IN THE NAME

OFGOD

Ehsan MotamediDepartment of orthodonticShahid Beheshti medical sciences university

Tehran , Iran

Retention components in orthodontic removable appliance

DEFINITION&

TYPES

• Clasps are wire components that aid in retention of a removable appliance. These are the retentive components that aid in keeping the appliance in place and resist displacement of the appliance

• Type of clasps in orthodontic :1. 'C' clasp or ¾ 'C' clasp2. Adam’s clasp and it’s modifications3. Jackson’s clasp4. Triangular clasp5. Eylet clasp6. South end clasp7. Schwartz clasp8. Duyzing clasp9. prefabricated clasp

'C' CLASPAdvantages :

Disadvantage :

Simple to construct

Prevent mesial migration of tooth

It can’t be used in partially erupted teeth.

Inadequate retention in primary teeth.

Just for molar and premolar

Hard to adjust and Easily set out

Easy to fabricate

Throw Distance between teeth

ADAM'S CLASPParts of Adam’s clasp• Two arrowheads• Bridge• Two retentive arms

Advantages:• This clasp is strong, simple and easily

constructed.• It can be used on any tooth (deciduous or

permanent, partially or fully erupted, incisors or premolars or molars).

• It is comfortable to wear and resistant to breakage.

• It is small and occupies minimum space.• It can be modified in a number of ways.• Nospecialized instrument is needed for

construction of clasp. Routinely used Young’s Universal plier or Adam’s plier can be used.

MODIFICATIONS OF ADAM’S CLASP

SOLDERED HOOK

DISTAL TRACTION

HELIX

ADDITIONAL ARROWHEAD

BUCCAL TUBE

ON INCISORS

JACKSON’S CLASPAdvantages:

Disadvantage:

Simple to construct

Offers adequate retention

Inadequate retention in partially erupted teeth.

Just for molar and premolar

Hard to adjust and Easily set out

Throw Distance between teeth

TRIANGULAR CLASP• engages the proximal undercut of two

adjacent teeth

• It provides excellent retention.

• It doesn’t cause irritation of gingiva.

• It is used when additional retention is required.

EYLET CLASPAdvantages:

Disadvantage:

Probability of breaking is very low

Not interrupt The tooth eruption.

Requires special pliers

Occupies more space

Hard to adjust and Easily set out

Throw Distance between teeth

SOUTH END CLASP• It provides retention in the anterior region.

• The wire is adapted along the cervical margin of both the central incisors.

• The distal end of the wire crosses over the Occlusal embrasures and end as retentive arms on the palatal side.

SCHWARTZ CLASPAdvantage :

• This clasp has a number of arrowheads that engage the inter-proximal undercuts of posterior teeth.

• Not interrupt The unerupted tooth or primary teeth.• Can set it up for mesial or distal easily

Disadvantage :

• It needs special arrowhead forming pliers.• It occupies a large amount of space in the buccal

vestibule.• The arrowheads can injure the interdental soft tissues.• It is difficult and time consuming to fabricate.

DUYZING CLASPAdvantages:

Disadvantage:

Possible to use only one-half of the clasp

One-half may be made to extend fully to the anterior or posterior part of the tooth

Provides limited retention

Accumulation of food debris is more in this type of clasp

Does not irritate of the gingiva

PREFABRICATED CLASPARROWHEAD

CLASPINTERDENTAL

CLASPARROWHEAD

ANCHOR CLASPTRIANGULAR

CLASPBALL END

CLASP

THANK YOU FOR YOUR ATTENTION