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Complete Dentures > Impressions and Occlusion for Complete Dentures > Flashcards

Impressions and Occlusion for Complete Dentures Flashcards

1
Q

what is the first clinical stage

A

impressions - make special trays

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2
Q

how big is a spacer normally

A

3mm

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3
Q

what is the second clinical stage

A

master impressions - master casts and record blocks

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4
Q

what is the third clinical stage

A

jaw reg
choose shade, mould and setting
mount casts and set up

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5
Q

what is the fourth clinical stage

A

try in - retry or finish

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6
Q

what are the try in checks

A

vertical dimension of occlusion
even contact in RCP
lip support
occlusal planes - anterior/posterior
lower teeth over ridge
speech
retention and stability
base extensions
appearance

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7
Q

what is the fifth clinical stage

A

insertion (finish)

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8
Q

what is the insertion checks

A

vertical dimension of occlusion
even contact in RCP
speech
retention and stability
base extensions
appearance
comfort

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9
Q

what is the sixth clinical stage

A

review

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10
Q

what are the review checks

A

pain/redness/ulceration
function
aesthetics
speech
recheck occlusion/vertical dimension

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11
Q

how do you know if an impression tray is too small

A

flanges hit the ridge

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12
Q

how do you know if an impression tray is too large

A

stretches the mouth or feels uncomfortable or cannot get it in the mouth

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13
Q

what are the limitations of stock trays

A

rarely fit mouth accurately
often require modification
difficult to obtain necessary border seal

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14
Q

how do you evaluate the impression

A

general adaptation and surface detail
appropriate sulcus depth and shape
ensure ridge is in centre of tray
appropriate landmarks included
anterior lingual sulcus
impression fixed to tray

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15
Q

what are special trays made in

A

light cure acrylic resin

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16
Q

what are advantages of special trays

A

need less impression material
custom made
ensures even thickness of impression material
less bulky

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17
Q

what are tissue stops used for

A

ensure uniform thickness of impression material
help localise tray during impression taking

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18
Q

where do you place tissue stops in upper and lower trays

A

upper - place in canine region and along post dam area
lower - place in canine region and over retromolar pads

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19
Q

what is used to make tissue stops

A

greenstick or incorporated into tray in acrylic

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20
Q

when are finger rests used

A

in lower special trays

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21
Q

where are finger rests placed

A

in region of 2nd premolar/1st molar

22
Q

what do finger rests allow

A

fore finger to be placed on either side of tray, thumb under mandible for support to ensure it is fully seated posteriorly and ensure more even distribution of pressure to the tissues
helps stabilise tray in mouth

23
Q

what is mucocompression

A

pressure is applied to the mucosa so that the shape of tissues under load is recorded

24
Q

what is mucostasis

A

minimum pressure is applied to the tissues to record their shape at rest

25
Q

what technique do you do avoid compression of flabby ridge

A

use impression with perforated tray with both high and low viscosity material

26
Q

what are the 3 types of record block

A

wax block only
shellac base
heat cured base

27
Q

what is the equipment used for jaw reg

A

no air/hot plate/bunsen
wax knife/palate knife
foxes bite plane
willis bite gauge/callipers
tooth shade and mould guide
bite registration paste

28
Q

what does LIMBO stand for

A

lip support
incisal level
midline
buccal corridor
occlusal plane

29
Q

when do you use LIMBO

A

when adjusting the upper record block for tooth position

30
Q

what is the recommended nasiolabial angle

A

90 degrees

31
Q

what do you use to check tooth position

A

alma gauge

32
Q

what do you use to check incisal level

A

visual judgement
photographs of natural teeth
lip level
lip during speech
age
1-2mm of show

33
Q

what should you get the patient to do when checking incisal level

A

fricatives

34
Q

what lines are marked onto the record block

A

lip line, canine line, midline line

35
Q

what is the buccal corridor

A

space between teeth and buccal mucosa shown when smiling

36
Q

what references do you look for when looking at the occlusal plane

A

interpupillary
ala-tragus

37
Q

what is the neutral zone

A

space between lips and cheeks on one side and tongue on other

38
Q

where should the teeth be in the neutral zone

A

anterior teeth = over ridge
posterior teeth = over ridge

39
Q

what happens if the teeth and buccal flange are too close to the cheek

A

dislodges denture with cheek movement

40
Q

what happens if the teeth are too lingually placed

A

poor tongue space and tongue lifts denture when it moves

41
Q

what happens if the lingual flange is an incorrect shape

A

tongue lifts denture when it moves

42
Q

what is retruded contact position

A

guided occlusal relationship occurring at the most retruded position of the condyles in the joint cavities

43
Q

what is muscular position

A

position of closure produced by balanced muscle activity raising the mandible from rest to initial contact

44
Q

what is occlusal vertical dimension

A

distance between a set point on the maxilla and a set point on the mandible when the teeth are in maximum intercuspation

45
Q

what is the resting vertical dimension

A

when the mandible is at rest with patient upright

46
Q

what can affect the RVD measurement

A

stress
pain
anxiety
tensing of facial muscles

47
Q

what should the ideal freeway space be

A

2-4mm

48
Q

what would be the effects of excessive FWS

A

reduced masticatory efficiency
overclosed facial appearance and cheek biting
TMJ symptoms

49
Q

what would the effects of reduced FWS be

A

excessive load on denture bearing area
continuous muscular activity results in pain
aesthetic complaints
noisy dentures

50
Q

how do you measure vertical dimension

A

willis bite gauge

51
Q

what are the final checks before recording registration

A

are blocks trimmed se teeth will be in neutral zone
even contact with upper block?
OVD correct for patient with adequate FWS
centre line correct
occlusal planes appropriate

Complete Dentures (11 decks)

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