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Removable Pros > Anatomy of Impression and Posterior Palatal Seal > Flashcards

Anatomy of Impression and Posterior Palatal Seal Flashcards

1
Q

Support of maxillary denture

A

Palate
zygomatic shelf
crest of ridge line

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2
Q

Support for mandibular denture

note major ones

A

Buccal shelf
retromolar pads
crest of ridge lines

more support in buccal shelf and RMP
because more bone support

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3
Q

border seal/ atmospheric pressure

A

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

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4
Q

general vertical height and width of border

A

vertical height – all the way to the depth of the border

width = full width of the border

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5
Q

horizontal component of impression limited by?

A

anatomical limitations

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6
Q

list of muscles (general) that are involved with creating a denture

A

Masseter - muscle of mastication

orbicularis oris and buccinator – muscles of facial expression

mylohyoid and genioglossus – muscles of the floor of the mouth

superior constrictor, tensor veli palatini, levator palatini - muscles of oropharynx

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7
Q

obicularis oris captures what border? how to produce?

A

anterior border of both maxillary and mandibular – ask patient to pretend sucking on straw, puckering lips, whisteling, smiling

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8
Q

buccinator captures what border? how to produce?

A

lateral aspects of the border on maxilla and mandible

can produce by asking patient to pretend sucking on straw, puckering lips, whisteling, smiling

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9
Q

muscles on the floor of the mouth contributing to border molding on mandible
what part of border
how produce

A

Mylohyoid
Genioglossus
on the inner aspect (ligual side of the mandibular border - closer to the tongue)

produce during function of movements of the tongue and swallowing
- stick tongue out and move tongue side to side / to the roof of mouth
if create lingual border too long - cannot move tongue as would

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10
Q

muscles of oropharynx contributing to border

A

superior constrictor
tensor veli palatini
levator paltini

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11
Q 
borders of the retromylohyoid space 
lateral-
medial-
posteriorly
anteriorly-
A

Lateral - retromolar pad
Medial - tongue
Posterior - superior constrictor
Anterior - mylohyoid

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12
Q

what compromises the mandibular sling?

A

Masseter and medial pterygoid

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13
Q

Masseteric notch and how to replicate this during function

A

masseter on buccinator
when patient says OO-EE
open wide and move side to side as well
creating the reverse S shape

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14
Q

shape and characteristics of the Masseteric Notch

A

this is NOT an anatomical position but occurs when the massater slides on the buccinator – interaction of these two muscles
results in a CONCAVITY
this is a FUNCTIONAL FEATURE

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15
Q

what happens if you do not capture the Masseteric notch?

A

denture will POP FORWARD during these sounds

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16
Q

purpose of edentulous impression

A

provide support of denture and retention

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17
Q

if dont border mold the retromylohyoid space well? too long?

A

Difficulty in swallowing and the patient may present with a sore throat

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18
Q

reverse S curve in posterior aspect of mandibular border?

A

by the massateric notch

creates a reverse S and if not accounted for could catch on the corners of the cheeks

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19
Q

frenal attachments

A

lip out and down – want to see these cut through the border molding and PVS allows this

dont want a straight border mold

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20
Q

coronoid process trims a border on where?

A

Maxillary aspect
DISTO-BUCCAL
open wide and then close half way and move side to side

want this to be about 3mm wide in the posterior and uniform all the wall around

if not – too thick they will get stuck or denture will pop out

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21
Q

hamular notches AKA

A

pterygo-maxillary notches

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22
Q

hamular notch importance

locate how?

A

POSTERIOR LIMIT OF THE DENTURE

- will take a t-ball burnisher and rub along area until drops into the notch

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23
Q

two muscles of oropharynx in addition to superior constrictor that encompass the posterior palatal border

A

tensor veli palatini

levator veli palatini

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24
Q

anterior vibrating line

A

unction between moveable and non-moveable tissue on the soft palate
need to locate this because cannot fabricate denture onto moveable tissue

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25
Q

how to determine moveable vs. non-moveable tissue

A

“aah, aa, aah..

but not continuous like day ah ah ah not ahhhhh

26
Q

are the fovea palatini reliable in locating posterior border of the maxillary denture?

