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Digital Dentistry 2 > L5 Intra and Extraoral Scan > Flashcards

L5 Intra and Extraoral Scan Flashcards

1
Q

digitalization

A

the conversion of text, pixtures, or sound into a digital form that can be processed by a computer

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2
Q

digitalization

A

the conversion of text, pictures, or sound into a digital form that can be processed by a computer

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3
Q

digital dental impression

A

the conversion of 3D image data of oral and other structures into a digital format that can be processed by a computer

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4
Q

STL (meaning)

A

steriolithography

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5
Q

STL (definition)

A
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6
Q

STL stands for

A

steriolithography

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7
Q

STL (definition)

A

standard tesselation language or standard

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8
Q

STL stands for

A

steriolithography

standard tesselation language

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9
Q

STL files

A

-accepted by most CAD/CAm software
-no information on colors
-no information on internal structures

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10
Q

image capture made by

A

light projection and capture

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11
Q

reconstruction of 3D data

A

matching poitns of interest taken uner different angles

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12
Q

what type of light is captured by the scanner

A

diffuse light

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13
Q

d

A
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14
Q

diffuse reflection

A

the reflection of light from a surface such that incident ray is reflected at many angles, rather than at just one angle

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15
Q

what is detected to reconstruct 3D data?

A

detection of transition areas, such as strong curvatures, physical limits, or difference of gray intensity

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16
Q

what is created to evaluate similarity between images?

A

transformation matrix

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17
Q

resolution (definition)

A

number of points per mm squared

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18
Q

does resolution affect the accuracy of scan?

A

no

19
Q

what affects the accuracy of scan?

A

software advancement

20
Q

depth of view

A

distance between scanner tip and object needed to capture an image

21
Q

is it better to have a fixed or range depth of view?

A

better to have RANGE

22
Q

speed of scanner

A

faster = more convenient

23
Q

are smaller or larger scanners good for capturing hard areas?

A

smaller

24
Q

closed system scanners

A

-sends scan to one of a few software programs for designing or milling

25
Q

main advantage of closed system scanner

A

straightforward flow

26
Q

main disadvantage of closed system scanner

A

limited

27
Q

example of closed system scanner

A

PrimeScan (CEREC)

28
Q

open system scanner

A

sends scans to all other open system software programs for design for milling

29
Q

main advantage of open system scanner

A

versatile

30
Q

main disadvantage of opens ystem scanner

A

complex workflow

31
Q

main disadvantage of opens system scanner

A

complex workflow

32
Q

examples of closed system scanners

A

Trios 4 (3Shape)
emerald (planmeca)

33
Q

caries detection by scanner

A

same / not better than visual detection

potential against histological detection!

34
Q

shade matching by scanner

A

not there yet!

digital intraoral scanner may not be used as an accurate method of shade selection (must confirm with visual verification)

35
Q

2 factors that can affect your scan

A

isolation
retraction and placement of margin

36
Q

isolation and scanner

A

saliva or blood in the scan will appear as hard tissue

scanning in a dry field is a must!

37
Q

retraction and placement of margin and scanner

A

you must be able to clearly visualize your margin so that the scanner can capture it

the scanner does not see what you can’t see!

38
Q

scanning errors

A
  1. contaminated field / unexposed margins
  2. missing data
  3. double scan
39
Q

extraoral scanning

A

-light capture
-reconstruction of 3D data (matching of points of interest taken under different angles)

40
Q

what is different about extraoral scanning

A

-capture area
-moisture control (not an issue)
-double scan (not a problem)

41
Q

is there a difference in accuracy of extraoral vs intraoral scanning?

A

no

42
Q

benefits of intraoral scanning

A

-saves time
-supra or equigingival margins
-hard and attached soft tissue
-severe undercuts

43
Q

benefits of extraoral scanning

A

-saves cost
-subgingival margins
-boarder molding (complete denture)

Digital Dentistry 2 (5 decks)

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