LECTURE 14: SUPPORT FOR THE DISTAL EXTENSION DENTURE BASE

Question 1

does not have the advantage of total tooth support

Answer 1

DISTAL EXTENSION RPD

Question 2

→ dependent on residual ridge for support, stability, and retention

Answer 2

DISTAL EXTENSION RPD

Question 3

indirect retention is needed to avoid lifting away from ridge

Answer 3

DISTAL EXTENSION RPD

Question 4

Which factor primarily affects the support of a distal extension base by providing a stable foundation?
• A. Contour and quality of the residual ridge
• B. Type of impression material used
• C. Occlusal height
• D. Position of the adjacent teeth

Answer 4

A

Question 5

What is the significance of the extent of residual ridge coverage by the denture base in supporting a distal extension?
• A. It provides aesthetic appeal only.
• B. It enhances stability and support for the denture.
• C. It affects only the comfort, not the support.
• D. It is unrelated to support.

Answer 5

B

Question 6

How does the accuracy of impression registration impact the support of a distal extension base?
• A. It has no impact on support.
• B. It affects the fit and stability of the denture base.
• C. It only affects the color of the denture.
• D. It affects only the durability of the denture material.

Answer 6

B

Question 7

Which of the following factors involves creating a proper, tight fit for the denture base to enhance support?
• A. Type of impression material used
• B. Accuracy of the fit of the denture base
• C. Design of the denture framework
• D. Residual ridge quality

Answer 7

B

Question 8

Why is the design of the removable partial denture framework important for distal extension support?
• A. It determines the color of the denture.
• B. It has no effect on denture support.
• C. It affects the stability and support of the denture.
• D. It only affects the comfort of the denture.

Answer 8

C

Question 9

What role does total occlusal load play in supporting a distal extension base?
• A. It only affects the appearance of the denture.
• B. It determines the color of the denture material.
• C. It has no influence on support.
• D. It impacts the pressure and distribution on the denture base.

Answer 9

D

Question 10

broad

A. Contour (Crest)
B. Quality (Connective Tissue)

Answer 10

A

Question 11

rounded

A. Contour (Crest)
B. Quality (Connective Tissue)

Answer 11

A

Question 12

high vertical slopes

A. Contour (Crest)
B. Quality (Connective Tissue)

Answer 12

A

Question 13

→ firm
→ dense

A. Contour (Crest)
B. Quality (Connective Tissue)

Answer 13

B

Question 14

fibrous

A. Contour (Crest)
B. Quality (Connective Tissue)

Answer 14

B

Question 15

Pre-extraction

A. Order 1
B. 2
C. 3
D. 4
E. T
F. 6

Answer 15

A

Question 16

Post-extraction

A. Order 1
B. 2
C. 3
D. 4
E. T
F. 6

Answer 16

B

Question 17

High, well-rounded

A. Order 1
B. 2
C. 3
D. 4
E. T
F. 6

Answer 17

C

Question 18

Knife-edge

A. Order 1
B. 2
C. 3
D. 4
E. T
F. 6

Answer 18

D

Question 19

Low, well-rounded

A. Order 1
B. 2
C. 3
D. 4
E. 5
F. 6

Answer 19

E

Question 20

Depressed

A. Order 1
B. 2
C. 3
D. 4
E. 5
F. 6

Answer 20

F

Question 21

T/f

crest of bony mandibular ridge is cancellous

Answer 21

T

Question 22

T/f

loss of firm mucosa over residual ridge after tooth extraction

Answer 22

T

Question 23

T/f

buccal shelf region is better suited for secondary stress-bearing role

Answer 23

F

buccal shelf region is better suited for primary stress-bearing role

Question 24

The tissues covering the crest of the maxillary residual ridge must be less ____ than the tissues that cover palatal areas, or relief of palatal tissues must be provided in the denture bases or for palatal major connectors

Answer 24

displaceable

Question 25

T!f

The gum on the upper ridge should be firmer than the roof of the mouth. This way, the dentures stay stable.

