Prosthodontics L7 - saddles, connectors and retainers

Question 1

low cost

easily modified

where life expectancy of denture short

if additions likely

where few reamining teeth

the points above describe which type of denture

Answer 1

Acrylic

Question 2

strong rigid in thin section

less bulky

more hygienic if properyly designed

more expensive

difficult to add to

require a very accurate impression

the above points best descrivbe whch dentures

Answer 2

cobalt chromiun based dentures

Question 3

the saddle of the denture has two functions, what are they

Answer 3

the part of the partial denture which carries the artificial teeth and replaces lost tissue

Question 4

bounded saddles have abutment teeth at which side of the sadde

Answer 4

either end of the saddle

Question 5

how many abutment tooths does a free end saddle have

Answer 5

there is a single abutment tooth at the mesial end of the saddle.

Question 6

a tooth which the loss of will convert a bounded saddle into a free end saddle - is know as a what

Answer 6

critical abutment tooth

Question 7

when designing a saddle what is the desired aim for the extensions

Answer 7

spread the load by covering the maximum amount of tissue as possible

Question 8

a part of the partial denture which unites other components - is known as what

Answer 8

a connector

you can get major/minor connectors

Question 9

a major connector unites partial denture saddles with what

Answer 9

a plate or bar

Question 10

what is this

Answer 10

cobalt chromium lingual plate

Question 11

what is this

Answer 11

dental bar

Question 12

what is the desired tooth length to have an dental bar

Answer 12

9mm

Question 13

what is this

what is the miniment requirement for the depth of lingual sulcus

what is the minimum requirement of gingival clearance

Answer 13

lingual bar

7 mm for the depth of the lingual sulcus

3.5 mm of the gingival clearance

Question 14

what type of plate is this and under what conditions would it be used

Answer 14

this is a split lingual plate and would be used on patients who have gaps between their teeth, this plate prevents the metal from being visible

Question 15

what is the name of this denture

Answer 15

swinglock denture

Question 16

conectors that avoid gingival margin coverage are favoured. true or false

Answer 16

true

Question 17

what type of denture is used for someone who has lost their anterior tooth through trauma and require a denture immediatley

Answer 17

spoon dendure is the most common. gingival margins free other than abutment teeth

more secure denture would be a t-denture

Question 18

what design is this and what type of bar is this

Answer 18

horseshoe design

anterior palatal bar

Question 19

what is the name of this bar

Answer 19

mid palatal bar

Question 20

what is the typical width of a mid palatal bar

Answer 20

7 to 12 mm

Question 21

name this type of bar design

Answer 21

posterior palatal bar

Question 22

what would be required (in terms of coverage) when there is a free end and bounded saddle,

Answer 22

more extensive coverage

Question 23

what are sectional maxillary dentures

Answer 23

these are small dentures where they replace anterior teeth, however do not replace posterior teeth.

patients prefer these because they are not bulky

Question 24

the connecting component between the major connector or base of a partial denture and other units such as clasps and rests - what is being described

Answer 24

minor connector

Question 25

where are the minor connectors located on this denture

Answer 25

Question 26

why would you use a striking plate

Answer 26

striking plates are put in when the opposing teeth come in contact with the denture, causing it damage

Question 27

HOW ARE DENTURES RETAINED BY SALIVA

Answer 27

physical forces created by a film of saliva between the denture base and mucous membrane

Question 28

along with Physical forces created by a film of saliva between the denture base and mucous membrane how else are denrures retained

Answer 28

muscle activity of the lips, cheeks and tongue

Question 29

which particular denture is heavily reliant on the retention by saliva and tissue support

Answer 29

partial upper spoon denture

Question 30

what are direct retainers

Answer 30

direct retainers are clasps which engage the undercuts in teeth

Question 31

what is the function of an undercut gauge

Answer 31

to measure the depth of undercut

Question 32

occlusally approaching clasps are a more efficient bracing component, what is meant by brazing

Answer 32

the resistance of lateral movement of the denture

Question 33

what force should a clasp exert when seated

Answer 33

the force must be passive and not exert any force on the tooth

Question 34

the point of action for a clasp is located where

Answer 34

at the tip

Question 35

a ring clasp is commonly used on critical abutment tooths.

how does this claps support the tooth

Answer 35

it supports the tooth by bracing, reciprication and retention

Question 36

a cast cobalt chromium claps is extremely hard, strong and rigid material. it canbe incorporated in a CoCr casting of denture base. how much undercut depth can the clasp engage

Answer 36

0.25mm

Question 37

wrought stainless steel clasp or more flexible than cast CoCr clasp.

how much undercut depth can wrought stainless steel engage

Answer 37

0.5mm

Question 38

gold claps can engage undercut depths of ?

Answer 38

0.75mm

Question 39

when would you use thermoplastic copolymer (dental d) clasps

Answer 39

teeth with deep undercuts

Question 40

what is an RPI system

Answer 40

R = mesial rest

P = distal guiding plate

I = I shaped retentive clap (I bar)

used in a free end saddle situation