CSAR 20 - Try in and cementation

Question 1

How can a temporary crown be removed?

Answer 1

1) Use a carver or spoon excavator under each margin in turn and twist to prise off
2) Use needle hub forceps to grab
3) Section to the lute and insert spoon exactor and twist to fracture temp
4) Use matrix band

Question 2

How is occlusion checked and adjusted when trying in a crown?

Answer 2

1. Shim stock and check new crown has a contact
2. Check reference holding contacts are reproducible from earlier
3. Use articulating paper to mark-up crown
4. Adjust crown contacts until reference contacts are reproduced
5. When ICP is correct move onto dynamic occlusion - lateral excursions and protrusion

Question 3

What material class is panavia and what is it used for?

Answer 3

Self etching dual cure active resin

RBB and adhesive metal restorations

Question 4

What material class is variolink automix and what is it used for?

Answer 4

Self etching dual cure active resin

Cermaic and composite onlays

Question 5

What material class is variolink veneer and what is it used for?

Answer 5

Total etching light cure active resin

Ceramic veneers

Question 6

What material class is Core Cem and what is it used for?

Answer 6

Total etching dual cure active resin

Fibre posts

Question 7

What material crown type should phosphoric acid never be used on and why?

Answer 7

Non-precious metals

Dramatically reduces tensile bond strength

Question 8

Why does a primer have to be used before bonding a precious metal crown?

Answer 8

Don’t have an oxide layer to easily bond to

Sulfur group of VBATDT (panavia alloy primer) in alloy primers bond to precious metal

Question 9

How is panavia opaque used when placing a crown?

Answer 9

NOT dual cure
Remove excess
Apply oxyguard
Wait 3 minutes for chemical cure