Laboratory 10

Question 1

1.!The impressions are disinfected in the laboratory for ____ minutes using Sporicidin spray. After ten minutes, the impressions are rinsed under water and air dried. (This is not done preclinically)

Answer 1

ten

Question 2

2. !Spray ____ into the impression. Pour out the excess.

a. Wait ____ seconds prior to pouring the impression. Do not ____.

Answer 2

debubbilizer
60
rinse

Question 3

**Please note: the following steps (#3-#5) will not be performed in the preclinic, but will be used in the clinic. In the preclinic, to pour the impression, ____ will be used with a ratio of ____ powder:____ water. You will use ____ Die Keen packages with ____ ml of water. (The water must be accurately measured with a graduated cylinder.) You will not utilize a vacuum mixer to mix the die stone, but clinically, it should be utilized.

Answer 3

die keen
60g
13 ml
2
26

Question 4

Place die stone (Type IV) (____ color) in ratio of 200 grams powder and 42 ml distilled water into the vacuum mixing bowl.

Answer 4

ivory

Question 5

**IN ORDER TO AVOID BUBBLES, PLEASE ENSURE THAT THE GAUGE SHOWS A PRESSURE OF AT LEAST ____ PSI DURING THE MIXING PROCESS.

Answer 5

30

Question 6

You are now ready to trim the excess stone with the cast trimmer. Turn the cast trimmer on. The water spray should be on. If it is not, turn the ____ on.

Answer 6

water spray

Question 7

b. The thickness of the cast should be between ____ inch (2 cm)-____ inch (2.5cm) from the ____ edge of the teeth to the bottom of the ____ of the arch.

Answer 7

3/4
1
incisal
base

Question 8

For the preclinic, trim the distal of the cast so it only extends approximately ____mm distal to #17 and #32. It is important that the cast will be able to fit into the rubber mold at a subsequent step. If there is significant excess distal to #17 and #32, it will not fit

Answer 8

2

Question 9

c. The vestibular area should be trimmed ____ to the flat base. BE CAREFUL NOT TO TRIM THE TEETH!

Answer 9

perpendicular

Question 10

Using the integral router unit, trim the lingual of the mandibular arch or the palatal of the maxillary arch in order to remove the excess stone and achieve a U-shaped uniformity of the arch. The cast should be trimmed ____ with ____ pressure. BE CAREFUL NOT TO TRIM THE TEETH!

Answer 10

slowly

minimal

Question 11

ATTENTION: Ensure all of the drilled holes are ____ to each other.

Answer 11

parallel

Question 12

ATTENTION: The ____ setting is required for prepared abutment teeth and teeth ____ to the prepared teeth in order to reduce ____ (movement) of the working dies. For the rest of the arch, ____ dowel pin setting is sufficient. In the preclinic, the double pin setting will only be used for tooth #19

Answer 12

double pin
adjacent
mobility
one

Question 13

b. Carefully, press the platform and base of the stone arch down into the drill until the ____ turns ____ and the hole is established.

Answer 13

laser light

off

Question 14

ATTENTION: There needs to be a MINIMUM ____mm distance ____ between the drilled holes.

Answer 14

3

buccolingually

Question 15

ATTENTION: All drill holes need to line up ____ to ensure a ____.

Answer 15

buccolingually

path of draw

Question 16

ATTENTION: For stabilization, utilize a minimum of one pin per ___ or ___ teeth

Answer 16

tooth

2

Question 17

b. Using the laser light as a guide, align the unprepared tooth/teeth in the
____ of the occlusal table or edentulous space.

Answer 17

center

Question 18

ATTENTION: There needs to be a MINIMUM ____mm distance mesiodistally between each of the drilled holes AND all drill holes need to line up ____ to ensure a ____.

Answer 18

10
buccolingually
path of draw

Question 19

WARNING: Cyanoacrylate sticks skin and eyelids together within ____. USE CAUTIOUSLY!

Answer 19

seconds

Question 20

15. Wait ____ minutes for the cyanoacrylate to dry. Any excess cyanoacrylate can be removed with a cotton tip applicator.
16. Tightly secure plastic sleeves onto the exposed ends of the dowel pins. (The plastic sleeves will ultimately allow the stone base and arch to be ____ from each other.)
    a. Place the plastic sleeve so that the ____ of the sleeve is facing toward the pin head and only the ____ of the dowel pin is exposed.

Answer 20

5
separated
collar
tip

Question 21

ATTENTION: If the plastic sleeve is upside down, it will not slide into the correct position and the tip of the dowel pin will ____. You will need to turn the plastic sleeve around.

Answer 21

not be visible

Question 22

17.!Using a brush, place separator on all stone surfaces, except the ____ and ____. If separator gets on the plastic sleeves, it is not a ____ because it will be washed off during rinsing.

Answer 22

teeth
preparations
problem

Question 23

ATTENTION: Sufficient separating medium is required to ensure separation between the base and the arch so the cast does not ____.

Answer 23

break

Question 24

b. Place a striker plate in the middle of the rubber mold so the letters “MAG” are facing ____ towards the ____ of the rubber mold.

Answer 24

down

base

Question 25

19. You are now ready to mix the stone using the same mixing protocol as was previously used for the arch pour. However, you will be using a different Type IV stone.
    a. Place die stone (Type IV) (____ color). Refer to manufacturer’s directions for the particular stone. We will be using ____ in a ratio of ____ grams powder and ____ ml distilled water into the vacuum mixing bowl. (Flowstone is used exclusively for ____.)

Answer 25

white
flowstone
200
46
bases

Question 26

! **IN ORDER TO AVOID BUBBLES, PLEASE ENSURE THAT THE GAUGE SHOWS A PRESSURE OF AT LEAST ____ PSI DURING THE MIXING PROCESS.

Answer 26

30

Question 27

22. Pour the stone from the vacuum mixing bowl into the rubber mold with the pinned arch centered in place. Continue until stone reaches the ____ of the rubber mold base. This will allow the stone to cover the final cast by approximately ____ mm.
    ! ATTENTION: The ____ should not be used for this step.

Answer 27

top
1
vibrator

Question 28

23. Let the base stone harden for a minimum of ____ minutes.
24. After the stone is set, the rubber mold will be removed in ____ parts.
    a. ! First, remove the plastic baseplate from the ____ of the cast.
    b. Then, remove the remaining ____.

Answer 28

30
two
base
rubber part

Question 29

ATTENTION: Do NOT use a ____ to separate the cast as this will cause the final cast to crack.

Answer 29

buffalo knife

Question 30

b. There should be a MINIMUM ____mm “____” surrounding the trimmed base.

Answer 30

3

land

Question 31

b. Once the gross excess is removed utilize the microscope to carefully define the final preparation margin. Hold the acrylic bur along the ____, NOT ____.

Answer 31

long axis

perpendicular

Question 32

The finished dies should have smooth, distinct margins. You do not want a ! groove around the margins, but rather a ____ taper towards the finish line. There should be no sharp ledges as this will interfere with the subsequent laboratory steps.

Answer 32

gradual

Question 33

Your articulator should be set as follows:
! Condylar inclination ____ degrees
! Bennett angle ____ degrees

Answer 33

30

15

Question 34

Casts MUST be luted with ____ and ____ prior to mounting mandibular cast.

Answer 34

sticky wax

tongue blades

Question 35

The advantage of the 2 step procedure, is that by using a small amount of plaster to initially lute the cast to the articulator, you will have more ____ over contouring the plaster in the second step and you may end up with a ____ mounting with less excess.

Answer 35

control

neater