A

NO – just area of complex nerve endings and cannot see in all patients

27
Q

focea palatinae

A

anatomical element in the posterior border
two small depressions in the posterior aspect of the palate, one on each side of the midline, at or near the attachment of the soft palate to the hard palate

28
Q

pterygomaxillary raphe

A

patient open wides
fibrotic band
if dont capture - denture will come out

29
Q

primary stress bearing areas on maxilla

A

palate

zygomatic shelf

30
Q

primary stress bearing areas on mandible

A

buccal shelf
- laterally = external oblique ridge
medially = alveolar ridge

31
Q

border molding

A

border molding customizes your impression tray to the desired anatomy, thus enables the clinician to take the impression material all teh way to the borders of the denture

32
Q

implications of denture adhesive

A

note that the patient had to wear this with last denture

want to take final impressions when all tissue is healed- maybe tell them to not wear denture for at least 24 hours before taking final impression

33
Q

do trays move in function

A

NO -

34
Q

border molding material

A

mucodynamic
impression compound
PVS heavy body

35
Q

cut back treys?

A

yes 3mm for the purpose of border molding - we orginally made the treys into the full depth of the folds
*not done in our SLC sessions but will be done clinically

36
Q

anything horizontal?

A

in the moving state– and need to cut these back

37
Q

border molding maxilla actions to capture

A

Anterior- obicularis oris
Lateral - buccinator
Disto-buccal - by cornoid process of mandible

Roll lip over 
pull lip downward
smile big 
pucker your lips
suck on a straw

open wide then close half way move side to side to get the disto-buccal fold on maxillary from the coronoid process from the mandible

38
Q

border molding posterior palatal seal

A

note if there is a Pterygomandibular raphe - capture this

then place material across the back and adapt it in a butterfly shape - getting the levator veli palatini and tensor veli palatini

39
Q

upon removal of maxillary need to have?

A

SIGNIFICANT retention due to atmospheric pressure .. if not something is wrong

40
Q

final mucostatic impression captures what 4 border muscles

A
  1. obicularis oris
  2. buccinator
  3. tensor veli
  4. levator palatini

also gets cornoid proccess for D-B fold and Pterygomandibular raphe in posterior if present

41
Q

Hamular notch line

A

an arbitrary line connecting R and L hamular notches

42
Q

AVL - anterior vibrating line

A

demarcates the movable from non movable tissues in the soft palate and also represents the posterior limit of the denture

43
Q

Compressive Tissue Line

A

junction of compressible and non-compressible tissue

44
Q

PPS/ posterior palatal seal

A

aka post dam
a bead located posteriorly on the INTERNAL SURFACE OF THE UPPER DENTURE - which completes the border seal
-this is inside denture

45
Q

compressible tissue is what shape/ size and how to locate

A

always triangular shaped and can locate this type of tissue with the t-ball burnisher - need to note how deep you are compressing the tissue

4-6mm at its deepest/highest point

HALFWAY B/W midline suture and the hamular notch - if do more too much and wont sit

trying to create a V for a suction

46
Q

how much do you scrape (+where) for depth of tissue displacement?

A

along the anterior vibrating line
scrape HALF the depth of tissue displacement

but should be customized for each patient based on the amount of displacebale tissue

47
Q

where is the Compressive tissue line deepest?

A

along the anterior vibrating line

48
Q

where is the Compressive tissue line most shallow?

A

0mm at the compressive tissue line

at the peak of it

49
Q

purpose of PPS

A
  1. maintains the border seal by displacing the posterior border
    2, prevents food from getting underneath the denture
  2. diminshes/ eliminates gagging
  3. provides sunken distal borders which are less conspicuous to the tongue
  4. compensates for volumetric shrinkage of the acrylic resin
50
Q

place a perpindicular line where?

A

along the midline suture

51
Q

PPS extends where?

A

PAST hamular notches and blended into the DB fold

52
Q

posterior nasal spine

A

should be exactly midline/center in the posterior of the PPS

very shallow

53
Q

T/F border molding mandibular of Masseteric notch can also be achieved by trying to resist while patient tries to close

A

Yes

54
Q

two S curves on mandibular

A

Massateric notch

and on lingual side to capture lingual muscles

55
Q

Border molding and shape of lingual of mandible +

how to produce?

A

Superior constrictor
mylohyoid
Genioglossus
S shaped

tongue forward/out/up
move tongue to left and right
lick upper lip
swallow

56
Q

6 muscles in border mold of mandible

A 
Obicularis oris - anterior
buccinator - lateral
mylohyoid
genioglossus
superior constrictor
masseter on buccinator - notch
57
Q

T/F cut record base back to AVL?

A

TRUE

58
Q

after locating AVL line what do?

A

this is the perpindicular line and after located - scribe with pencil then insert record base and transfer this onto it

59
Q

after transferring AVL line?

A

Cut record base back to AVL and palpate outline of compressible tissue and pencil this in
- then insert record base and trasnfer these lines

60
Q

when can you create the PPS?

A

developed functionally at the impression stage or mechanically at the cast stage

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