Components of removable partial dentures

Question 1

Answer 1

Question 2

What defines the functional depth of the sulcus?

Answer 2

Determined by the anatomy and movement

Question 3

What determines the width of the sulcus?

Answer 3

Created by the actions of the muscles and frenulum in the impression material

Question 4

What is support?

Answer 4

resistance to vertical forces directed towards mucosa

Question 5

What can support a denture?

Answer 5

teeth: tooth borne
mucosa: mucosa borne
tooth and mucosa: tooth and mucosa borne

Question 6

What are examples of mucosa borne dentures?

Answer 6

every denture

spoon denture

transitional dentures (gum strippers)

Question 7

Does an evry denture (mucosa birne) have flanges?

Answer 7

yes

Question 8

How is support achieved in mucose borne dentures?

Answer 8

sanddles

connectors

Question 9

Where does support come from in tooth borne dentures?

Answer 9

rests

also: connectors, overdenture abutments and occlusal onlays

Question 10

Answer 10

A = bounded saddle
B = free-end saddle (tooth at one end)

Question 11

What is a saddle?

Answer 11

is an edentulous region of the alveolar ridge

Question 12

What type of denture relies on saddles?

Answer 12

mucosa dentures

Question 13

What is the kennedy classification?

Answer 13

classifies the jaws based on the the of saddles that are going to be replaced

Question 14

When are the missing 2nd or 3rd molars not included in the kennedy classification?

Answer 14

if they are not included in the design of the denture

Question 15

describe this kennedy classification

Answer 15

kennedy 2 classification

1 free-end saddle

Question 16

describe this kennedy classification

Answer 16

kennedy 1 classification

2 free-end saddles

Question 17

Describe this kennedy classification

Answer 17

kennedy 3 classification

bounded saddle

Question 18

describe this kennedy classification

Answer 18

kennedy 4 classification

bounded sanddle ant. teeth

Question 19

what are apelgate modifications?

Answer 19

additions to the kennedy classification

Question 20

What does apelgate modification refer to?

Answer 20

spaces (not teeth)

Question 21

Definition of connectors?

Answer 21

rigid components of a denture which hold all other components together

they provide cross-arch stability to help resist displacement by functional stresses

Question 22

what are the major and minor connectors shown?

Answer 22

pink = minor

black = major

Question 23

What are types of maxillary major connectors? (4 types)

Answer 23

palata; bar

horseshow (anterior) - usually for kennedy 4 whch are short saddles

anterior-posterior bar

plate

Question 24

what is the problem with cobalt chrome dentures?

Answer 24

hard to add on teeth

acrylic much easier

Question 25

How can the plate denture cause periodontal pocket?

Answer 25

connector contact with the gingival margin and cause inflammation and pocket

Question 26

What are types of connectors for mandibular dentition?

Answer 26

sublingual bar

lingual bar

dental bar

kennedy bar continuous clasp

lingual plate

buccal bar

Question 27

what is the most commonly prescribed mandibular bar?

Answer 27

lingual bar

Question 28

Describe a lingual bar

Answer 28

placed in sulcus at highest possible position

needs to be 3-4 mm below gingival margin

connector needs to be 4 mm

need 7-8 mm space below

Question 29

what is a dental bar?

Answer 29

if you don’t have enough space for a sublingual or lingual bar

placed on the middle third of the lingual surfaces of lower anterior teeth

teeth must be 8 mm in height

Question 30

What is a kennedy bar/continuous clasp?

Answer 30

dental bar combined with a dental bar

can reduce material and not compromise the longevity of the connector

Question 31

What is a lingual plate?

Answer 31

last option

made of acrylic or cobalt chrome

extends from lingual sulcus to suprasingular surfaces of teeth

pt need good oral hygiene as it covers the gingival margin

Question 32

What is a buccal bar?

Answer 32

last resort!

used when teeth are retroclined

cause trauma to buccal tissue

need clear gingival margins by 3mm

Question 33

What support does a rest provide?

Answer 33

vertical support

Question 34

What is the role of a rest?

Answer 34

maintains components in their planned position

maintains establishing occlusal relationship by preventing setting of the denture

prevents impingement of soft tissue

directs and distributes occlusal loads to abutments teeth

Question 35

What are 3 types of rests?

Answer 35

Question 36

How wide should the base of the rest be?

Answer 36

2.5 mm up to a third across the occlusal surface

Question 37

Do you need to carve the tooth to place a rest? (rest seats)

Answer 37

yes, around 1.5mm lower the marginal ridge to provide a rest for the rest and minor connector

the prep should dip to allow the cusp to spread pressure apically