class III Flashcards
Shade selection is done before or after isolation?
before
When a proximal surface of an anterior tooth is to be restored, and a choice between facial or lingual entry into the tooth is available , which approach is preferable ?
lingual because
1. Esthetics.
2. Shade matching of the composite is less critical.
3. Discoloration or deterioration of the restoration is less visible.
Indications for a facial approach
in class III
-The caries lesion is, positioned facially
-Teeth are irregularly aligned, and facial access would significantly conserve the tooth structure.
-A faulty restoration that originally was placed from the facial approach needs to be replaced.
Initial Access in class III
holding the cutting instrument perpendicular to the enamel surface but at an entry angle that
places the neck portion of the bur or diamond instrument as far into the embrasure.
Light pressure and intermittent cutting (brush stroke) are used to gain access into the preparation.
If the preparation outline extends gingivally onto the root surface, the gingival floor should form a?
cavosurface margin of 90 degrees.
Bevel placement using a needle, flame-shaped, or round diamond burs (……degree angle and a
width of ……. mm)?
45-degree angle and a
width of 0.5 to 2 mm
There are different matrix systems that can be used to restore a class III carious lesion such as :
- Sectional matrix
- Unica matrix
- Mylar strip
After placing the matrix you must ensure that it extends at least ….. mm beyond the prepared…… and ….margins?
At least 1 mm beyond the
prepared gingival and incisal margins.
Flexible discs and finishing strips are suitable for ……surfaces?
convex and flat
oval-shaped finishing burs and polishing points are more suitable for….. surfaces?
concave
can be used in both convex and concave surfaces?
polishing cups
