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4. REM
OVABLE APPLI ANCE
• REMOVABLE APPLIANCE ARE
ORTHODONTIC
DEVICES
WHICH CAN BE TAKEN OUT BY
THE PATIENT FOR CLEANING
AND WHICH ARE DESIGNED
TO APPLY FORCES TO THE
TEETH BY MEANS OF SPRINGS
SCREWS
AND
OTHER
MECHANICAL COMPONENTS.
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6. VI CTOR H
UGO JACKSON
• Early 20th century
• United States
• Appliances of vulcanite base
with a precious metal or
nickel-silver wire.
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7. GEORGE CROZAT
• Early 1900’s
completely
of
• Appliance
precious metal.
• Had a clasp on molars and
finger springs on anteriors
made up of light wire, on a
framework of heavy gold wire.
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9. Reas ons f or i nc r eas ed
us e of r em abl e
ov
appl i anc es i n Eur ope
• Angles View.
• Social welfare system rapidly
developed.
• Scarcity of precious metals.
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11. 1.
Tipping,
overbite
correction
more readily undertaken.
2. Less complex control as less
teeth moved at a time and simple
movements done.
3. Can
eliminate
occlusal
interferences.
4. Can be done be a general
practitioner.
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12. 6.
7.
8.
9.
Less chairside time.
Less expensive.
Cleaned by the patient.
If causing trouble to the
patient can be removed.
10. Aesthetically better.
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14. Patient cooperation necessary.
Only tipping is possible.
Rotations of only one or two teeth
is possible if more then fixed
appliances.
Only few teeth can be moved at a
time so prolongs the treatment.
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15. Can not be done in extraction
cases as no bodily movement.
Encroaches the tongue space
and hence a problem in
retention.
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23. • The name clasp is derived
from
a
French
word
“UYPTAN” which means to
embrace. Clasps are the
retentive components of the
orthodontic appliances.
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24. • RETENTION :- is the
means whereby the
displacement of an
appliance is resisted.
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25. I DEAL REQUI REM
ENTS
Unobtrusive.
Not impinge.
Close contact to the tooth.
Usable in both deciduous and
permanent dentition.
Adequate retention.
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26. No active force on the anchor
tooth.
Rigid
Easy to fabricate and also
replace if needed.
Not interfere in the growth
of jaws and eruption of teeth.
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27. CLASSI FI CATI ON
A.
Hand Made
Machine Made.
B.
Single tag arm
Double tag arm
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28. M
ODE OF ACTI ON
engage
onto
the
• Clasp
undercuts (constricted areas
on the teeth.)
• Two types of undercuts.
/
– Buccal
undercuts.
/
– Mesial
undercuts.
Lingual
Cervical
Distal
Proximal
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30. • Circumferential clasp / CClasp / 3/4th Clasp.
• To use the bucco-cervical
undercut.
• 2nd molar and canines.
• Single retention arm.
• 1mm wire used in molars.
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32. Adv ant ages
•
•
•
•
Good retention.
Easy to fabricate.
Single occlusal crossover wire.
Easy to replace.
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33. Di s adv ant ages
• Not on semi-erupted tooth.
• Decalcification of cervical
margin.
• Gingival irritation.
• Plaque accumulation enhanced.
• Easily distort.
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35. • V.H. Jackson 1906
• Jacksons Clasp / Full Clasp /
U Clasp.
bucco-cervical
and
• Both
proximal undercuts.
• 0.7mm to 1mm.
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44. called
as
MODIFIED
• Also
ZIMMER CLASP.
• Excellent retention by the single
arrowhead in the interproximal
area.
• Open end towards the occlusal.
• Can engage elastics.
• 0.7mm wire
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49. • Action and location similar to
triangular clasp.
• Prefabricated available. Can
be made by adding solder to
end of a wire.
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51. Adv ant ages
•
•
•
•
Easy to fabricate.
Single occlusal interference.
Less gingival irritation.
Easy to replace.
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52. Di s adv ant ages
• Short arm makes adjustment
difficult.
• Can not be used for primary
retention.
• Cannot be used in absence of
adjacent tooth.
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56. Adv ant ages
• Reliable retention.
not
interfere
in
• Does
posterior occlusion.
wire
hence
more
• More
flexible.
• More easy to adjust.
• Enhances eruption.
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57. Di s adv ant ages
•
•
•
•
•
Difficult to fabricate.
Needs special plier.
Irritates soft tissue.
Tends to separate teeth.
Is bulky hence less patient
compliance.
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59. • Crozat in 1920
• Along with the u clasp a
stright wire is soldered on the
base (Cresent).
• Strong retention is possible
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62. • Adams clasp / modified arrowhead
clasp / liverpool clasp / universal
clasp.
• C. PHILIPS ADAMS in May 1950.
• Most widely used clasp.
• Distobuccal and mesiobuccal undercuts.
• Does not separate teeth like a
arrowhead clasp.
• 0.7mm posteriors
0.6mm anteriors.
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65. BRI DGE
• Is 2/3rd the mesio dital width of the
tooth, or slightly less then the distance
between mesiobuccal and distobuccal
undercuts, or length should be equal to
the intercuspal distance.
• Is 1-2mm away from the buccal surface
of the tooth.
• Is at 45o to the buccal surface of the
tooth.
• Should be straight.
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66. Ar r owheads
• They should lie in the disto- and
mesio buccal undercuts.
• Shaped according to the curve of
the
gum
margins
into
the
interdental papilla.
• Long enough to keep the bride at a
proper distance.
• Should not touch the adjacent
teeth
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67. Tag ar m
s
• Closely fitted to the contact points,
down to the interdental embrasure.
• Space between the tag arms and
palate for flow of acrylic.
• No sharp bends.
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69. Adv ant ages
• Small neat and unobtrusive.
• Any tooth.
• Both deciduous and permanent
dentition.
• Even on semi erupted tooth.
• No specialized pliers required.
• Can be modified as needed.
• No. of variations are available.
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70. di s adv ant ages
• Unwanted palatal tipping if gets
activated.
• May lead to elongation of tooth if
is fitting tightly.
• Can be repaired only if fractured
through the arrowheads.
• Cannot be given on proclined
anteriors.
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