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Removable Pros > L2-Impression and Impression Materials + Trays and Retention > Flashcards

L2-Impression and Impression Materials + Trays and Retention Flashcards

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1
Q

Goal of impression

depends on…

A
  1. type of impression depends on..
  2. purpose of impression depends on…
  3. type of prostheis
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2
Q

what will tear easier… alginate or PVS?

A

alginate

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3
Q

Primary cast - purpose?

A

Support and Surface Area
DIAGNOSTIC
capture the SA and see what support we can get

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4
Q

T/F you can fabricate a denture on a primary cast

A

FALSE

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5
Q

Secondary cast - purpose?

A

RETENTION
can see more defined rugae and more accuracy here

make sure to have right type of trey and material

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6
Q

RETENTION is a function of what? (five)

A
  1. patient adaption
  2. polished surface contour
  3. atmospheric pressure
  4. adhesion
  5. cohesion
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7
Q

adhesion and how to increase it

A

attraction of DIFFERENT molecules to each other - and increases by increasing SURFACE AREA

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8
Q

cohesion and how to increase it

A

attraction of the IDENTICAL molecules to each other - increase by increasing CONTACT (closeness)

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9
Q

atmospheric pressure

A

the pressure exerted on the denture by the air around it vs the LACK OF AIR inside the denture

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10
Q

is adhesion enough for denture retention?

A

NO - need the addition of cohesion

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11
Q

clinical significance of saliva-mucosa and attraction type?

A

adhesion

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12
Q

saliva-denture attraction is an example of?

A

adhesion

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13
Q

saliva-saliva attraction is an example of?

A

Cohesion attraction

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14
Q

what contributes to the suction formed by posterior palatal seal?

A

atmospheric pressure and by using mucodynamic capture of the folds by the final impression

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15
Q

atmospheric border seal - clinical significance

A

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

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16
Q

wash impression material?

A

VERY light bodied - barely signals on tissue and barely compresses the tissue so we can see detail of rugae and any other detail on the surface

this is a very low viscocity material

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17
Q

Muco-dynamic where? wht?

A

at the borders to create SUCTION

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18
Q

Muco-static where? why?

A

everywhere else

to limit resorption and increase cohesion

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19
Q

why cover as much surface area as possible?

A

to reduce movement and limit resorption and increase adhesion

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20
Q

muco-dynamic definition

A

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

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21
Q

muco-static definition

A

an impression taken without displacing any tissue - the mucosal tissues of the jaws as they are in a state of rest..

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22
Q

how do we (steps) for making impressions for edentulous?

A
  1. preliminary and final
  2. border molding and final impressions
  3. selective impressioning -
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23
Q

impression compound, ZOE paste and plaster are rigid or elastomeric?

A

rigid — NOT GOOD FOR UNDERCUTS

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24
Q

hydrocolloids, Polysulfide (rubber-base), silicones (PVS) and polyether are rigid or elastomeric?

A

elastomeric - GOOD FOR UNDERCUTS

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25
impression compound is reversible or irreversible?
reversible
26
impression compound used when?
for preliminary impressions - also alginate
27
characteristics of compound impressions?
``` mucodynamic more stable than alginate better extension into vestibule folds can be removed before set (gagger) can bead and box inelastic cost-low ```
28
alginate is mucostatic for?
hard tissues
29
alginate is muco-dynamic for?
soft tissue - heavy body
30
can you bead and box alginate?
no- may deform under wight of stone if unsupported
31
trays for preliminary impressions?
Must use edentulous trays if patient is edentulous because dentate stock trays will hold excessive alginate
32
"Best" tray fit mindset?
may not be perfect - so adjust when need to with periphary wax use periphary wax in areas that need more coverage or added material like to cover the RMP area or hamular notches
33
general characteristics of final impressions
they are BOTH mucostatic and mucodynamic (so mucoselective)
34
general final (2) impressions objective
Mucostatic detail (closeness= cohesion) Diagnose denture Mucodynamic (at the borders - and includes PPS)
35
two types of material (general) that are required for final impressions list the examples
Dynamic - at border using compound and PVS - heavy bodied Static (recording the interior tissues) using light body polysulfide (rubber base) PVS - Light and extra-light viscosity ZOE (zinc oxide and eugoenol)
36
Polyvinyl Siloxanes
Excellent surface details ;ight body PVS and XLV static impression material - recording excellent tissue detail w/o compressing tissues
37
characteristics of ZOE
most mucostatic but are very sensative to moisture are inelastic/rigid irreversible but relinable there are patient sensativity issues also contraindicated if patient has exccess saliva or xerostomatic
38
rubber base impressions are mucostatic if?
if they are light bodied
39
tear energy between PVS and Rubber base?
PVS has MUCH HIGHER tear energy
40
when is PVS contraindicated?
when patient has undercuts and large embrasures
41
heavy body where?
borders - mucodynamic
42
medium body where?
interior
43
light or XL where?
intaglio - interior tissues - mucostatic detail
44
impressions increase adhesion by? | cohesion by?
Adhesion by increasing surface area cohesion by increasing closeness
45
primary imperssion obkectives
``` patient diagnosis tissue outline preliminary casr tray fabrication adhesion ```
46
secondary / final impression objectives
1. denture diagnosis 2. tissue detail 3. final cast 4. denture fabrication cohesion
47
a well made custom tray?
1. Fits closely to allow use of static impression materials 2. relieved with wax depending on impression material used 3. can be adapted at the borders to produce a dynamic seal (compound, PVS heavy) 4. results from a great preliminary impression
48
need tissue spacer when using PVS?
yes- PVS needs body in order to capture details without breaking apart
49
custom trey is made from?
preliminary impression
50
what do you use to make final impression (not material)
custom treys
51
potential problomatic areas?
Anterior and Posterior undercuts
52
where should you block out?
in the undercuts - we can increase closeness which will increase cohesion
53
Effect on anterior blockout for anterior of tray
1. maintains tissue contact 2. maintains lip position 3. maintains border seal important the tray goes with path of insertion and maintains contact everywhere
54
what do you do if anterior undercuts exist?
alter the path of insertion | if undercut - will need to position the tray up and back not just in and up
55
what do you do if there are posterior undercts?
1. alter the path | 2. block out EVENLY
56
corrective procedure for undercut in anterior only?
eliminate or decrease with TAIL DOWN TILT
57
corrective procedure for undercut in posterior only?
eliminate or decrease with NOSE DOWN TILT IF NO ANTERIOR UNDERCUTS--anterior undercuts could increase with this if they exist OR block out evenly in posterior
58
corrective procedure for undercut in anterior and posterior?
1. eliminate or decrease anterior undercut 1st with TAIL DOWN TILT, then block out posterior undercuts evenly so use the anterior as the new path and block out the posterior undercuts
59
if patient has anterior and posterior undercuts will blocking out anterior work?
it could increase the posterior undercuts by doing tail down tilt (if dont block out posterior) and just change path of insertion
60
adapt denture where and block out where?
adapt in anterior - to avoid too much thickness and blockout in the posterior
61
posterior blockout compromises what?
loss of cohesion but not loss of esthetics
62
tail down tilt
eliminates the anterior undercut
63
nose down tilt
eliminates posterior undercut
64
fabricating trey in SLC vs clinical?
clinical -- all the way then cut 3mm from full depth of fold (with width remaining at 3mm) for clinical patient SLC - went to the full depth and width of fold for SLC dentoform
65
spacer and tissue stops for PVS? for PSR?
PVS - yes | PSR- no

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