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Removable Pros > Impressions & Impression Materials For Complete and Partial Dentures plus Occlusal Rim Lab Video > Flashcards

Impressions & Impression Materials For Complete and Partial Dentures plus Occlusal Rim Lab Video Flashcards

1
Q

which property is more important for preliminary impressions?

A

ADHESION -Increases surface area, increase adhesion

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2
Q

adhesion

A

attraction of DIFFERENT molecules to each other.

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3
Q

how do you increase adhesion?

A

by increasing surface area

increase surface area = increase adhesion

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4
Q

cohesion

A

attraction of the IDENTICAL molecules to each other.

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5
Q

how do you increase cohesion?

A

increase by increasing the CONTACT (closeness)

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6
Q

atmospheric pressure

A

the pressure exerted on the denture by the air around it VS the LACK of air inside the denture

pressure differential between the inside and the outside of the denture

the amount of SUCTION present as formed by the POSTERIOR PALATAL SEAL (POST DAM) and the peripheral borders

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7
Q

physical properties of Denture Retention

A

adhesion, cohesion, atmospheric pressure

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8
Q

what is the best preliminary impression material for a patient who gags easily? why?

A

impression compound - due to its flow properties and its quick set time

  • compound has a 10-15 second set time and can be removed before it is completely set
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9
Q

why is it important to use a mucostatic impression material to record soft tissues accurately and passively?

A
  1. helps limit movement

2. reduced denture caused bone loss

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10
Q

saliva - mucosa attraction?

A

adhesion

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11
Q

saliva-denture attraction?

A

adhesion

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12
Q

saliva-saliva attraction

A

cohesion

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13
Q

clinical significance of atmospheric pressure border seal

A

the contact of the denture border with the underlying or adjacent tissues to prevent the passage of air or other substances

  • by using muco-dynamic border molding material
  • creates the suction you need
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14
Q

great complete denture impressions are…

A
  1. muco-dynamic –> at the borders to create SUCTION
  2. muco-static–> everywhere else to LIMIT RESOPRTION AND INCREASE COHESION
  3. Covers as much surface area as possible to reduce movement and limite resorption and increase adhesion
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15
Q

muco-static will…

A

limit resorption and increase cohesion

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16
Q

muco-dynamic will…

definition?

A

create suction at the borders
selective displacing certain musculature and tissues of the oral cavity during an impression to force air out, changing the atmospheric pressure and creating suction

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17
Q

covering as much surface area as possible will…

A

reduce movement and limit resorption and increase adhesion

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18
Q

which impression material is too dynamic to accurately record soft tissues in edentulous impressions?

A

Alginate

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19
Q

what property (properties) does saliva contribute to and for denture retention?

A
  1. irrigation and lubrication of the mucous membrane

2. saliva enhances cohesion with enhances retention

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20
Q

retention is a function of?

A
  1. patient adaption
  2. polished surface contour
  3. atmospheric pressure
  4. adhesion
  5. cohesion
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21
Q

imbibition definition

A

a property of IRREVERSIBLE hydrocolloid (allginate) that refers to its tendency to absorb moisture from its surroundings and EXPAND

22
Q

synersis definition

A

is the expulsion of a liquid from a gel - causing the alginate to dessicate - dry out

23
Q

wraping alginate impressions prior to pouring?

A

paper towel - and it must be well rung out and damp -only

24
Q

recommended impression material for a patient who has large embrasures / excessive undercuts?

A

Polysulfide Rubber – PSR

PVS has a much higher tear energy than PSR

25
Q

adhesion and cohesion in denture

A

adhesion - >denture - Mucosa

Cohesion –> Denture - Saliva —Saliva - Mucosa

26
Q

is the green stick compound used to make corrections to the preliminary impression (red cake compund) higher, lower, or same fusing temperature?

A

lower

27
Q

what is the relationship between the mandibular wax rim to the anterior and posterior ridge crest lines?

A

CENTERED - the entire mandibular wax rim is centered to the mandibular ridge crest

28
Q

facial surfaces of the maxillary central incisors are located?

A

6mm forward (in front of) the incisve papilla

29
Q

when ask a patient to open their mandible wide and then close halfway and slide their mandible from side to side, what is the location of the denture being trimmed?

A

disto-buccal flange upper denture

the coronoid process of the mandible trimes for the width of the DB flange of the maxillary impression/denture border

30
Q

what do you do in the DB area?

A

extend the post dam by continuing and tapering the scoring into the DB folds bilaterally to ensure a complete seal of the borders

31
Q

where do you terminate the maxillary rim?

A

from tuberosity to tuberosity - on the anterior aspect of it

32
Q

measurement on the occlusal surface anteriorly and posteriorly

A

anterior - 22mm measured from labial frenum to occlusal plan

posterior - parallel to the base of the casr

33
Q

width of occlusal rim for maxillary

A

8mm - posterior in molar are
6mm wide in premolar area
4 mm wide in incisor area

34
Q

width of maxillary rim is tapered how?

A

occlusally and incisally from the lingual aspext to better approximate the width of the teeth

35
Q

posterior extension of the mandibular occlussal rim?

A

Just anterior to the retromolar pad

36
Q

height of the mandibular occlusal rim?

anterior and posterior

A

Anterior= 18 mm high - from labial frenum to occlusal plane

posterior = 2/3 height of retromolar pad

37
Q

what part of the mandible trims the width of the border of this denture impression being made?

A

coronoid process

38
Q

what will tear easier, alginate or PVS?

A

alginate will tear easier than PVS

39
Q

what material is most commonly used with a custom tray to form a mucodynamic impression of the folds and posterior palatal seal?

A

IMPRESSION COMPOUND (green stick)

alternative accepted answers: heavy bodied-PE, PVS. Silicone Putty

40
Q

what material is too dynamic to accurately record soft tissue in endentulous impressions?

A

alginate

41
Q

purpose of secondary cast

A

retention

42
Q

space at palate is referred to as what?

A

space of dondore

43
Q

where do we use muco-dynamic material?

A

BORDER MOLDING MATERIAL
at the borders - to create suction
compound or heavy bodied material

44
Q

wash impression material

A 
aka final coat?
MUCO-STATIC 
thin coat of very light bodied impression material to get increasing detail 
- barely compresses the tissues 
- supported by the border molding
45
Q

surface area covering in maxillary and mandible

A

maxillary - incisal papilla to hamular notches

mandible - all the way up retromolar pads

46
Q

rigid materials and are they good for use with teeth?

A

Impression compound
ZOE Paste
Plaster of Paris

Not good for teeth and not good for undercuts

47
Q

elastomeric materials

A

hydrocolloids
Polysulfide (rubber-base)
Silicones (PVS)
Polyether

Can work on teeth and good for undercuts

48
Q

final impression material

A

PVS

49
Q

time alginate should be poured up in?

A

8 minutes and decast in 20 minutes

50
Q

impression material used for preliminary impression of edentulous arches?

A

compound

51
Q

Zoe material?

A

Great static impression

- but hard when sets and pt intolerance

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