Provisional Crown Fabrication for FCC

Question 1

Provisional Restoration

Answer 1

worn for various periods of time which maintains esthetics, provides masticating surfaces, protects hard/soft tissues prior to definitive prosthesis

Question 2

What are the requirements for a provisional restoration?

Answer 2

1. biologic/pulpal protection
2. mechanical/occlusal stability
3. esthetic satisfaction

Question 3

Pre-fabricated provisional restoration

Answer 3

can only be used for single tooth restorations

Question 4

Custom provisional restoration

Answer 4

used for single or multiple tooth restorations

Question 5

PMMA Advantages

Answer 5

1. wear resistance
2. good strength
3. color stability
4. polishability
5. esthetics
6. low cost

Question 6

PMMA Disadvantages

Answer 6

1. high curing heat
2. polymerization shrinkage
3. residual monomer
4. working time
5. odor

“Imagine your mama curling her hair in the afternoon. Her hair is shrinking into curls, causing monomers of hair and odor to drift into the room. It takes her a long time.”

Question 7

PEMA Advantages

Answer 7

1. low curing heat
2. good marginal fit
3. lower polymerization shrinkage than PMMA
4. low cost

Question 8

PEMA Disadvantages

Answer 8

1. wear resistance
2. esthetics
3. color stability
4. unpleasant odor
5. EXTENDED WORKING TIME

Question 9

Bis-acryl Composite Advantages

Answer 9

1. low curing temp
2. low polymerization shrinkage
3. high tensile strength
4. high surface hardness
5. improved marginal fit
6. good color stability
7. minimal odor
8. high polishability

Question 10

Bis-acryl Composite Disadvantages

Answer 10

1. expensive
2. difficult to repair
3. BRITTLE-NOT GOOD FOR LONG SPAN

Question 11

VLC Composite Resin Advantages

Answer 11

1. low polymerization shrinkage
2. high tensile strength
3. minimal exothermic setting rxn
4. good color stability
5. no odor
6. easy to add material

Question 12

VLC Composite Resin Disadvantages

Answer 12

1. expensive/need a machine
2. limited shade selection
3. low marginal integrity
4. polishability

Question 13

Types of Direct Provisionals Used at MUSoD

Answer 13

1. pre-fab crowns

2. pull-down matrices

Question 14

Pull-down technique

Answer 14

1. take an alginate impression and make a cast before tooth prep
2. Use a vacuum former over the cast with a 0.5 mm square thermoplastic sheet
3. place two vent holes over the non-functional cusps
4. put vaseline over teeth
5. put liquid into retainer and have patient bite down
6. during curing, do and in-and-out motion to avoid locking
7. check setting of material
8. mark interproximal contact of untrimmed provisional
9. trim using a lab handpiece
10. mark finish line
11. open contact
12. open margin
13. check occlusion with and without crown
14. add anatomic groove detail
15. polish