Quiz 1 Stuff - Class II prep technique

Question 1

Resistance Form for Class II cavity prep:

Answer 1

Resistance = avoid fracture of tooth and filling.

Pulpal floor depth: 1.5- 2.0 mm
.5 mm to dentin
90 degree cavosurface margin
axial walls parallel to long axis of tooth
parallel to DEJ
removal of unsupported enamel to avoid tooth fracture
M/D wall divergence to avoid undermining marginal ridge
rounded internal line angles
beveled axio-pulpal line angle

Question 2

245 bur diameter:

Answer 2

.8 mm

Question 3

Composite Retention:

Answer 3

.5 mm 45 degree Bevel along Lingual and Buccal extensions of the box

201.3 bur

Question 4

amalgam retention:

Answer 4

retentive grooves at axio-buccal line angle and axio-lingual line angle.

.25 mm at deepest point, fade out at DEJ.

Question 5

Mesial / Distal should be

Answer 5

Slightly divergent

Question 6

Retention for Class II preps:

Answer 6

Flat pulpal floor
dovetail
B/L wall convergence
Perpendicular to long axis of tooth - gingival floor
Composite = bevel proximal box enamel margins (45 degree, .5mm bevel)
Amalgam = retentive grooves at A-B line angle and A-L line angle. (.25 mm deepest point, fade out at DEJ)

Question 7

Gingival floor: ___ mm into dentin:

Answer 7

.5 mm into dentin