RPD Component Overview

Question 1

An RPD is a dental prosthesis that restores _______ of the natural teeth and/or associated parts and is supported by teeth and/or mucosa and can be removed from the mouth and replaced at will

Answer 1

One or more but not all

Question 2

What are the objectives of an RPD? (6)

Answer 2

1. Restore anatomical defect
2. Restore function
3. Restore occlusal plane
4. Proved posterior occlusal support
5. Improve esthetics
6. Splint periodontally compromised teeth

Question 3

List the components of the metal framework portion of an RPD: (5)

Answer 3

1. major connector
2. minor connectors
3. rests
4. direct retainers
5. indirect retainers

Question 4

List the components of the denture base portion of an RPD: (2)

Answer 4

1. replacement teeth
2. supporting base material

Question 5

Label the parts of the RPD in the following image:

Answer 5

A) proximal plate
B) minor connector
C) proximal plate
D) denture base connector
E) major connectors
F) rest
G) retainer

Question 6

The component of an RPD that joins the units on one side of the dental arch with units on the opposite side:

Answer 6

Major connector

Question 7

The following images show:

Answer 7

Major connector

Question 8

List types of major connectors in a maxillary RPD: (4)

Answer 8

1. palatal strap
2. anterio-posterior palatal strap
3. complete palate
4. U-shaped (horseshoe) connector

Question 9

List the type of major connectors in na mandibular RPD: (2)

Answer 9

1. Lingual bar
2. Lingual plate

Question 10

The connecting link between the major connector or base of an RPD and the other units of the prosthesis, such as direct and indirect retainers and rests:

Answer 10

Minor connector

Question 11

List the three types of minor connectors in an RPD:

Answer 11

1. Guiding plane plates
2. Meshwork - to hold acrylic resin
3. Any unit connecting any type of rest to the major connector

Question 12

What type of major connector is seen in the following image of a mandibular RPD?

Answer 12

Lingual bar

Question 13

What type of major connector is seen in the following image of a mandibular RPD?

Answer 13

Lingual plate

Question 14

A component of an RPD that serves to transfer forces occurring against the prosthesis down the long axis of the abutment teeth:

Answer 14

Rest

Question 15

The prepared surface of a tooth or restoration to receive the rest, not a part of framework:

Answer 15

Rest seat

Question 16

A rigid extension from the major connector or base; contacts the proximal surface of an abutment tooth:

Answer 16

Proximal plate

Question 17

What component of the RPD is represented by the arrow in the following image?

Answer 17

Proximal plate

Question 18

A component of an RPD used to retain & prevent dislodgment:

Answer 18

Direct retainers

Question 19

Two arms or other pieces, joined by a body which may connect a rest; may act as a retainer or stabilizer:

Answer 19

Direct retainer- clasp assembly

Question 20

A component of an RPD that assists a direct retainer(s) in preventing displacement of distal extension denture base by functioning through lever action on the opposite side of the fulcrum line:

Answer 20

Indirect retainers

Question 21

Usually connects to a major connector and is some form of rest:

Answer 21

Indirect retainers

Question 22

Indirect retainers are ALWAY necessary in:

Answer 22

Class I or II situations

Question 23

Part of the RPD that rests on the foundation tissues and to which teeth are attached:

Answer 23

Denture base

Question 24

The denture base component of the RPD may be _____ or _____

Answer 24

Polymer/plastic or metal

Question 25

The part of the RPD which rests on the oral mucosa and to which the teeth are attached:

Answer 25

Acrylic resin attachment

Question 26

What is the function of the acrylic resin attachment component of an RPD?

Answer 26

Transmit stress to the supporting structures

Question 27

Part of the framework to which the resin base is attached:

Answer 27

Retention

Question 28

What are the two types of retentions seen in RPDs?

Answer 28

1. Lattice
2. Mesh

Question 29

The denture teeth in an RPD may be:

Answer 29

1. Plastic
2. Porcelain
3. Metal