Answer 25

T

Question 26

T(/f

the broader the residual ridge coverage, the greater is the distribution of the load, which results in less load per unit area

Answer 26

T

Question 27

not supporting occlusal load

A. Anatomic Form
B. Functional Form

Answer 27

A

Question 28

supporting load

A. Anatomic Form
B. Functional Form

Answer 28

B

Question 29

most physiologic form for denture suppor

A. Anatomic Form
B. Functional Form

Answer 29

A

Question 30

When making dentures, the shape of the gum ridge (the area where teeth used to be) can look different depending on how it’s measured. When some pressure is applied-like from biting, pushing with a finger, or using a custom tray–the ridge shape under that load is called the

A. Anatomic Form
B. Functional Form

Answer 30

B

Question 31

The difference between these forms depends on how thick or soft the gum tissue is and how much pressure is put on it. To make dentures that fit well, some methods record this “functional form” to capture how the ridge behaves under normal chewing or speaking pressure. This approach, called a___

Answer 31

functional impression

Question 32

ensures the denture base fits better under real-life conditions

Answer 32

functional impression

Question 33

requirements of distributed stress denture:

Answer 33

o positive-occlusal rests
o rigid and nonflexible framework
o indirect retainers
o well-adapted and broad coverage bases

Question 34

Steffel’s categories of managing distal extension RPDs:

Answer 34

o stress-breakers or resilient equalizers
o physiologic basing
o stress distribution

Question 35

T/f

distal extension is enhanced by close contact of tissue surface and residual ridge tissue

Answer 35

T

Question 36

T/f

denture base must be related to the RPD framework as basal seat tissues to the abutment teeth when impression was made

Answer 36

T

Question 37

the greatest movement takes place at the most posterior extent of the denture base, where in mandi and maxi?

Answer 37

Mn = retromolar pad

Mx = tuberosity

Question 38

___ have suggested that moving rotational axis from a disto-occlusal rest to a more anterior location, more of the residual ridge receives vertically directed occlusal forces to support the denture base.

Answer 38

Steffel and Kratochvil

Question 39

T/f

patients with distal extension removable partial dentures generally orient the food bolus over natural teeth rather than prosthetic teeth

Answer 39

T

Question 40

T/f

the reduction of the size of the occlusal table reduces the vertical and horizontal forces that act on the removable partial dentures and lessens the stress on the abutment teeth and supporting tissues

Answer 40

T

Question 41

T/f

the objective of any functional impression technique is to provide maximum support for the RPD base

Answer 41

T

Question 42

ANATOMIC FORM IMPRESSION

Answer 42

(1) Anatomic Form Impression
(2) Rest and Base Fit
(3) Load Distribution
(4) Tissue Load Bearing
(5) Load Distribution Importance
(6) One-Stage Impression Risks
(7) Individualized Impression Tray
(8) Reline Considerations
(9) Distribution of Masticatory Load

Question 43

impression requirements for providing adequate support to the distal extension RPD base:

Answer 43

o records and relates the supporting soft tissue under some loading

o distributes the load over as large an area as possible

Question 44

T/f

SELECTIVE TISSUE PLACEMENT IMPRESSION METHOD

the tissues in the back of the mouth, near the vibrating line, can be slightly pushed down to create a good seal for the upper denture without causing harm

Answer 44

T

Question 45

T/f

the framework fitted to the teeth while soft tissue support is registered provides a means of coordinating both this means that before the trays are attached, the framework must be fitted in the mouth

Answer 45

T

Question 46

used when the mucosa of the residual ridge feels uniformly firm

Answer 46

FUNCTIONAL IMPRESSION TECHNIQUE

Question 47

→ captures the shape and position of the tissue while the patient bites down, simulating the effects of chewing forces

→ when this technique is applied to firm mucosa that doesn’t easily displace, it results in minimal movement of the prosthesis

Answer 47

FUNCTIONAL IMPRESSION TECHNIQUE

Question 48

T/f

while the selective pressure technique can be used for various types of residual ridges because it adapts to different mucosal conditions, the functional impression technique is more limited and best suited for uniformly firm ridge consistency

Answer 48

T

Answer 49

A