Denture Design

Question 1

what are the different Craddock classifications and what is this?

Answer 1

type 1 - tooth borne
type 2 - mucosa borne
type 3 - both

• surface that takes biting force of denture

Question 2

what are the different Kennedy classifications and what happens when multiple saddles?

Answer 2

class 1 - bilateral free ended saddles 
class 2 - unilateral free ended saddle 
class 3 - posterior bounded saddle 
class 4 - anterior bounded saddle

use class of most posterior saddle and modification with number of other saddles i.e. Kennedy classification iii Modification 2

Question 3

components of a denture

Answer 3

1. pontic - artificial tooth
2. abutment tooth
3. minor connector
4. saddles
5. retention
6. major connector
7. support

Question 4

process for designing a denture and definition of each

Answer 4

1. saddles
   
   • Kennedy class)
2. support
   
   • Bear occlusally directed load of denture
   • Craddock class - can be saddles in mucosa borne)
3. retention
   
   • resist vertical displacement
4. indirect retention
   
   • resist rotational displacement
   • when have small triangular pattern of retention
   • due to concrete and soft ground metaphor (rocking)
5. reciprocation/bracing
   
   • to neutralise the forces applied to the abutment tooth from retentive components preventing tooth tilting etc.
6. connectors
   
   • minor or major
7. review and simplify

Question 5

what are the different methods of retention?

Answer 5

muscular
- denture shape (saliva suction)

physical forces

 - coverage of mucosa (adhesion) 
 - soft tissue undercuts  (altered path of insertion?)

mechanical
- clasps

Question 6

types of mechanical clasps in denture design and their purpose?

Answer 6

1. I bar clasp (gingivally approaching)
   
   • if cant get undercut for long enough clasp (generally pre molars and anteriors)
2. self reciprocating clasp
3. single arm clasp with reciprocating arm

Question 7

what is an RPI system in denture design and when is it used

Answer 7

• made of 3 components
  i. i bar clasp
  ii. reciprocating arm
  iii. proximal plate
• plate agains t distal surface of abutment tooth to prevent rocking of free ended saddles
• REST ON MESIAL SIDE OF ABUTMENT TOOTH

Question 8

what are alternative treatments to denture design

Answer 8

• no treatment
• implant
• fixed prosthesis

Question 9

what are the two saddle types for denture design

Answer 9

i. open design
- no gingival coverage, free flowing saliva and reduced irritation

ii. closed design
- more contact for greater retention

Question 10

complete the sentence:

where there is a ______ there must always be a ______

Answer 10

clasp

support