Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

rpd > lec 10 > Flashcards

lec 10 Flashcards

1
Q
  • No advantage of tooth support
A

DISTAL EXTENSION (distal free-end)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

DISTAL EXTENSION Must depend on - ___________ for some support, stability, and retention

A

residual ridge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

to prevent the denture from lifting away from the residual ridge (should also be incorporated in the design)

A
  • Indirect retention
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
  • The tooth-supported base is__________ at either end by the action of a direct retainer and is supported at either end by a rest - ____________________ is lacking in the distal extension prosthesis.
A

secured
degree of support and direct retention

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

FACTORS INFLUENCING THE SUPPORT OF A DISTAL EXTENSION BASE (6)

A
  1. Contour and quality of the residual ridge
  2. Extent of residual ridge coverage by the denture base
  3. Type and accuracy of the impression registration
  4. Accuracy of the fit of the denture base
  5. Design of the removable partial denture framework
  6. Total occlusal load applied.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q
  • The ideal residual ridge to support a denture base would consist of ___________ that covers relatively dense cancellous bone, with a broad rounded crest with high vertical slopes, and is covered by firm, dense, fibrous connective tissue.
A

cortical bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
  • ____________ will not adequately support a denture base, and tissues that are interposed _______________ and a denture base will not remain in a healthy state.
A

Easily displaceable tissue
between a sharp, bony residual ridge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q
  • The crest of the bony mandibular residual ridge is most often _________.
A

cancellous

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q
  • The ___________________ (bounded by the external oblique line and the crest of the alveolar ridge) seems to be better suited for a primary stressbearing role because it is covered by relatively firm, dense, fibrous connective tissue supported by cortical bone.
A

buccal shelf region

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q
  • The surface contour of the ridge when it is not supporting an occlusal load.
A

ANATOMIC FORM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q
  • The residual ridge is the surface contour of the ridge when it is supporting a functional load.
A

FUNCTIONAL FORM

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

the form of the residual ridge recorded under some loading, whether by occlusal loading, finger loading, specially designed individual trays, or the consistency of the recording medium.

A

functional form

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

 Records the ridge relation under simulated function.

A

FUNCTIONAL IMPRESSION

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Steffel has classified advocates of the various methods for treating the distal extension removable partial denture as follows:
1. Those who believe that ridge and tooth supports can best be equalized by _______________________.
2. Those who insist on bringing about the equalization of ridge and tooth support by ___________, which is accomplished by a pressure impression or by relining of the denture under functional stresses.
3. Those who uphold the idea of _________________ for stress reduction at any one point.

A

the use of stress-breakers or resilient equalizers
physiologic basing
extensive stress distribution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q
  • Support of the distal extension base is enhanced by intimacy of contact of the tissue surface of the base and the tissues that cover the residual ridge.
  • The tissue surface of the denture base must optimally represent a true negative of the basal seat regions of the master cast.
A

ACCURACY OF THE FIT OF THE DENTURE BASE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q
  • Some rotation movement of a distal extension base at the distal abutment is inevitable under functional loading.
A

DESIGN OF THE REMOVABLE PARTIAL DENTURE FRAMEWORK

17
Q
  • It must be remembered that the extent to which abutments are subjected to rotational and torquing forces that result from masticatory function is directly related to the position and resistance of the food bolus.
A

DESIGN OF THE REMOVABLE PARTIAL DENTURE FRAMEWORK

18
Q
  • The greatest movement takes place at the most posterior extent of the denture base.
A

DESIGN OF THE REMOVABLE PARTIAL DENTURE FRAMEWORK

19
Q
  • Patients with distal extension removable partial dentures generally orient the food bolus over natural teeth rather than prosthetic teeth.
  • This has an effect on the direction and magnitude of the occlusal load to the removable partial denture and, thus, on the load transferred to the abutments.
A

