Class II

Question 1

involves the proximal surface of posterior dentition.

Answer 1

Class II

Question 2

where does caries typically develops on a proximal surface

Answer 2

immediately gingival to the proximal contact.

Question 3

Ditch cut

Answer 3

The operator holds the instrument over the DEJ, parallel to the long access of the tooth, with the tip of the instrument positioned to create a gingivally directed cut that is 0.2  mm inside the DEJ.

Question 4

in class II sharp hand instrument such as……… can be used to finish the enamel wall?

Answer 4

chisel, hatchet, or a gingival margin trimmer

Question 5

in class II Tofflemire or sectional metallic matrices?

Answer 5

Although a Tofflemire-type matrix band can be used for restoring a two-surface tooth preparation, precontoured sectional metallic matrices are preferable

Question 6

in class II when choosing the matrix if both proximal surfaces are involved we use?

Answer 6

a Tofflemire retainer with an ultrathin (0.025  mm) and burnishable matrix band