What is an indirect retainer

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. … Most frequently, indirect retainers are placed on canines or the mesial fossa of first premolars.

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.

Are rests indirect retainers?

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.

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 are direct retainers?

A direct retainer is any unit of a removable dental prosthesis that engages an abutment tooth or implant to resist displacement of the prosthesis away from basal seat tissue.

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 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 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.

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What is Ante's law?

In dentistry, Ante’s law is a postulate about crown-to-root ratio put forth by Irwin H. Ante in a thesis paper he wrote in 1926. 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.“

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.

Which Kennedy design must include indirect retainer?

All Kennedy Class I, Class II, and long span Class IV removable partial dentures require effective indirect retention.

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 a partial denture retainer?

A flipper tooth is a removable retainer that fits along the roof of your mouth (palate) or sits on your lower jaw, and has one or more prosthetic teeth attached to it. When you put it in your mouth, it creates the appearance of a full smile, even if you’ve lost teeth due to injury, removal, or decay.

What is Kennedy classification?

Definition. A system developed by Dr. Edward Kennedy for classification of edentulous jaw conditions and partial dentures, based on the distribution of edentulous spaces. Class I is bilateral free-end saddles. Class II is a unilateral free-end saddle.

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 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?

13.1 Introduction. The denture base is that part of the denture which rests on the soft tissues and so does not include the artificial teeth. … 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.

What is the Retromolar pad?

The retromolar pad is a mass of soft tissue located at the posterior end of the mandibular alveolar ridge. This pad covers the underlying bone with surrounding attached muscle fibers. … After the loss of molars the bony alveolar process and surrounding soft tissues remodels, resorbs and blends with retromolar pad [2].

What is the buccal shelf?

buc·cal shelf (bŭkăl shelf) Broad flat surface of the posterior mandible buccal to the teeth or alveolar ridge that provides denture support.

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 denture stomatitis caused by?

Denture stomatitis (or oral stomatitis) is usually caused by candida — a type of fungus (yeast). It’s normal to have small amounts of candida in your mouth. But when there’s an imbalance, the candida can grow out of control, resulting in a fungal infection.

Can you eat with a partial denture?

In short, when answering the question of ‘can you eat with partial dentures? ‘ the answer is: yes, you absolutely can. But there may be a period of adjustment as you get used to the new feeling in your mouth.

What kind of dental partials are there?

• Cast Metal Removable Partial Denture. The most common type of removable partial denture consists of high-quality replacement teeth on a rigid cast metal frame. …
• Acrylic Removable Partial Denture (Flipper) …
• Flexible Partial Denture. …
• Fixed Bridge. …
• Implant-Supported Fixed Bridge.

Can teeth be added in cast partial denture?

Can I add teeth to my existing partial denture? The short answer is in most cases, yes. Your mouth is a dynamic environment. Like your body, change is constant due to various factors including the ageing process, normal wear and tear and sometimes because of unforeseen accidents or illness.

How deep should rest seats be?

An incisal rest seat should appear as a small, V-shaped notch located approximately 1.5 to 2.0 mm from the proximal-incisal angle of the tooth. The deepest part of the preparation should be toward the center of the tooth mesiodistally.

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.

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).