What are indirect retainer RPD?
An indirect retainer consists of a minor connector and a rest, and helps to stabilize the distal extension RPD, indirectly (compared to direct retention with clasps), when the patient eats sticky foods. The indirect retainer is located on the opposite side of the retentive fulcrum line from the mucosa supported base.
Which type of rest acts indirect retainer?
occlusal rest
If the occlusal rest on the secondary abutment lies far enough from the fulcrum line, it may serve as an indirect retainer. Its dual function then is tooth support for one end of the modification area and support for an indirect retainer.
What is retainer in partial denture?
Direct retainers are flexible parts of the casting that are designed to engage undercuts on the abutment teeth to resist removal of the prosthesis and to help prevent dislodgement.
Is Cingulum rest an indirect retainer?
An occlusal rest is the preferred component for indirect retention. Because of its location and orientation, an occlusal rest permits forces to be directed within the long axis of the corresponding abutment. Cingulum rest (Canine rest);
What is indirect retention in partial denture?
A secondary fulcrum line is usually established when partial denture design includes indirect retention. Indirect retention prevents the retentive clasp tips from becoming a fulcrum about which the prosthesis could rotate when forces move the denture base away from the tissue.
What are direct retainers?
DEFINITIONS. RETENTION is resistance to movement of a denture away from the teeth and/or tissues along the path of placement of the prosthesis. Most retention of RPDs is provided by DIRECT RETAINERS which are clasp assemblies or attachments applied to an abutment tooth to retain an RPD in position.
What are the components of a removable partial denture?
The four basic components involved in an RPD are the artificial teeth, the denture base, retainers, and connectors (Figure 3.17).
What is direct retainer?
DEFINITIONS Direct retainer: That component of a removable partial denture used to retain and prevent dislodgment, consisting of a clasp assembly or precision attachment Direct retention : Retention obtained in a removable partial denture by the use of clasps or attachments that resist removal from the abutment teeth 5.
Why are indirect retainers important to the RPD?
Indirect retainers provide additional support and distribute the forces of occlusion over a larger number of abutment teeth for the RPD. Additional stabilization of the RPD against horizontal forces can be provided by indirect retainers. The indirect retainers help prevent the major connector from being
What is a direct retainer in a denture?
Direct retainer: It is that component of a removable partial denture that is used to retain and prevent dislodgment, consisting of a clasp assembly or a precision attachment (GPT 8) 4. Direct retainers Intracoronal Extracoronal Precision Semi-precision Extracoronal Clasps Attachment
When to use a removable partial denture ( RPD )?
Removable partial denture(RPD): A partial denture that can be removed and replaced in the mouth by the patient. 3. Interim denture(provisional; temporary): A denture used for a short interval of time to provide: a. esthetics, mastication, occlusal support and convenience. b. conditioning of the patient to accept the final prosthesis. 4.
What do retainers, clasp assemblies and indirect retainers do?
4. Retainers, Clasp Assemblies and Indirect Retainers Clasp assembly The part of a removable partial denture that acts as a direct retainer (clasp) and/or stabilizer (minor connectors, proximal plates etc) for a prosthesis by partially encompassing an abutment tooth 5.