CAD/CAM Chairside Inlay Fabrication

Question 1

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

Answer 1

1. Case Selection

2. Preparation

Question 2

What is the purpose of using powder to capture images?

Answer 2

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

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

Question 3

Generally, new users _____-powder.

Answer 3

under-powder

Question 4

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

Answer 4

titanium dioxide
blue

(spearmint scent/taste)

Question 5

Inadequate powder results in _____ and _____.

Answer 5

rough surface and model distortion

Question 6

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

Answer 6

True

Question 7

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

Answer 7

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

Question 8

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

Answer 8

True

Question 9

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

Answer 9

• designs restorations for posterior only

- allows for minimal adjustments to the proposed design

Question 10

What is the “Master” Mode?

Answer 10

• can be used for restorations in all quads

- allows for major adjustments to the proposed design

Question 11

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

Answer 11

Collimating

parallel beams are less reflective and more accurate

Question 12

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

Answer 12

pen grasp

finger rest

Question 13

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

Answer 13

pitch

Question 14

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

Answer 14

yaw and roll

Question 15

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

Answer 15

14 mm (cerec 3d)

21 mm for cerec AC

Question 16

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

Answer 16

marginal ridge and central fossa

Question 17

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

Answer 17

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

Question 18

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

Answer 18

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

Question 19

Why is bite registration used during the imaging process?

Answer 19

makes the antagonist model

Question 20

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

Answer 20

path of insertion***

Question 21

The Second and third images are of the ____.

Answer 21

adjacent teeth

Question 22

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

Answer 22

8mm

Question 23

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

Answer 23

15 degrees

Question 24

What is the “distal shadow concept?”

Answer 24

• 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

Question 25

How can false contours be prevented?

Answer 25

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

Question 26

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

Answer 26

1. Bite Registration Method

2. Unprepped Tooth Surface/Proximal Tooth Surfaces

Question 27

What are the two options for bite registration material?

Answer 27

1. PVS (TakeOne)

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

Question 28

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

Answer 28

vertically

Question 29

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

Answer 29

-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

Question 30

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

Answer 30

space bar

Question 31

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

Answer 31

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

Question 32

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

Answer 32

False,

“Blend” will relax the surface to a flat contour