Friday, December 11, 2009

ORTHODONTIC APPLIANCES

REMOVABLE APPLIANCES
1.Retentive components
2.Active components
3.Base plate

RETENTIVE COMPONENTS
Circumferential Clasp
Crozan
Adams
Jacksons
Ball end
Triangular
Schwarz

ACTIVE COMPONENTS
BOWS
labial bow
short
long
high
reverse
fitted
mill's retainer
robert's retainer

SPRINGS
Z
Cranked
Finger
Coffin

SCREWS
Jack

ELASTICS
used mainly with fixed appliances

ACRYLIC BASE PLATE
To unite all components
To support wire components
To distribute forces
Bite plane

FIXED APPLIANCES

ACTIVE COMPONENTS
Bands
Springs
Elastics
Separators

PASSIVE COMPONENTS
Brackets
Lock pin
Ligature attachment
Lingual tube
Buccal tube
Spur

ADAMS CLASP
Also known as Liverpool ,Universal ,arrowhead Clasp

Devise dby Sir PHILLIPS ADAMS
0.7mm hard round wwire used
Parts
2arrow head
1bridge
2retentive arms

ADVANTAGES
Excellant retention
Simple to make
Only young's plier used
for both deciduous and permanent dentition
for erupted or unerupted teeth
for premolars,molars amd incisors

bridge at 45degree
retentive arms go lingually
arrowheads involve mesial and distal undercuts

MODIFICATIONS OF ADAMS CLASP
single arrow head
Additional arrowhead
AC with distal extension
AC with J hook
AC with loop
AC on premolars and molars

C CLASP

Circumferential or three quater clasp
one retntive arm goes lingually from cervical margins
carried to occlusal embrasure
then to lingual aspect

ADVANTAGES
EASY TO MAKE
YOUNGS PLIER USED
GOOD RETENTION

DISADVANTAGES
not for partially erupted teeth

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