal www.indiandentalacademy.com
  101. 101. Base plate  The frame work of the removable appliance Functions  Unites all components of the appliance into one unit  Helps in anchoring  Provides support for wire components  Helps in distributing the forces over a large area  Bite planes can be incorporated www.indiandentalacademy.com
  102. 102. Maxillary plate Extension  The maxillary base plate usually covers the entire palate till the distal of the first molar. www.indiandentalacademy.com
  103. 103. Anterior bite plane www.indiandentalacademy.com
  104. 104. Modifications www.indiandentalacademy.com
  105. 105. Posterior bite plane www.indiandentalacademy.com
  106. 106. Guide planes www.indiandentalacademy.com
  107. 107. Materials used Heat cure Self cure  More color stability  Less porosity  Strength  Convenience  Speed  Cost  Possible for repair www.indiandentalacademy.com
  108. 108. Heat cure Steps  Wire parts of the appliance secured to the cast by pink wax.  Cast dipped in water for 10 – 15 minutes and the surface wetness allowed to dry. www.indiandentalacademy.com
  109. 109.  Single sheet of wax is warmed and pressed over cast.  Wax is trimmed to shape with a double flat ended instrument.  Any wax inside or about the coil of the spring is removed with a probe. www.indiandentalacademy.com
  110. 110.  While flasking care should be taken to put plaster around the springs and in the coil.  When processed the appliance is deflasked, plaster removed and the plate is trimmed and polished. www.indiandentalacademy.com
  111. 111. Self cure Steps  The cast is coated with separating medium.  All the components are secured in position using pink wax.  Parts of the springs which must not be bound up in the base plate material are covered with pink wax. www.indiandentalacademy.com
  112. 112.  Self cure acrylic is applied – - single mix technique - salt and pepper/sprinkle on technique  Appliance trimmed and polished. www.indiandentalacademy.com
  113. 113. Clear acrylic resins Advantage  Blanching of the tissues can be seen.  Any entrapment of food can be observed. Thermoplastic acrylic sheets which are warmed on a Biostar machine (220° C), the advantage being uniform thickness. www.indiandentalacademy.com
  114. 114. Delivery of the appliance  Check that the previously described design has been made correctly.  Check for any roughness  Trimming acrylic base for proper fit  Adjust springs  Test the functioning of screws.  Examination of clasps  No soft tissue impingement www.indiandentalacademy.com
  115. 115. Instructions      Insertion & removal. Duration Cleaning Activation of screws Report to clinic in case of any damage www.indiandentalacademy.com
  116. 116. The advantage of removable orthodontic appliance is that it can be taken out. The user must take it out and clean dental plaque it thoroughly to remove the dental plaque in the morning and before bed at night. Take out the removable orthodontic appliance, use a toothbrush and some liquid soap to clean every surface of the appliance. After cleaning, the appliance can be worn again. When the orthodontic appliance is not worn, it should be cleaned and immersed in a www.indiandentalacademy.com cup of water.
  117. 117. Examination at each return visit  Enquire if the appliance has been comfortable.  Patient asked to remove & insert the appliance  Check for any facets ,wear upon acrylic & even breakage. www.indiandentalacademy.com
  118. 118.  Amount of tooth movement  Soft tissue  Reschedule the next appointment - 4 weeks interval. www.indiandentalacademy.com
  119. 119. Decline  Since 1970 decline in U K  Series of technical advances ORTHODONTIC BANDS Preforme Prewelded d DIRECT BONDED ATTACHMENTS PREADJUSTED EDGEWISE www.indiandentalacademy.com
  120. 120. According to BDJ sept 22 2001 vol 191  Quality not so high  Higher discontinuation of treatment  Few general practioners willing to undertake orthodontic treatment  Malocclusion requiring tipping are few  Only in certain limited cases they provide simple , effective, efficient treatment www.indiandentalacademy.com
  121. 121. Conclusion It is emphasized that if good results are to be obtained meticulous attention must be paid to case history, treatment planning, appliance design and adjustment. Although removable appliances are adequate to produce majority of tooth movements, it is difficult to attain the precision of fixed appliance. www.indiandentalacademy.com
  122. 122. Bibliography  Removable appliance fabrication : Witt ,Shaye and Gehrke  Removable Orthodontic appliances : Graber and Neumann  Orthodontic treatment with Removable appliances : Houston and Isaacson  The Design Construction Use Of Removable Orthodontic Appliances :C.Philip Adams  Contemporary Orthodontics : Profitt www.indiandentalacademy.com
  123. 123. THANK YOU… www.indiandentalacademy.com

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