Lecture 2: Final Impressions->Wax Rims

Question 1

_______: Records selected tissues in a displaced (functional) position

Answer 1

Selective Pressure

Question 2

_______: Records the soft tissues in the undisplaced (resting) position.

Answer 2

Mucostatic

Question 3

How long should the patent leave out their current denture before your final impression appointment?

Answer 3

24 hrs

Question 4

CUSTOM TRAY- Mark this line ________ and extend ______mm past it when making your custom tray.

Answer 4

vibrating line (jxn of hard & soft palate)…2-3mm

Question 5

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

Answer 5

border molding

Question 6

What are the 2 categories and 4 OPTIONS for border molding materials?

Answer 6

Categories: 1. Modeling Compound (Options: 1.Green or 2.Red Stick Compound) 2.Elastomeric (Options: 1.Polyether 2.PVS-Heavy Body)

Question 7

________ : Negative registration of an area over which the complete denture will be worn

Answer 7

Final Impression

Question 8

What are the three types of final impression material?

Answer 8

1. Zinc Oxide-Eugenol 2.Polysulfide 3. Polyether/PVS

Question 9

What material am I? Main use is for full-mouth edentulous impressions with no or very minor undercuts for complete denture

Answer 9

Zinc Oxide-Eugenol

Question 10

What material am I? Accuracy of soft tissue impressions (low viscosity)…Stable after setting….Inexpensive

Answer 10

Zinc Oxide-Eugenol

Question 11

What material am I? Disadvantages: Messy….Variable setting time (temperature/humidity)….Non-elastic (fracture if undercuts are present)….Irritating to soft tissue…Can not be disinfected using Birex (Phenols)

Answer 11

Zinc Oxide-Eugenol

Question 12

What material am I? Widely used for full mouth edentulous impressions for complete dentures

Answer 12

Polysulfide

Question 13

What material am I? Advantages: Long working time (4-7 min)… Good tear strength, flow, and reproduction of surface detail….High flexibility for easier removal around undercuts….Low cost compared to polyether

Answer 13

Polysulfide

Question 14

What material am I? Disadvantages: Need custom tray (distortion)…Bad odor/taste…Tendency to run down to the patient’s throat(low viscosity)

Answer 14

Polysulfide

Question 15

Holy cow: how long am I keeping PolySulfide in the Pt mouth for final impressions?

Answer 15

7-8 min

Question 16

How long do you have to pour a PolySulfide impression?

Answer 16

1 hour before distortion

Question 17

What material am I? Used for accurate full-mouth edentulous impressions without severe undercuts Advantages: Pleasant handling and easy of mixing…Good surface detail reproduction and easily poured in stone…If kept dry, good dimensional stability for up to 1 WEEK


Answer 17

Polyether

Question 18

What material am I? Disadvantages…High cost…Storage of impression is critical (water/humidity affect)…Taste objectionable to some patients

Answer 18

Polyether

Question 19

Interesting…Choose a PVS material that has the best ______ qualities.

Answer 19

hydrophilic

Question 20

What material am I? Advantages: Ease of mixing and dispensing…No odor…Ease of clean-up…Stable – does not have to be poured immediately

Answer 20

PVS

Question 21

What material am I? Expensive…Not as hydrophilic…Excessive flow

Answer 21

PVS

Question 22

What are the 4 instructions to give the patient during the maxillary impression?

Answer 22

AFTER 1 MINUTE: Gently pucker…smile…move jaw side to side…forward and back

Question 23

_______: Enclosing an impression to produce a base, to preserve the vestibular contours of the final impression, and to create a land area to protect the cast

Answer 23

BOXING

Question 24

land area must be __-__ mm wide, the base is __-__mm thick

Answer 24

4-5mm..10-15mm

Question 25

What do I use to lute the boxing wax to the impression? How far do you put it from the border of the impression?

Answer 25

sticky wax..3 mm

Question 26

WHEN BOXING THE MAXILLA: The palatal shelf should be oriented parallel to the bench top and approximately __-__mm below the superior periphery of the boxing wax.

Answer 26

15-20mm

Question 27

WHEN BOXIND THE MANDIBLE: The ________ should be oriented parallel to the bench top and approximately 15-20mm below the superior periphery of the boxing wax

Answer 27

alveolar ridge

Question 28

How long do I wait after pouring the boxing master cast? What do I need to do before separating it?

Answer 28

45min to 1 hour..put it in HOT water bath for 5 min

Question 29

_______: A replica of the prepared tooth surfaces (where necessary), residual ridge areas, and/or other parts of the dental arch used to fabricate a dental restoration or prosthesis

Answer 29

MASTER CASTS

Question 30

How thick should the master cast base be?

Answer 30

15mm

Question 31

How deep should the peripheral roll be around the vestibule on the master cast?

Answer 31

1-3mm

Question 32

________: A temporary device representing the base of a denture and used for making jaw relation records/teeth arrangement

Answer 32

Record Base

Question 33

________: An occluding surface usually made of wax

placed on a record base for making jaw relation records and arranging artificial teeth

Answer 33

Wax Occlusion Rims

Question 34

How long do you soak your cast before mounting?

Answer 34

2-3minutes