TOTAL OCCLUSAL LOAD APPLIED

20
Q
  • This is best managed by reducing the occlusal plane irregularity and enhancing extension base stability through the use of a dental implant.
  • The number of artificial teeth, the width of their occlusal surfaces, and their occlusal efficiency influence it applied to the removable partial denture.
A

TOTAL OCCLUSAL LOAD APPLIED

21
Q
  • A one-stage impression method using an elastic impression material that will produce a cast that does not represent a functional relationship between the various supporting structures of the partially edentulous mouth. It will represent only the hard and soft tissues at rest.
A

ANATOMIC FORM IMPRESSION

22
Q
  • When a masticatory load is applied to the extension base(s) with a food bolus, the ________ will act as a definite stop, which will limit the part of the base near the abutment tooth from transmitting the load to the underlying anatomic structures.
A

rest(s)

23
Q
  • The ___________, however, that is able to move more freely, will transmit more of the masticatory load to the underlying extension base tissues and will transmit more torque to the abutment teeth through the rigid removable partial denture framework.
A

distal end of the base(s)

24
Q
  • The broader the residual ridge coverage, the greater is the distribution of the load, which results in less load per unit area.
  • A denture base should cover as much of the residual ridge as possible and should be extended the maximum amount within the physiologic tolerance of the limiting border structures or tissues.
A

EXTENT OF RESIDUAL RIDGE COVERAGE BY THE DENTURE BASE

25
Q
  • “Maximum coverage of denture-bearing areas with large, wide denture bases is of the utmost importance in withstanding both vertical and horizontal stresses.”
A

EXTENT OF RESIDUAL RIDGE COVERAGE BY THE DENTURE BASE

26
Q

METHODS FOR OBTAINING FUNCTIONAL SUPPORT FOR THE DISTAL EXTENSION BASE

A

(1) Selective Tissue Placement Impression Method
(2) Framework Fitting
(3) Functional Impression Technique

27
Q

Requirements for providing adequate support to the distal extension RPD base:

  1. That it ___________ the supporting soft tissue under some loading.
  2. That it _________ over as large an area as possible.
A

records and relates
distributes the load

28
Q

Oral tissues that have been overly displaced or distorted attempt to regain their anatomic form.

When they are not permitted to do this by the denture bases, the tissues become inflamed and their physiologic functions become impaired, accompanied by bone resorption.
A

SELECTIVE TISSUE PLACEMENT IMPRESSION METHOD

29
Q

Tissues that are minimally displaced (placed) by impression procedures for definitive border control respond favorably to the additional pressures placed on them by the resultant denture bases if these pressures are intermittent rather than continuous.

The tray is the most important part of an impression.
A

SELECTIVE TISSUE PLACEMENT IMPRESSION METHOD

30
Q

Fitting the framework involves the following steps:
1. Use of disclosing media to identify _________ to completely seating the removable partial denture framework.

  1. Use of disclosing media to identify the ___________________ of the framework during seating of the framework and when the framework is completely seated in its designated terminal position.
A

interferences
appropriate contact(s) of the component parts

31
Q

The _____________ of impression making is most commonly used for the mandibular distal extension partially edentulous arch (Kennedy Class I and Class II arch forms).

A

altered cast method

32
Q

______________ or “dynamic” impression method

A

“selected pressure”

33
Q
  • When the residual ridge mucosa demonstrates a uniformly firm consistency, an impression technique that involves capturing the tissue form while the patient is in occlusion can be considered.
A

FUNCTIONAL IMPRESSION TECHNIQUE

34
Q
  • Such a technique records the mucosal position and shape under the influence of a static closure force, similar to functional masticatory forces.
A

FUNCTIONAL IMPRESSION TECHNIQUE

35
Q
  • The ____________ can be applied to all varieties of residual ridges because it is customized to mucosal conditions, whereas the _____________ has limited application to a uniformly firm ridge consistency
A

selective pressure technique
functional impression technique

rpd (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions