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FINALS > Prosthodontics > Flashcards

Prosthodontics Flashcards

1
Q

what is kennedy class I

A

bilateral free ended saddles posteriorly

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2
Q

what is kennedy class II

A

unilateral free ended saddle

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3
Q

what is kennedy class III

A

bounded saddle

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4
Q

what is kennedy class IV

A

anterior bounded saddle that crosses the midline

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5
Q

give four medical conditions that could make denture wearing harder

A

rheumatoid arthritis
xerostomia
osteoporosis/ bisphosphonates
neuromuscular problems

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6
Q

what should the nasio-labial angle be

A

90 degrees

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7
Q

name 4 tests you may want to carry out on a proposed abutment tooth

A

radiograph
EPT
thermal test
6PPC

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8
Q

what is meant by support of the denture

A

resistance to vertical movement of denture towards the tissue

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9
Q

what is meant by retention of the denture

A

resistance to displacement of the denture away from the tissue

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10
Q

what is meant by stability of a denture

A

resistance to horizontal/ lateral movement of the denture

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11
Q

what clinical mishaps can cause the registration to be inaccurate

A

not enough wax removed from saddle areas on the record block
too much interocclusal registration medium

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12
Q

what value is the fixed condylar articulator (average value) set at

A

30 degrees

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13
Q

what type of articulator would you be using if you have taken a facebow registration

A

semi-adjustable
either ARCON or non-ARCON

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14
Q

in what position are casts mounted

A

ICP

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15
Q

how is load transmitted when a denture is tooth supported

A

via the periodontal membrane

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16
Q

why is it inadvisable to place a denture base within 3mm of gingival margin

A

will place pressure at gingival margin

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17
Q

what do rests provide the denture

A

provide support from vertical opposing forces

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18
Q

what do clasps provide the denture

A

retention

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19
Q

name a procedure that can be done to the abutment teeth to increase direct retention

A

to add guide planes - parallel surfaces proximal to saddle area

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20
Q

what is indirect retention in a denture

A

resistance to rotational displacement of a denture

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21
Q

what is the RPI system

A

mesial rest
proximal guide plate
gingivally approaching I bar clasp

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22
Q

what can commonly be used to keep record blocks together

A

registration paste

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22
Q

what tool could you use to record the OVD

A

Willis Bite Gauge

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22
Q

how should an upper record block be adjusted so the occlusal plane is appropriately orientated

A

in line with remaining upper natural teeth
use ala-tragus line if edentulous upper

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23
Q

what is the ala-tragus line

A

from ala of the nose to tragus of the ear

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24
Q

how should the upper record block midline be decided

A

should be coincident with the facial midline

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25
Q

how should the incisal plane of an upper record block be recorded

A

by using the inter pupuillary line

26
Q

what is the Fox’s occlusal guide plane a good tool to use for

A

to recreate occlusal and incisal planes on a record block when there are extended edentulous spaces

27
Q

what 4 things should be checked on a record block where anterior teeth are missing

A

index teeth in occlusion
centre line
canine position
high smile line

28
Q

name two materials that artificial teeth can be made out of

A

acrylic
porcelain

29
Q

name three advantages of plastic acrylic teeth

A

natural appearance
silent during function
chemical bond with denture base

30
Q

name three advantages of modified acrylic teeth

A

chemical bond with denture base
mechanical bond recommended too
higher abrasion resistance

31
Q

name three advantages of porcelain teeth

A

silane coupling agent used to attach to denture base
natural appearance
hard - high resistance to abrasion

32
Q

what are six things you should check after inserting a denture at delivery

A

fit
retention
stability
aesthetics
speech
occlusal contacts

33
Q

how many times daily should denture cleanser be used

A

once daily

33
Q

what are three things you should tell your denture patient on how to care for their dentures

A

clean dentures over filled sink
brush dentures with toothbrush and non-abrasive denture cream
only use denture cleansers outside the mouth

34
Q

why should denture cleansing solutions containing sodium hypochlorite not be used for more than 10 minutes

A

could damage the denture

35
Q

what should you avoid in a denture with a metal base

A

sodium hypochlorite cleaning solutions

36
Q

name five effects if edentulism

A

loss of masticatory function
appearance
self esteem
quality of life
speech

37
Q

what is post extraction absorption and when does it occur

A

occurs rapidly after extraction - in first 6 months

38
Q

what are the 6 classes of atrophy in the mandible (Cawood and Howell)

A

stage 1 - pre-extraction
stage 2 - immediately after extraction
stage 3 - high-well rounded ridge
stage 4 - knife-edged shaped ridge
stage 5 - low well-rounded ridge
stage 6 - depressed bone level

39
Q

name four reasons for rendering a patient edentulous

A

caries
periodontal disease
tooth wear
head and neck cancer pre-treatment

40
Q

what are the three different methods of complete denture construction

A

conventional
replica
digital dentures

41
Q

what is included in a denture history

A

age of current dentures
are they a matched set
most recent set worn
how many sets of dentures has the patient had

42
Q

what two soft tissue diseases are often seen in denture wearers

A

angular cheilitis
denture stomatitis

43
Q

what are the areas of support in the upper jaw

A

hard palate (primary)
ridge crest (secondary)

44
Q

what are the areas of support in the lower jaw

A

buccal shelf and pear-shaped pad (primary)
ridge crest and genial tubercles (secondary)

45
Q

what is the ideal value for free-way space

A

2-4mm

46
Q

what are the seven steps to record occlusion in complete dentures

A

1 - adjust upper block for retention
2 - adjust upper block for tooth position
3 - adjust upper block for occlusal planes
4 - lower tooth position and horizontal jaw relationship
5 - measure vertical dimension
6 - record registration
7 - shade selection and mould

47
Q

what is LIMBO

A

lip support
incisal edge
midline
buccal corridor
occlusal plane

48
Q

what is the recommended nasio-labial angle

A

90 degrees

49
Q

what can be used to check tooth position

A

alma gauge

50
Q

how much incisal level should show at rest

A

1-2 mm

51
Q

what occurs in a patient with excessive freeway space

A

overclosed facial appearance
cheek biting and TMJ problems

52
Q

what occurs in patients with inadequate free way space

A

excessive load on denture bearing area
continuous muscular activity = pain

53
Q

name 4 displacing forces of dentures

A

gravity
muscle activity
sticky foods
function

54
Q

name factors that can affect the retention and stability of dentures

A

atrophic ridges
incomplete palates
mobile soft tissue (fibrous/ flabby ridge)
gagging patients

55
Q

what do the three numbers on tooth mould selections reveal for anterior artificial teeth

A

top - width of 6 anterior teeth laid out flat
middle - width of left central incisor
bottom - length of left central incisor

56
Q

what do the two numbers reveal on mould selection for posterior artificial teeth

A

top - width of 4 posterior teeth laid flat
bottom - depth of crown of left first molar
U = maxillary L = mandibular

57
Q

how far anterior to the incisive papilla should anterior teeth be set

A

5.5mm

58
Q

what is the occlusal plane parallel to

A

ala-tragus line

59
Q

when should cuspless artificial posterior teeth be used

A

when it is difficult to get a reproducible jaw relationship

60
Q

what is aspiration pneumonia and why is it associated with dentures

A

dentures are a reservoir for potential respiratory pathogens
increases risk of inhaling these pathogens

61
Q

how should metal based dentures be cleaned

A

effervescent alkaline peroxide cleaners - steradent for 15 mins max

62
Q

name some contraindications of immediate dentures

A

ORN/ MRONJ cases
pre-chemo or radiotherapy
dementia

FINALS (25 decks)

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