Direct Retainers

Retention

Intracoronal attachments

Extracoronal attachments

Direct Retainers (Clasp retainers)

Requirements of Direct Retainers

Requirements of Direct Retainers

Factors affecting The Magnitude of Retention

Magnitude of Retention

Direct Retainer Selection

Direct Retainers for Tooth-Borne RPD’s

Occlusally approaching clasps

1-Aker’s clasp (Circlet clasp)

5- Multiple Clasp

7- Half & Half clasp

10- Back action clasp

Tooth-Borne Direct Retainers

Stress-Releasing Direct Retainers

Non-Stress-Releasing Direct Retainers

Infrabulge (Bar) Clasps

Infrabulge (Bar) Clasps

Contraindications

1 - RPI Clasp

Bar Clasp with Mesial Rest alternative

2- RPA Clasp

3- Combination Clasp

Clasps with splinting action

Thank you