Direct Retainers Part I

Question 1

RPD retention resists:

Answer 1

dislodging forces

Question 2

Mechanical retention from retaining elements on abutment teeth:

Answer 2

primary retention

Question 3

Retention due to the intimate contact of minor connector with guide planes

Answer 3

secondary retention

Question 4

Retention due to intimate contact of denture base & maxillary major connector with underlying tissue:

Answer 4

secondary retention

Question 5

RPD component used to retain and prevent dislodgment:

Answer 5

direct retainer

Question 6

direct retainer with internal precision attachment: key/ keyway

Answer 6

intracoronal

Question 7

What type of direct retainer is most esthetic?

Answer 7

intracoronal

Question 8

What are the disadvantages to an intracoronal direct retainer?

Answer 8

require crown, complex fabrication, & high maintenance

Question 9

Direct retainer with clasp assembly:

Answer 9

extracoronal

Question 10

What type of direct retainer is most commonly used?

Answer 10

extracoronal

Question 11

Clasp types include:

Answer 11

1. suprabulge
2. infrabulge

Question 12

What are the two types of direct retainers?

Answer 12

1. intracoronal
2. extracoronal

Question 13

This image shows a:

Answer 13

intracoronal direct retainer

Question 14

This image show a:

Answer 14

extra coronal direct retainer

Question 15

What type of clasp is shown?

Answer 15

suprabulge

Question 16

What type of clasp is show?

Answer 16

infrabulge

Question 17

Clasp type:

• retentive arm approaches undercut from above the survey line

Answer 17

suprabulge

Question 18

Clasp type:

• retentive arm approaches undercut from below survey line
• contains bar clasps

Answer 18

infrabulge

Question 19

Circumferential, Akers, and Circlet are all synonyms for what clasp type?

Answer 19

suprabulge

Question 20

What clasp type contains bar clasps?

Answer 20

infrabulge

Question 21

From top to bottom the parts of the supra-gingival clasp assembly include:

Answer 21

1. rest
2. reciprocal clasp
3. retentive clasp
4. proximal plate

Question 22

Label the types of clasps seen in the following image:

Answer 22

top: suprabulge
bottom: infrabulge

Question 23

A properly constructed suprabulge or infrabulge clasp assembly must incorporate the following components:

Answer 23

1. Rest
2. Retentive clasp
3. Reciprocal element
4. One or more minor components

Question 24

Label the following parts of the clasp assembly:

Answer 24

A: retentive clasp arm
B: rest
C: minor connector
D: reciprocal arm

Question 25

Label the parts of the image:

Answer 25

A: Direct Retainer B: Direct Retainer C: Reciprocal Plate D: Reciprocal Arm E: Rest

Question 26

Clasp assembly component that lies on occlusal, lingual, and incisal surface, that prevents tissue ward movement of clasp:

Answer 26

Rest

Question 27

Label the types of rests shown: (from left to right)

Answer 27

1. occlusal rest 2. cingulum chevron rest 3. lingual ball rest 4. incisal rest

Question 28

What is the function of the rest? (component of clasp assembly)

Answer 28

prevents tissue ward movement of clasp

Question 29

- rigid component - above heigh of counter - reciprocal clasp - lingual plate - proximal plate - guide plate (minor connectors)

Answer 29

Reciprocal components

Question 30

The retentive clasp arm is located in the:

Answer 30

proximal 2/3

Question 31

Retentive clasp arm is the ___ portion

Answer 31

rigid portion

Question 32

The retentive terminal is located in the:

Answer 32

distal 1/3

Question 33

The retentive terminal can be described as:

Answer 33

flexible

Question 34

The retentive terminal is ____ the height of contour

Answer 34

below

Question 35

The retentive clasp arms are located ___ the height of contour

Answer 35

above

Question 36

What provides direct retention? (retentive terminal or retentive clasp arm)

Answer 36

retentive terminal

Question 37

What type of retention is provided by the retentive terminal?

Answer 37

direct

Question 38

clasp assembly component that joins the body of clasp to framework:

Answer 38

minor connector

Question 39

The minor connector can be described as:

Answer 39

rigid

Question 40

This image is showing the:

Answer 40

minor connector

Question 41

Component of the bar clasp that connects the clasp to framework:

Answer 41

approach arm

Question 42

The 6 requirements of clasp assembly include:

Answer 42

1. support 2. stability 3. encirclement of MORE THAN 180 degrees 4. reciprocation 5. passivity 6. retention

Question 43

What component of clasp assembly is involved with support?

Answer 43

rests

Question 44

Requirement of clasp assembly that resists vertical movement toward tissue:

Answer 44

support

Question 45

Support resists ____ movement toward ____.

Answer 45

vertical movement toward tissue

Question 46

Requirement of clasp assembly that resists horizontal displacement:

Answer 46

stability

Question 47

What components of clasp assembly are involved with "stability"?

Answer 47

all rigid components of direct retainer

Question 48

Requirements of clasp assembly (STABILITY)