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Advanced Restorative > Digital Technologies Part 2 > Flashcards

Digital Technologies Part 2 Flashcards

1
Q

most chairside milling machines are:

A

4 axis mill

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2
Q

most laboratory milling machines are:

A

5 axis mill

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3
Q

describe the 4 axis mill

A
  • burs move in 3 axes X,Y and Z
  • material/block rotates in 1 additional axis (3+1 milling machine)
  • the addition of the 4th axis (A axis) allows the block to automatically rotate 180 degrees so that it can mill intricate details
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4
Q

describe the 5 axis mill

A
  • the milling block is rotated in additional axes
  • can mill complex designs such as implant superstructures, RPD frameworks, complete dentures
  • the milling block is rotated in additional axes
  • can mill more complex designs such as implant superstructures, RPD frameworks, dentures
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5
Q

what is the difference in speed between the 4 axis mill and the 5 axis mill

A
  • 4 axis mill faster in single restorations
  • 5 axis mill faster in multiple restorations
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6
Q

what is the difference in block size between the 4 axis mill and the 5 axis mill

A
  • 4 axis mill: max 80 x 16mm
  • 5 axis mill: 98.5 x 30 mm
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7
Q

what is the difference in undercuts between the 4 axis mill and the 5 axis mill

A

4 axis mill: disabled
- 5 axis mill: limited

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8
Q

what is the difference in indications between the 4 axis mill and the 5 axis mill

A
  • 4 axis mill: crown and short FPD
  • 5 axis mill: long FPD and dentures
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9
Q

accuracy and resolution is _____ related to the number of axes

A

not

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10
Q

what materials are used in a wet mill

A

-lidisilicate
- feldspathic porcelain
- Co-Cr metal

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11
Q

what materials are used in dry mill

A
  • resins
  • Zr
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12
Q

what materials are used in dry and wet mills

A
  • Zr
  • some metals such as titanium
  • resins
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13
Q

the liquid in a wet mill is:

A

a combination of distilled H2O and another liquid (manufacturer specific)

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14
Q

describe the maintenance on dry and wet milling

A
  • still required with a dry mill
  • dry and wet mills can vary in the level of maintenance required and level of noise during operations
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14
Q

describe the functional movement of the bur

A
  • bur movement is related to the tooth preparation
  • successful tooth preparation is required for successfully milling
  • bur dimensions influence the milling outcome
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15
Q

the margin of the restoration should be at least ____ of the width of the bur tip

A

1/2

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16
Q

cusp/fossa has to be at least as wide as:

A

the diameter of the bur

17
Q

tooth preparation cannot exceed the height of:

A

the bur

18
Q

margin thickness depends on:

A

bur size and crown material

19
Q

what is the pre acquisition checklist

A
  • administration tab complete
  • correct material selected
    -patient evaluation
  • scanning armamentarium
    -optragate or isovac placed
    -proper isolation
20
Q

what is done in patient evaluation for cadcam

A
  • maximum opening
  • tongue size
  • cheek elasticity
  • buccal fat pad
  • third molars
21
Q

what is the scanning armamentarium

A
  • isovac or optragate
  • 4x4 guaze
  • cotton rolls
  • mirror
  • forceps
22
Q

what is the depth of field for scanners

A

0-16mm

23
Q

what are the golden rules of scanning

A
  • always start on an area that the scanner knows and then slowly blending in the new area
  • if it ever freezes or loses its place stop and remove the scanner and reposition to a known location
24
Q

what are the prepped quadrant scanning steps

A
  • occlusal
  • buccal
  • lingual
  • distal interproximal
  • mesial interproximal
  • corrective scans
25
Q

what is done in the scan evaluation

A
  • examining for missing areas in the scan
  • we need to capture the complete prep and adjacent interproximals
  • fix each missing area individually with a short scan
  • repeat for each missing area
  • be careful not to make the scan file too large
26
Q

what is the opposing quadrant scanning steps

A
  • occlusal
  • buccal
  • lingual
  • corrective scans
27
Q

if you cannot get it to begin a scan or recognize teeth you can use ____ to help the scanner pick it up

A

optispray

28
Q

what are the design steps

A
  • define margin
  • design morphology
  • ensure the restoration fits the arch
29
Q

how do you define the margin

A

use the double click to enter editing mode and then draw in the areas you want to replace then double left click to reconnect it to the margin

30
Q

how do you change the moprhology

A

add, smooth, subtract

31
Q

what color do you want for contacts

A
  • we want to have light blue for the interproximal contacts and occlusal
32
Q

for zirconia what should the contacts be

A

add a little green at the occlusal portion of the interproximal contact

33
Q

what are the milling steps

A
  • milling the crown here in 250
  • firing or sintering
  • glazing
34
Q

what are the milling steps

A
  • fill our the cerec block form and get the block from mary jane
  • enter the barcode here and hit start
35
Q

what are the cerec MC XL zirconia burs

A
  • finisher 10
  • shaper 25 RZ
36
Q

what are the cerec MC XL lithium disilicat eburs

A
  • step bur 20
  • cylinder pointe bur 20S
37
Q

what are the steps after milling for zirconia

A
  • find which of the speedfire units the job got sent to, select it, then “pre drying and sintering”
  • place the crown intaglio side up and start it (add 15 mintues to cool) dont touch when the temperature on the screen is over 250
  • take the crown to chris to glaze
38
Q

what are the steps after milling for emax

A
  • take the crown up to chris to fire and glaze
  • do not use the speedfires here in 250
39
Q
A

Advanced Restorative (17 decks)

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