Quiz 2 stuff - amalgam restorative tech. Flashcards
retentive grooves is an extra retention in amalgam. T / F
True
Proper band placement below / above GM = ___ mm.
BELOW GM, 1 mm.
Purpose of matrix band:
create artificial wall during placement of restorative material
confine material within prep
re establish proper contours and contact with adjacent tooth
provide for a smooth proximal surface
Purpose of wedge:
seal gingival margin
prevent overhang
compensate for thickness of matrix band by physically separating teeth.
Proper band placement above / below marginal ridge = ___ mm
ABOVE marginal ridge, 1-2 mm.
Retainer placement:
Open slotted side of retainer towards what?
Gingival
Small knob =
large knob =
small: secure matrix band
large: tighten band around tooth.
wedge should be placed ____ to gingival margin
problems to watch:
apical
problem concavity areas to watch: mesial of max 1st premolar, distal of max. first molar
Over-fill amalgam by how much?
1 mm.
**preparation for the finishing and polishing procedures begins with _____________.
Begins with the carving of the amalgam.
Finishing process vs polishing process:
Finishing process: prepares surface for final polishing. recontour with rotary instruments (preferably slow speed burs in reverse)
Polishing process: initial polishing with slow-speed rubber cups. Must be used with Intermittent light pressure. can also do soflex discs
slow-speed rubber cups and pumice are used for finishing procedure
T / F
False. Used for polishing.
soflex discs are used to define anatomic grooves during finishing procedure
T / F
False
anatomic grooves = 7404
convex contours = 7901/soflex discs
finishing procedure accomplishes all except:
a. removes excess amalgam
b. defines major anatomic grooves
c. smooths the surface of set amalgam
d. produces surface luster
D.
(this is what polishing accomplishes) +
discourages plaque accumulation
promotes good periodontal health
presents a smoother surface for the tongue
