PPT 2

Question 1

What are the standard starting measurements for the occlusal wax rims?

Answer 1

22 mm maxillary

18 mm mandibular

Question 2

What are the chances the wax rims will not need adjustments?

Answer 2

Slim to none

Question 3

Why are we concerned about space?

Answer 3

1. room to swallow
2. room to chew
3. Room to enunciate words
4. Room for max and mand arches
5. Room for max and mand teeth
6. Room to look and feel confortable

Question 4

What must be visible in the premaxillary area in your cast

Answer 4

Fremum notch

Question 5

What 2 structures must you be especially careful not to cut short?

Answer 5

Retromolar pad area and Hamular notch area

Question 6

How wide should the land areas of the cast be?

Answer 6

3-4 mm

Question 7

What should you do to the tongue space of the cast and why?

Answer 7

Tongue space should be reduced flat to access the lingual undercuts

Question 8

Why should land areas on the cast be reduced?

Answer 8

To access undercuts

Question 9

Why must you take extra care to preserve your casts?

Answer 9

Because they are used in processing the final dentures

Question 10

How thick should the cast be in the palate and tongue area?

Answer 10

13mm

Question 11

What must be done prior to the second patient visit?

Answer 11

The preliminary casts must be poured and a custom tray made

Question 12

During the 2nd patiend visit (final impression appt), the tray is tried in the mouth and adjusted to be ________, then border molded with ______, and then a ______ is taken

Answer 12

Adjusted to 2 mm short of the vestibule; Border molded with compound; Final impression taken

Question 13

What should you find during the 2nd (final impression) appt.

Answer 13

If possible, find the location of the posterior palatal seal and scribe it into the maxillary master cast

Question 14

What should be done directly after the 2nd (final impression) appt?

Answer 14

The impression must be boxed and poured,
the master cast must be trimmed,
and a record base and occlusal rims are made

Question 15

Why do we insist upon using a single sheet of base plate wax for the spacer?

Answer 15

To ensure an even thickness of the impression material (1mm specifically)

Question 16

What impression material is used for the final impression?

Answer 16

PVS (elastic impression material)

Question 17

How can you make sure that the custom trays are at least comfortable for your patient (5 things)?

Answer 17

1. Remove all undercuts
2. No rough edges
3. No sharp edges
4. No scraping tissue
5. Stable seating is accomplished

Question 18

What is the procedural order for bordermolding?

Answer 18

1. obtain green stick
2. insert green stick into fire
3. goop melty green compound onto custom tray
4. Dunk in water bath
5. Put in patient’s mouth

Question 19

What is the definition of border molding?

Answer 19

Shaping of an impression material by the manipulation or action of tissues adjacent to the borders of an impression tray

Question 20

What is the objective of border molding?

Answer 20

To determine the contours, height and width of the borders of the complete denture

Question 21

During border molding we use the ____ technique to make an impression of the vestibule during function

Answer 21

Selective pressures technique

Question 22

What is the objective of the selective pressures technique?

Answer 22

To manipulate the tissues in such a way as to get them extended so that the patient may be allowed to perform maximum movements before actually engaging the denture and moving it.

Question 23

Is wax spacer kept in during border molding?

Answer 23

Yes!

Question 24

Is wax spacer kept in during impression taking?

Answer 24

No!

Question 25

What are the two sources of fire we use to melt green compound?

Answer 25

1. Bunson burner | 2. Hanau torch

Question 26

What do we do before placing gooey green compound into patient's mouth

Answer 26

Always temper the compound in a water bath 3-5 seconds before placing in the mouth to avoid serious burns

Question 27

What is the temperature of the water bath?

Answer 27

140 degrees

Question 28

Why is the water bath 140 degrees?

Answer 28

140 is slightly HIGHER than the FUSION temp of the compound, so the compound will still be PLASTIC when placed in the mouth

Question 29

What happens if you take too long between tempering and putting try in patients mouth?

Answer 29

The compound hardens and you have to peel it of and start over

Question 30

What size increments should the compound be?

Answer 30

Small

Question 31

What should be placed in the area where you will do border molding prior to using the PVS specifically?

Answer 31

Adhesive

Question 32

After completing border molding, what is the next step?

Answer 32

Scrape excess compound and remove the wax spacer

Question 33

What is the purpose of triad stops

Answer 33

To keep tray from over-seating

Question 34

What should you add after removing the wax spacer?

Answer 34

Adhesive

Question 35

Which PVS should you use in place of the green compound (border molding)?

Answer 35

Heavy body

Question 36

What should the second wash impression cover?

Answer 36

The original border molding

Question 37

How do you make a supportive base?

Answer 37

1:1 plaster:pumice mixture with enough water for the mix to be smooth and creamy

Question 38

What should the size of the land area be when creating a supportive base?

Answer 38

4mm even racetrack land area exposed

Question 39

What is the purpose of the supportive base?

Answer 39

1. To enclose an endentulous impression 2. To preserve the vestibular contours of the final impression 3. To protect to cast 4. To create a land area 5. To establish an area to process against

Question 40

Define luting

Answer 40

A substance used to pack and seal pipe joints, and other connections, or coat a porous surface in oder to make it tight (A SEAL)

Question 41

Describe the luting process

Answer 41

Lute (heat seal) 2 strips BEADING wax exenly around the peripheral borders of the entire edentulous impression (including tongue area) before pouring in stone

Question 42

What will over-vibrating cause?

Answer 42

separation of the wax while pouring the stone

Question 43

Should you crowbar your cast/pumice-plaster matrix apart?

Answer 43

No, soak in hot water for 15 minutes to soften the total impression and wax used to define the land areas

Question 44

What happens if you break or over-trim your master cast

Answer 44

Must retake the final impressions with border molding

Question 45

What is a master cast for complete dentures

Answer 45

An accurate replica of the residual ridge areas, and other parts of the dental arch upon which a complete denture prothesis is fabricated

Question 46

What must be done to the master cast before making the base plates?

Answer 46

Protect cast by blocking out all undercuts

Question 47

What causes a marred (broken) surface of the master cast?

Answer 47

Not blocking out undercuts or properly lubing cast before making the base plates

Question 48

What is the downfall of the REQUIRED step of blocking our undercuts?

Answer 48

Lack of retention

Question 49

What are the 7 names for base plates?

Answer 49

``` Base plate Occlusal rim Record bases Wax rims Templates Interim bases Record rim ```

Question 50

What are occlusal rims?

Answer 50

Wax pillares places on base plates Adjusted to record patient's interocclusal jaw relationship Serve as guides for properly setting teeth Serve as guides to establish proper contours of denture base

Question 51

Since we are doing split mounting, what should be done to the cast?

Answer 51

Put grooves in the bottom for retention to articulator