RETENTIVE AREAS
- RETENTION -
is the property of the clasp that resists dislodgement of the prosthesis from the tooth in an occlusal direction.
Retentive area…..
- It is this infrabulge area or the undercut area that is used for the placement of the retentive clasp component
- 3 dimensions –
- Mesiodistal dimension
- Occlusogingival dimenson
- Buccolingual dimenson
- Clasp is retentive when
- Positioned on the surface of the tooth that is cervical to the greatest circumference of the tooth
- Resists distortion that is required for the clasp arm to escape from the area beneath the bulge of the tooth
- PATH OF DISPLACEMENT
is the direction in which the denture tends to be displaced in function. This is at right angles to the occlusal plane
q Retentive undercuts must be present on the abutment teeth when the cast displays a horizontal tilt.
q Changing the tilt to produce undercut is just an illusion
q Only when the undercut is verified on the horizontal survey , the tilt can then be changed to optimize the undercut on any tooth.
q If retentive undercuts are not present they should be created
q By recontouring of enamel
q Cast restorations
1 comments:
Hey!! You're doing a good job really...
Where to contact you?
Please visit our blog and leave a reply there...
de'Montmorency College of Dentistry
Thanks a lot...
I be your junior in the same institution...
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