removable pros

Question 1

What is the difference between the terms denture bearing area and denture base?

Answer 1

denture bearing area: the hard supporting tissues that the denture covers

denture base: usually the acrylic part of the denture, that rests on the denture bearing areas

Question 2

What is the definition of ‘Support’?

Answer 2

The resistance of a denture to vertical displacement/forces that are directed towards the tissues

Question 3

Define Retention

Answer 3

Retention is the ability of a denture to resist vertical displacement away from the denture bearing areas whilst at rest.

Question 4

Define Stability

Answer 4

The ability of a denture to resist movement, in any direction, in relation to underlying bone during function

Question 5

What six factors does retention of a complete denture depend on?

Answer 5

• adhesion between saliva and denture base
• surface area covered by denture base
• adaptation of the denture to underlying tissues
• border seal around edge of denture - suction
• muscular control by tongue and cheek
• gravity for lower

Question 6

In a denture, which is the main component that provides support?

a) clasps
b) rests
c) saddle
d) major connectors
e) minor connectors

Answer 6

b) rests

Question 7

What three things does support in a denture provide?

Answer 7

• Reduces movement on loading
• Reduces trauma to tissues
• Improves distribution of loading

Question 8

True or false;

Any part of the denture which sits on the bearing tissues will provide support

Answer 8

TRUE

Question 9

Which statement regarding rests in dentures is incorrect?

a) Transmits occlusal forces to teeth along their transverse axes
b) maintains correct occlusal relationship of the denture base to the abutment teeth
c) prevents trauma to gingiva
d) provides some lateral stability
e) prevents food packing between abutment teeth and denture base

Answer 9

a) Transmits occlusal forces to teeth along their transverse axes

Transmits occlusal forces to teeth along their LONGITUDINAL axis

Question 10

Name four types of rests in a denture

Answer 10

• Occlusal
• Cingulum
• Incisal
• Ring

Question 11

What are the rationales for Rest seat preparations in abutment teeth for RPDs?

Answer 11

• To provide space between the occlusal surfaces of the upper and lower teeth to allow an adequate thickness of the metal
• Provide more suitably inclined bearing surfaces for rests
• Provide a shape of surface giving a desirable amount of bracing

Question 12

True or False;

The path along which a RPD is least likely to be displaced is at right angles to the occlusal surfaces of the teeth.

Answer 12

FALSE

The path along which a RPD is MOST likely to be displaced is at right angles to the occlusal surfaces of the teeth.

Question 13

Which statement concerning denture components is incorrect?

a) Clasp tips undergo elastic deformation as denture is removed
b) Mucosa-Borne dentures refer to denture resting solely on the mucoperiosteum.
c) The main component of a denture that provide support is the rest
d) The reciprocal arm of a clasp stays in contact with the tooth below the survey line
e) the further away an indirect retainer is from the clasp, the more efficient it is

Answer 13

d) The reciprocal arm of a clasp stays in contact with the tooth below the survey line

the reciprocal arm of a clasp is ABOVE the survey line

Question 14

Which denture types need to have an indirect retention designed into them?

Answer 14

Free end saddle dentures (Kennedy class 1 and 2) and kennedy class 4