Clasp Assembly The part of a removable dental prosthesis that acts as a direct retainer and/or stabilizer for a prosthesis by partially encompassing or contacting an abutment tooth. …
Which type of rest acts indirect retainer?
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.
Is lingual plate an indirect retainer?
Technically, continuous bar retainers and lingual plates are not indirect retainers since they rest on unprepared lingual inclines of anterior teeth. The indirect retainers are actually the terminal rests at either end in the form of auxiliary occlusal rests or canine rests.
What is indirect retention dentures?
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 is denture base?
DEFINITION. A denture base is that part of a denture which rests on the foundation areas and to which teeth are attached.
What is Ante's law?
Ante’s law states that “the total periodontal membrane area of the abutment teeth must equal or exceed that of the teeth to be replaced.”1 For more than 80 years, this law has been taught in standard textbooks of prosthodontics as an important condition influencing FDP design.
How many direct retainers are there?
Two basic types of direct retainers are available: the intracoronal retainer and the extracoronal retainer.
What is auxiliary occlusal rest?
20. AUXILIARY OCCLUSAL REST Most frequently used. Located on the occlusal surface far away from distal extension denture base. It is placed perpendicular to the midpoint of the fulcrum line. Ideal location is central incisor, which is weak, therefore bilateral rests on first premolars are effective.What is auxiliary rest in RPD?
A rest that is responsible for additional support or indirect retention is called an auxiliary rest or secondary rest. 21. Primary rests prevent vertical movement of a prosthesis toward the tissues and also help transmit applied forces to the supporting teeth.
Is proximal plate indirect retainer?The proximal plates, adjacent to the edentulous areas, also provide indirect retention. Although it is customary to identify the entire assembly as the indirect retainer, it should be remembered that the rest is actually the indirect retainer united to the major connector by a minor connector.
Article first time published onWhat is combination syndrome for dentures?
Combination syndrome (CS) is defined as “a condition caused by the presence of the lower anterior teeth and the absence of the posteriors and resulting in significant maxillary anterior alveolar resorption.”1 This condition often develops in cases of a complete maxillary denture opposing a bilateral distal extension …
What is cast partial denture?
Cast partial denture is a type of partial denture comprising a cast metal framework with acrylic resin prosthetic teeth. Traditional acrylic partial dentures are less durable, retentive, and stronger than cast partial dentures.
What is retainer in prosthodontics?
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 is a fulcrum line?
Fulcrum line. An imaginary line around which a removable partial denture tends to rotate. Synonym: rotational axis.
What are abutment teeth?
When your dentist installs your dental implant, the metal part that serves as a base for the crown is known as an abutment. It serves solely as a connector with one part attached to your jawbone, while the crown is fitted on the other end.
What is acrylic base denture?
The acrylic denture base is normally fabricated in a two-part gypsum mould. The mould is produced by investing wax trial dentures on which the artificial teeth have been mounted. After ‘boiling out’ of the wax the gypsum mould is treated with an alginate mould-sealing agent.
What kind of fake teeth are there?
- Dental Implants. Dental implants are a permanent solution for tooth loss. …
- Implant-retained Dentures. This is a stable type of denture that connects to titanium abutments implanted in the jaw’s bony tissue. …
- A Fixed Bridge. …
- Full Dentures. …
- A Partial Denture.
What is a free end partial denture?
This new free-end removable partial denture design can be used for patients who require a combined tixed-remov- able prosthesis. This system provides retention, bracing, and support for distal extension partial dentures with minimal damage to the abutment teeth and the supporting tissues.
What is the function of a rest on a partial denture?
Thus rests serve to support the position of a partial denture and to resist movement toward the tissue. They serve to transmit vertical forces to the abutment teeth and to direct those forces along the long axes of the teeth.
How do you cast a partial denture?
This simple and systematic designing procedure consists of six major steps, that must be remembered and followed in this manner: (1) rests, (2) minor connectors and proximal plates, (3) retentive meshwork, (4) major connector, (5) direct retainers, and (6) indirect retainers.
What is telescopic crown?
The telescopic crown is defined as an artificial crown fabricated to fit over a coping (1). Telescopic crowns have been used mainly in removable dental prostheses (RDP) to connect the dentures to the remaining dentition (2, 3).
What is Christensen phenomenon?
[C. Christensen, Danish dentist and educator] A gap occurring in the natural dentition or between the opposing posterior flat occlusal rims when the mandible is protruded (posterior open bite). It can lead to instability in full dentures unless compensating curves are incorporated into the dentures.
What is Pericemental area?
Medical Definition of pericemental 1 : around the cement layer of a tooth. 2 : of, relating to, or involving the periodontal ligament.
What is distal extension RPD?
Movements of a Distal Extension RPD Rotation of the prosthesis around a fulcrum line passing through the two principal occlusal rests of the direct retainer or through the points where the minor connectors adjacent to the edentulous area break contact with the tooth surface.
What is pier abutment?
Pier abutment, also named inter- mediate abutment, is defined by the Glossary. of Prosthodontic Terms as a natural tooth. located between terminal abutments that. serve to support a fixed or removable dental.
What is the name of tooth rest?
1. Occlusal rests—so named because they are seated on the occlusal surfaces of posterior teeth. 2. Lingual or cingulum rests—those seated on the lingual surfaces of anterior teeth, usually maxillary canines.
What is minor connector?
A MINOR CONNECTOR is the connecting link between the major connector or base of a RPD and the other units of the prosthesis, such as clasps, indirect retainers, and occlusal rests. 1. Minor connectors join. the major connector with other parts of the RPD. 2.
What is the rest seat?
A REST PREPARATION or REST SEAT is any portion of a tooth or restoration properly prepared to receive a rest.
What is closest speaking space?
The space between the lower centric occlusion line and the upper closest speaking line is called the closest speaking space.
How is an overdenture supported in the mouth?
An overdenture, as its name implies, is designed to go over a supporting structure. This could be natural teeth, but more often dental implants are used. In the upper jaw, the supporting structure for an overdenture is generally a metal frame anchored by three or more implants.
What is the purpose of taking the bite and occlusal registrations for partial dentures?
Taking a jaw registration has been found to facilitate the achievement of optimum occlusal and mucosal support, as well as minimising clinical and technical errors in partial dentures.
