Operative Quiz

Front 1

What is Class III Caries?

Back 1

smooth surface caries on the proximal surfaces of anterior teeth

Front 2

What is Class V Caries?

Back 2

smooth surface caries on the facial or lingual surfaces of both anterior and posterior teeth at the gingival third; may involve cementum or dentin as well as enamel surfaces

Front 3

What instrument do you use for preparation for class III or V?

Back 3

330 bur

Front 4

For Class V, what is the tooth preparation defined by?

Back 4

extent of notching

Front 5

What bur is used for the retentive groove in the gingival wall (Class V)?

Back 5

1/4 round bur

Front 6

Reasons for beveling

Back 6

-Exposes more reactive ends of enamel rods for better bonding
-Helps establish an esthetic blend composite resin (due to chameleon effect of translucent composite)
-Bevel only in non-stress (non-chewing surfaces) bearing areas (not on occlusal of posterior, not on lingual of Class 3 or Class 4, but for Class 4 you can place a chamfer because of thickness of composite will be at least 0.5 mm)

Front 7

Purpose of etching

Back 7

-Clean tooth surface-- removes the dentin smear layer
-Increase surface area
-Decreases surface energy allowing for resin penetration of microscopically roughened surface
-Depth of microporous layer is approximately 5-50 microns

Front 8

What is the enamel-dentin smear layer?

Back 8

-Layer on tooth surfaces created by rotary cutting instruments
-Made of loosely bound debris, collagen, and hydroxapatite crystals

Front 9

What instrument do you use to shape the composite?

Back 9

PFI Plastic filling instrument; that is lightly wetted with adhesive resin (allows for SHAPING)

Front 10

What do you use for final polish of composite resin?

Back 10

-Finest grit disk (Superfine Soflex disk)
-Composite resin polishing paste

Front 11

How long is enamel and dentin etched for?

Back 11

15-30 seconds

Front 12

What is the depth of the largest increment you should place at one time in a composite resin preparation?

Back 12

Composite resin placed in increments no greater than 2 mm

Front 13

Finish of composite resin

Back 13

-Facial or lingual- finishing bur, finishing disks
-Rubber abrasives for composite resin
Disks
Cups
Bullet

Front 14

Outline form for Class III determined by...?

Back 14

Outline determined by extent of caries or removal of existing defective composite resin being replaced

Front 15

What is the appearance of the etched surface of enamel and dentin?

Back 15

-Enamel has frosty appearance
-Dentin should not be dehydrated
should be slightly moist with glossy appearance
No visible water on surface

Front 16

tell me about light cure composite resin

Back 16

Light cure:
Wave length ~480 nm
Blue wavelength
Use of shield to protect retina from high intensity blue light
Light cure
Facial 20-30 seconds
Lingual 20-30 seconds

Front 17

Finish of composite resin -- CLASS III

Back 17

-Interproximal- Finishing strip
-Facial/lingual- finishing bur, finishing disks
-Gingival- #12 disposable Bard-Parker scalpel

Front 18

Advantages of a lingual approach to class III caries

Back 18

-conserves facial enamel for better esthetics
-color match not as critical
-someunsupported enamel may be left on the facial wall
-any discoloration or deterioriation of the composite will be less visible.
-the lingual surface is less subject to thermal changes.

Front 19

Outline form for CLass III

Back 19

outline will generally follow the shape of the tooth; enter the lingual surface with a #1/2, 1, or 2 round bur, initial outline can be completed with these or #330. Depth of preparation = 0.75-1.25 mm

Front 20

Initial retention form for Class III

Back 20

box-like shape of the walls-- convergent

Front 21

Why can unsupported, not friable, facial enamel be left?

Back 21

since bonding it to the composite resion will tend to suppoer and strengthen it.