Provisional Restorations

Question 1

list 5 ways to make provisional restorations

Answer 1

preop impression
preformed crown
preop wax up followed by duplication and vacuum formed stent
free hand bisacryl resin
use old crown if there is one

Question 2

what materials can be used for preformed crowns?

Answer 2

polycarbonate - “directa”, only works w/ cold cure acrylic resin
cellulose acetate - fill w/ protemp
composite - half cured crowns, malleable and moldable, cure once pt bits down to attain occlusion
metal - rarely used now, often inferior results

Question 3

preop wax up followed by duplication and vacuum formed stent - when is this technique chosen?

Answer 3

usually for multiple teeth and when we want to change occlusion

Question 4

how should temp occlude in ICP and excursions?

Answer 4

should not occlude/touch other teeth during these movements

Question 5

what happens if crown prep has undercuts?

Answer 5

provisional restoration will not withdraw from prep or will tear on removal

Question 6

what thickness of provisional or event suggests you have not removed enough on your crown prep?

Answer 6

if provisional is <0.5mm thick
or if provisional is cut through accidentally

Question 7

at what stage should provisional be made?

Answer 7

after tooth prep but before impressions i.e. impressions after the provisional has been made and ensured it is satisfactory

Question 8

when else should impressions be taken?

Answer 8

after provisional is made