external surface form, interim restoration

Question 1

what tray do you use to make an external surface form

Answer 1

Quadrant tray

Question 2

What is used to create an external surface form

Answer 2

A vacuum-formed Matrix

Question 3

How should the vacuum formed matrix be trimmed

Answer 3

4-5mm from the gingival margin

Mesial of 6 to mid of 1

Question 4

Biologic requirements of interim restorations

Answer 4

Protect pulp
Maintian periodontal health
Occlusal compatibility
Maintain tooth position
Protect against fracture

Question 5

Mech requirement of interim restoratiosn

Answer 5

Resists functional loads
Resist removal forces
Maintain interabutment alignment

Question 6

Esthetic requirement of interim restorations

Answer 6

Easy to contour
Color compatibility
Color stability
Translucency

Question 7

3 requirements for interim restorations

Answer 7

Easthetic
MEchanical
Biologic

Question 8

What are the dental tubules after a crown prep

Answer 8

Open to the pulp so now sensitive

Question 9

how to isolate the dentin from the oral environment

Answer 9

Use a provisional

Question 10

What must be done to ensure that provisionals protect periodontal health

Answer 10

Magins must be done well

Correct contour

Question 11

what happens to perio if too much contour

Answer 11

Inflammation and irritation

Question 12

why does the provisional need to be in correct occlusion

Answer 12

Keep opposing tooth from supper erruption

Question 13

How removable should a provisional be

Answer 13

Needs to be centered with a good fit

But also needs to be adjusted without fracture

Question 14

what is the external surface form

Answer 14

The mold

Question 15

What is the tissue surface form

Answer 15

The preped tooth

Question 16

Types of external surface forms

Answer 16

Custom

PReformed

Question 17

How is a custom external form made

Answer 17

use a polypropylane shell from a suck down on an impression

Question 18

What are the types of preformed external surface forms

Answer 18

Resin: polycarb, Cellulose acetate
Metal: aluminum (plain), aluminum (anatomic), tin-silver, Nickel-chromium

Question 19

Pros and cons of using a suckdown

Answer 19

Thin so good reproduction

Can also break

Question 20

Pros and cons of putty for external form

Answer 20

Flexible

But can’t see how acrylic is forming

Question 21

Why use wax for external form

Answer 21

If you’re cheap

Question 22

How to chose a preformed polycarbonate provisional

Answer 22

measure space
Select crown
Try on patient
adapt

Question 23

what is the finish margin for an aluminum preformed crown

Answer 23

Resin is the finish, not the metal

Question 24

MEthods of Fabrication of Provisional restorations

Answer 24

Indirect
Direct
Indirect-Direct

Question 25

Advantages of Direct provisional restorations

Answer 25

pateints preped teeth and gingival tissues directly provide the TSF
no intermediate steps of the indirect technique

Question 26

when are direct provisional restorations convenient

Answer 26

When office laboratory facilties are inadequate for efficiently producing an indirect restoration

Question 27

Disadvantage of Direct provisional

Answer 27

Potential tissue trauma from the polymerizing resin and inherently poorer marginal fit

Question 28

Ideal properties of interim fixed restorations

Answer 28

Convenient handling: adequate owrking time, easy molding, rapid setting
Biocompatibility (non-toxic, non allergic)
Dimensional stability during solidification
Ease of contouring and polishing
Adequate strength and abrasion resistance
Good appearance
Good acceptability to patient: nonirritating, odorless
Ease of adding to or repairing
Chemical compatibility with interim luting agents

Question 29

What must be done if External surface form is hard to remove

Answer 29

Might need to block out undercuts

Question 30

Why pump the ESF 2mm

Answer 30

While it is setting at a rubber stage to preventing lockin in and overheating the teeth

Question 31

Sequence of Polishing

Answer 31

Acytlic bur
Moore disks
Burlow wheels on the margins and axial
Diamond on the occlusal
Rubber points on occlusal if needed

Question 32

Criteria for an interim restoration

Answer 32

Proximal contacts
Occclusion
Margins
Axial Contours
Finish