SDEO Partial denture design

Question 1

retention?

Answer 1

describes the resistance of a denture to lifting away from the tissues - vertical dislodging forces

resistance to vertical displacement

Question 2

support?

Answer 2

describes the resistance of a denture to occlusally directed load

Question 3

Craddock classification?

Answer 3

class 1 - tooth borne

class II - mucosa borne

class III - combination of mucosa and tooth e.g. in free end saddle

Question 4

Reciprocation?

Answer 4

resists horizontal load

Question 5

indirect retention?

Answer 5

resistance to rotational displacement

Question 6

Types of direct retention?

Answer 6

mechanical

frictional

muscular

physical

Question 7

frictional direct rtention?

Answer 7

parallel guide planes to retain denture base

prevent denture from dislodging

Question 8

muscular direct rtewntion?

Answer 8

forces of the muscles keeping the denture in place

Question 9

physical direct retention?

Answer 9

forces of adhesion and cohesion to the denture bearing surface

Question 10

mechanical direct retention?

Answer 10

engaging hard of soft tissue undercuts e.g. claps

Question 11

2 categpre sof claps?

Answer 11

gingivally or occlusally approaching

Question 12

minimum length of an occlusally/suprabulge clasp

Answer 12

15mm

Question 13

retentive arm f a clap - definition?

Answer 13

a flexible arm which deflects over bulbosity to engage the undercut of the tooth

only terminal 1/3 of clasp will be below survey line to engage undercut

Question 14

Flexibility of the retentive arm depends upon what?

Answer 14

material

length

thickness

Question 15

undercut for corc?

Answer 15

0.25mm

Question 16

undercut for gold?

Answer 16

0.5mm

Question 17

undercut for stainless steel?

Answer 17

0.75mm

Question 18

Pattern of retention?

Answer 18

number and location of clasps

Question 19

Minimum number of retainers?

Answer 19

2 - 1 either side of dental arch