‘C’ clasp

The ‘C’ clasp is also known as

“Circumferential” clasp or

three-quarter clasp.

They are simple clasps designed to engage the

bucco-cervical undercut

Wire is engaged from one proximal undercut along the cervical margin then carried over the occlusal embrasure to end as single retentive arm on the lingual aspect that gets embedded in the acrylic base plate

Circumferential Clasp

Advantages:Simplicity in design and fabrication

Disadvantages:It cannot be used in partially erupted teeth wherein the cervical undercut is not available

Jackson’s clasp

It is also called as FULL CLASP or “U” clasp

This clasp engages the bucco-cervicalundercut and also the mesial as well as

distal proximal undercuts.

Wire is adapted along the bucco-cervicalmargin and both the proximal undercuts,then carried over both the occlusalembrasures to end as retentive arms on both sides of the molar.

U clasp

Advantages:Simple to construct

Disadvantages:Offers inadequate retention in

Partially erupted teeth

Circumferential Clasp

U clasp