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RETENTIVE COMPONENTS OF URA . Retentive components. Clasps Adam’s clasp C-clasp (Circumferential clasp) Lingual extension clasp Ball clasp. Adam’s Clasp. The most useful clasp in removable appliances. It is designed to engage the MB, DB undercuts of posterior teeth.

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retentive components
Retentive components
  • Clasps
    • Adam’s clasp
    • C-clasp (Circumferential clasp)
    • Lingual extension clasp
    • Ball clasp
adam s clasp
Adam’s Clasp
  • The most useful clasp in removable appliances.
  • It is designed to engage the MB, DB undercuts of posterior teeth.
  • Advantage, it does not separate teeth and has excellent retention.
fabrication of adam s clasp
Fabrication of Adam’s Clasp
  • Components of Adam’s Clasp
  • 1- Arrow heads
  • 2- Bridge
  • 3- Tags
  • 4- Retentive parts
  • It is made of 0.7 mm diameter hard St. round wire
adam s clasp1
Adam’s Clasp
  • Design modifications

Long bridge

One arrow head

Solder a HG tube to the bridge

Solder hook to he bridge

adjustment of adam s clasp
Adjustment of Adam’s clasp
  • 1. To tighten/loosen: Adjust the arrowhead to grip the undercut of the tooth. Hold arrowhead with pliers at A and bend using finger inwards in direction shown.
slide7
2. To adjust the height: Hold adams clasp wire the wire exits the acrlyic at pint B and bend the wire up or down to adjust verical position of arrowhead.
retentive component
Retentive component
  • Circumferential clasp
    • Useful for second molars and canines
    • Easier to keep it out from occlusal contact
    • It is only supportive, not as retentive as Adam’s clasp
    • It can be adequate for a retainer, but not for an active appliance
retentive component1
Retentive component
  • Ball Clasp
    • It like Adam, extends across the embrasure
    • Uses buccal undercuts for retention
    • Easy to fabricate
    • It is stiff that could not be extended deep into the undercuts
retentive component2
Retentive component
  • Lingual Extension Clasp
    • It works only from the lingual aspect without crossing the occlusal surface or embrasures
    • Short loop of (0.4 mm) wire
    • Can be placed in the first molar second premolar lingual embrasure
    • Difficult to adjust
    • Break easily
    • May cause tissue irritation
    • Can separate teeth if active
    • Can be used for retainers,
    • not for active appliance
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