CAD/CAM Chairside Inlay Fabrication Flashcards Preview

SP16- Operative > CAD/CAM Chairside Inlay Fabrication > Flashcards

Flashcards in CAD/CAM Chairside Inlay Fabrication Deck (32)
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1
Q

What are the two most important steps in the chairside inlay fabrication process?

A
  1. Case Selection

2. Preparation

2
Q

What is the purpose of using powder to capture images?

A

the camera requires a uniformly reflective surface to capture the optical images

  • light = glare = smearing artifacts
  • enamel is too translucent
3
Q

Generally, new users _____-powder.

A

under-powder

4
Q

The Optispray (Sirona product) is a finer particle ____ ______ with a wider spray angle and a _____ color for visibility.

A

titanium dioxide
blue

(spearmint scent/taste)

5
Q

Inadequate powder results in _____ and _____.

A

rough surface and model distortion

6
Q

True or False: Powder should be applied to the entire prep and adjacent teeth.

A

True

7
Q

True or False: Retraction cord should be kept in place during the entire procedure, including bonding.

A

True, removal = bleeding (even though you soak it in hemostatic solution)

8
Q

True or False: You can use a laser to trough gingiva in areas where you need better visibility.

A

True

9
Q

What is the “Standard” or “Basic” Mode?

A
  • designs restorations for posterior only

- allows for minimal adjustments to the proposed design

10
Q

What is the “Master” Mode?

A
  • can be used for restorations in all quads

- allows for major adjustments to the proposed design

11
Q

To avoid a depth-dependent scale resulting from beam divergence, a ______ lens has been introduced into the optical path.

A

Collimating

parallel beams are less reflective and more accurate

12
Q

When holding the camera, use a ____ grasp with a ______ for maximum control.

A

pen grasp

finger rest

13
Q

The _______ (up/down motion) is controlled by using a solid rest (camera stabilizer piece) on an adjacent tooth.

A

pitch

14
Q

The ____ and ____ (horizontal motions) are determined by the path of insertion.

A

yaw and roll

15
Q

The maximum distance between the lens and structures should be _______ in order to get accurate focus.

A

14 mm (cerec 3d)

21 mm for cerec AC

16
Q

On the adjacent tooth, where should the camera stabilizer be placed?

A

marginal ridge and central fossa

17
Q

True or False: When a powder spot occurs on the lens, do not take eyes off the working field.

A

True, hold the camera up to your assistant so they can wipe with a damp 2x2 with alcohol

18
Q

Describe the process for taking an image by using the foot pedal.

A

“Search Mode”: initiated by holding foot pedal
Capture: release of foot pedal
Acceptance: ONE tap of the pedal
Delete: TWO taps of the pedal

19
Q

Why is bite registration used during the imaging process?

A

makes the antagonist model

20
Q

The first of three images will give you the preparation itself and the ______.

A

path of insertion***

21
Q

The Second and third images are of the ____.

A

adjacent teeth

22
Q

Images need to maintain the same angulation and have a ______ overlap.

A

8mm

23
Q

If there is more than one box preparation in the outline form, the recommended taper is ____ for each.

A

15 degrees

24
Q

What is the “distal shadow concept?”

A
  • the infrared beam travels at a 10 degree angle and cannot capture undercuts
  • the missing areas are extrapolated to complete the construction
  • extrapolated areas appear slightly darker on models
  • the software builds a false contour
25
Q

How can false contours be prevented?

A

tilt the camera back on the last image and take one additional image

26
Q

What are the two methods for designing inlays in basic mode?

A
  1. Bite Registration Method

2. Unprepped Tooth Surface/Proximal Tooth Surfaces

27
Q

What are the two options for bite registration material?

A
  1. PVS (TakeOne)

2. Metal-Bite (very rigid, does not require powder)

28
Q

The bite registration material should not extend _____ as it would interfere with camera positioning.

A

vertically

29
Q

How does the “Automated Model Matching” create a model from the prep and the bite registration material?

A

-by using the adjacent teeth to line up the images
(importance of capturing mesial and distal teeth)
-both models (prep/bite) must be the same size, position, and angulation

30
Q

“Automatic Margin Finder” is started with a double click, you can switch to “Manual Finder” and back again by using the _______.

A

space bar

31
Q

When editing contacts and contours, what do the three colors indicate?

A

Red: High Contact >100 microns
Yellow: 50-100 microns
Green: 1-50 microns
Blue: within 1 mm of contact

G = G
Green is the Goal

32
Q

True or False: The blend tool creates a depression where there was a high-spot.

A

False,

“Blend” will relax the surface to a flat contour