Crowns

Question 1

what is the occlusal reduction for metal crowns

Answer 1

1-1.5mm

Question 2

what is the margin used for preparing teeth for metal crowns

Answer 2

1.5mm buccal shoulder on aesthetic areas
chamfer margin on non-aesthetic areas

Question 3

what is the occlusal reduction required for all ceramic and metal ceramic crowns

Answer 3

1.5mm - 2.0mm

Question 4

what is the circumferential margin required for all ceramic crowns

Answer 4

1.5mm-2mm buccal shoulder - aesthetic margins
non-aesthetic margins = chamfer

Question 5

what impression material is used to take an impression of the prepared crown prep to send to the lab

Answer 5

PVS
polyniylsiloxane

Question 6

what are the six principles of tooth preparation

Answer 6

preserve tooth structure
retention and resistance
structural durability
marginal integrity
preservation of the periodontium
aesthetic considerations

Question 7

how should crown margins be left to preserve the periodontium

Answer 7

smooth and exposed to cleansing action
placed where dentist can finish them and patient can clean
placed at gingival margin

Question 8

what are the options for crown materials

Answer 8

metal crown
ceramic crown
metal ceramic
all ceramic (porcelain bonded to alumina or zirconia)

Question 9

what influences which type of crown material you will use

Answer 9

aesthetics
least destructive to tooth tissue
least destructive to opposing teeth
best suited to bruxist