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15 Cards in this Set

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What must you not leave on the gingival margin for class 2 composite?
Cannot leave unsupported enamel on the gingival margin. Will have cohesive failure of enamel.
Take a Wieland carve or Sickle scaler to cleave it away. Go below the margin and chip it up.
What about resistance form?
Have a flat gingival floor. Micromechinical resistance form is important but macromechanical retention form isn't important.

You would remove healthy tooth structure to get a flat gingival floor.
Why is a Tofflemire band a bad choice?
Not a good choice. Amalgam is condensed with firm, well directed force and expands to get a contact.
in genreal, they don't work well enough. Must work easily and predictably.
The perfect matrix
-works all the time
-easy and atraumatic
-minimal finishing
-minimum flash
The palodent sectional matrix
Original system that changed posterior composites into an acceptable restoration.
-Section of the circumference of the tooth, precontoured kidney shaped.
Concave side goes gingival.
Describe the wedge for palodent sectional matrix
Regular wooden one that you take the top off of. Slicing the apex off of it, and press it in firmly.
If you have a wrinkled matrix band on the internal surface, you'll have a wrinkled finish.
The bitine ring
Has 2 tynes like a fork. The ring
1. secures the sectional matrix during composite placement.
2. The springiness separates the 2 teeth slightly for the entire placement and the curing.
Once the ring is placed, push the wedge in again. IF you don't, there'll be a little gap.
When etching, what do you want to etch first?
Enamel first for about 30 sec. Then etch is on dentin for no longer thatn 15 sec. 30:37% phosohories acid. Don't blow it really try. Dentin needs to stay somewhat damp. Use dry brush to blot away the pooling of water.
Want water to stay in collagen fibrils.
All are technique sensitive.
Use of flowable composite resin..
Usually done as a first lining step for posterior composites on the gingival floor. Take 23 explorer and spread it out over the entire surface but not near contact point.

-Will set with very littel stress on surrounding walls. Shrink a lot but have low modulus of elasticivity and shrkin less on surrounng walls. Very flexible, adaptive first layer. Then cure it.

-Not strong, not wear resistant. The contact will attrition.
Incremental curing in posterior composites
Much more imporant than anterior composites.
-First one is the flowable
-2nd one is first layer of hybride ocomposite. Must be in thin layer 2 mm and never touching opposing walls when setting.
C factor - configuration factor, ratio of attached: unattached wall. High C factor is bad, low C factor is good. shrinks with low stress that way.

-Also guarantees deep polymerization.
Bulk vs. incremental
builk - easy to place. Pulpal floor forms gap.
Incremental - by sculpting, you minimize the amt of finishing and polishing to do.

Cure it a little longer for class 2.
What should you do more of before you cure?
Sculpting. Get the occlusal surface correct, minimize grinding after it cures.
-minimize surface defects on occlusal surface than anywhere else.
Why not bulk fill?
If you do
you'll get deep polymerization
-C factor problems
-too much stress
-post op sensitivity
In general, when do you want to finish and polish
Finish with the dam on - generating lot of small particle dust.
Polish with teh dam off.
#12 scalpel blade is a must for class 2 post. composites.

Must be careful with discs or else you can get disc ledges. Don't use course discs for this. You'll end up removing too much of the embrasure.
Discs dont do well in dips and fossas. Use mutli fluted carbide burrs and ultrafine diamonds.

Round, football or egg shaped finishing burr (700 4 6 or 8)
What do you use to polish?
fine and super fine discs and optofor points.