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AUDE 5450 AMP 1 > Earmold Impressions > Flashcards

Earmold Impressions Flashcards

1
Q

Careful visualization of this area of the external auditory canal during otoscopy allows audiologists to identify the location of the second bend.

A

anterior canal wall

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2
Q

Ideally, the canal length of an earmold impression will reach this depth to supply all the necessary information on anatomy an earmold manufacturer requires.

A

2mm past second bend

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3
Q

Combines 1:1 polyvinyl-siloxane parts of paste

A

addition cured silicone

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4
Q

Dimethyl-siloxane paste mixed with hardener

A

condensation cured silicone

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5
Q

Dimethyl-siloxane paste mixed with hardener

A

methyl methacrylate

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6
Q

What is the primary reason for using high-viscosity impression material when making earmold impressions?

A

supplies max stretch of aperature

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7
Q

Which 4 case history questions must be asked immediately before every earmold impression is taken (even when you’re working with a well-established patient!)

A

Are you immunocompromised; have you ever had surgery on your ears; do you take blood thinners; do you have any allergies (silicone or lube ingrediants)

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8
Q

Which three case history questions must be asked immediately before every earmold impression is taken (even when you’re working with a well-established patient!)
Are you immunocompromised; have you ever had surgery on your ears; do you take blood thinners

Are you diabetic; do you cough easily; do you bruise easily

Do you use Q-tips; Do you take Heparin; Is the shape of your ear abnormal

A

Are you immunocompromised; have you ever had surgery on your ears; do you take blood thinners

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9
Q

To effectively assess the external auditory canal using diagnostic otoscopy, the audiologist may sit or stand. The viewing position and angle do not make a difference

A

false

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10
Q

Earmold impressions should not be taken when a perforation of PE tube is present

A

false

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11
Q

This type of otoblock allows the audiologist to create a longer impression of the external auditory canal with less patient discomfort.

A

Cotton otoblock that’s equal in size to the EAC entrance

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12
Q

You feel resistance during otoblock insertion suggesting you’ve chosen the correct size. If the resistance suddenly decreases as you move it more deeply in the canal it indicates…

A

the patients ear canal widens beyond the 2nd bend

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13
Q

Open jaw impressions

A

increases size of the aperature

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14
Q

where is the valley

A

behind helix crus

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15
Q

what does the valley become

A

helix lock for retention

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16
Q

why do we fill the valley

A

where helix lock goes
causes stability & retention of the earmold made

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17
Q

what does the crus help with

A

helps us align the tube orientation correctly

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18
Q

what does the concha bowl provide

A

stability and/or retention

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19
Q

keeps earmold from coming out of the ear and provides retention

A

antitragus

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20
Q

what is the isthmus

A

where canal begins to smallen, transition from cartilage to bone (bone is at or past second bend)

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21
Q

does the ear canal space change when we open and close our mouths

A

YES

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22
Q

how can you consider mandible movement

A

have PT open & close jaw while doing otoscopy

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23
Q

does the Length differ for superior and inferior measurements of the canal

A

YES
b/c TM is oblique

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24
Q

avg canal length in adults

A

25mm

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25
Q

Transition from cartilaginous to bony canal

A

isthmus

26
Q

Distance from canal entrance to isthmus is

A

aprox. 10mm

27
Q

acoustic seal area

A

aperture

28
Q

why do we want a stretched aperature? what happens if we don’t

A

stretching makes a well fit earmold
if not, it is uncomfortable because the skin rubs against the plastic

29
Q

two goals for earmolds

A

go 2mm beyond 2nd bend
stretch aperature

30
Q

what is addition cured silicone

A

combines 1:1 polyvinyl-siloxane parts paste

31
Q

what is condensation cured silicone

A

silicast
dimmethyl-siloxane paste mixed with hardener

32
Q

what are the clinical applications of the 3 impression materials

A
33
Q

what is methyl methaccrylate

A

powder and liquid
used when pt has silicone allergies
not used often

34
Q

what is viscosity for

A

how easy the material flows before it cures
thickness

35
Q

describe high viscosity

A

thick
resistance during flow
condensation cured silicone
stretches aperature

36
Q

describe medium viscosity

A

some stretch to aperture
Addition-cured silicone or methyl-methacrylate

37
Q

describe low viscosity

A

Runny, loose
Flows easily with little resistance
Will not alter anatomical structure of ear canal
Most suitable for devices requiring deep insertion
Addition cured silicone
Used for ear attenuation products & deep fitting HA’s

38
Q

what is the importance of stretching the aperture

A

stretching this area for a well fit earmold
if we do not do this we get an uncomfortable earmold because the skin rubs against the plastic

39
Q

what is stress relaxation

A

materials ability to return to its shape after removal

40
Q

high stress relaxation

A

you can pull on it and it will pop back into shape and won’t change at all

41
Q

ex of high stress

A

silicone
why it is superior

42
Q

low stress relaxation

A

distorts as you pull it out of the ear

43
Q

ex low stress

A

methyl methacrylate

44
Q

what is contraction ratio

A

shrinkage over a 7 day period

45
Q

little shrinkage

A

silicone

46
Q

significant shrinkage

A

methyl mythacrylate

47
Q

what is shore value

A

after cure hardness
stability in impression box

48
Q

______ shore values are more likely to be damaged during shipping

A

low

49
Q

high shore value

A

siliconel

50
Q

low shore value

A

methyl methacrylate

51
Q

Susceptible to heat; requires glue for shipping so it doesn’t distort during shipping

A

methyl methacrylate

52
Q

what are the ear impression steps

A

infection control
case history
otoscopy
otoblock placement
taking the impression
otoscopy

53
Q

What is the ideal length of EMI

A

Ideal placement is 2mm beyond the 2nd bend`

54
Q

what size should foam block b

A

larger than entrance of canal because it compresses and create a tighter block down the canal

55
Q

what size should cotton block be

A

about the same size as the entrance

56
Q

what are the steps to confirm otoblock placement

A

1.Removal string should be in the center of the canal
2.For 2nd bend placements
Visualize the anterior canal bend
Apply gentle pressure to feel bone on anterior canal wall
3.Check for gaps b/w block and canal wall
4.Apply slight pressure to the center of block
It should not move!

57
Q

what are open jaw impressions

A

Increases the size of the aperture for a snugger fit
Condyle of Mandible moves forward pulls on the anterior canal wall

58
Q

single impresion open jaw

A

horizontal placement

59
Q

bilateral impression placement

A

vertical in center of mouth

60
Q

post impression treatment

A

apply pressure to wound for 10 minutes
use large cotton otoblock soaked in vasoconstrictor
recheck ear canal week later
refer as needed

AUDE 5450 AMP 1 (7 decks)

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