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21 Cards in this Set

  • Front
  • Back
What is Class III Caries?
smooth surface caries on the proximal surfaces of anterior teeth
What is Class V Caries?
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
What instrument do you use for preparation for class III or V?
330 bur
For Class V, what is the tooth preparation defined by?
extent of notching
What bur is used for the retentive groove in the gingival wall (Class V)?
1/4 round bur
Reasons for beveling
-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)
Purpose of etching
-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
What is the enamel-dentin smear layer?
-Layer on tooth surfaces created by rotary cutting instruments
-Made of loosely bound debris, collagen, and hydroxapatite crystals
What instrument do you use to shape the composite?
PFI Plastic filling instrument; that is lightly wetted with adhesive resin (allows for SHAPING)
What do you use for final polish of composite resin?
-Finest grit disk (Superfine Soflex disk)
-Composite resin polishing paste
How long is enamel and dentin etched for?
15-30 seconds
What is the depth of the largest increment you should place at one time in a composite resin preparation?
Composite resin placed in increments no greater than 2 mm
Finish of composite resin
-Facial or lingual- finishing bur, finishing disks
-Rubber abrasives for composite resin
Outline form for Class III determined by...?
Outline determined by extent of caries or removal of existing defective composite resin being replaced
What is the appearance of the etched surface of enamel and dentin?
-Enamel has frosty appearance
-Dentin should not be dehydrated
should be slightly moist with glossy appearance
No visible water on surface
tell me about light cure composite resin
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
Finish of composite resin -- CLASS III
-Interproximal- Finishing strip
-Facial/lingual- finishing bur, finishing disks
-Gingival- #12 disposable Bard-Parker scalpel
Advantages of a lingual approach to class III caries
-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.
Outline form for CLass III
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
Initial retention form for Class III
box-like shape of the walls-- convergent
Why can unsupported, not friable, facial enamel be left?
since bonding it to the composite resion will tend to suppoer and strengthen it.