Amalgam Restorative Tech

Question 1

Problem concavity areas to watch when placing wedge in gingival margin

Answer 1

Wedge should be placed apical to gingival margin

Problem concavity areas to watch:

Mesial of maxillary 1st premolar
Distal of maxillary 1st molar

Question 2

Amalgam condensation:
Sufficient condensation pressure

Over-fill by how much

Answer 2

5-10 lbs.
Adequately condense each increment, 3 min per mix
Over-fill by 1 mm

Question 3

matrix removal

Answer 3

remove any excess occlusal amalgam adjacent to matrix first
loosen matrix retainer
remove retainer
remove wedge
slide matrix out

Question 4

Burnishing

Answer 4

IPC
Hollenbeck carver

Question 5

Preparation for the finishing and polishing procedures _________________. The smoother the carving, the easier to finish and polish.

Answer 5

Begins with the carving of the amalgam

Question 6

Recountouring with rotary instruments

Answer 6

Slow speed burs are preferably run in reverse
Cooling air-water-spray avoids excessive heat
Most basic re-contouring can be done very CAREFULLY with only 7404 or 7901 high speed burs

Question 7

Initial Polishing: what you use and facts about it

Answer 7

Slow speed rubber cups are used with a flour-of-pumice slurry to produce a smooth surface with a dull lluster

Must be used with intermittent light pressure
Needs slow speed with air or air-water mist, run at 10 K rpm
Can heat up to 300 F in 5 seconds, dry

Question 8

Alternate polishing method

Answer 8

SOflex discs for external contours like class 5 restorations

Graded coarse = darkest color
Fine coarse = lightest color