Quiz 5 stuff - Class III composite / Class III preps

Question 1

Class III Outline form influenced by ____ and ____

Answer 1

lesion size and location.

Question 2

lingual approach is ALWAYS recommended even when there is overlap of teeth on the lingual surface with caries

T/F

Answer 2

= F (access from facial surface)

Question 3

indications for a facial approach

Answer 3

o extensive caries on the facial side
o no caries at all on the lingual
o faulty restoration that needs to be replaced (recurrent decay)
o overlap of teeth = blocks lingual approach for you

Question 4

of external walls for class III?

Answer 4

Gingival Wall
Axial Wall
Lingual Wall
Incisal Wall

Question 5

walls for lingual access =

Answer 5

gingival, incisal, facial, axial

Question 6

use a no. 6 round bur to start prep =

T / F

Answer 6

= F (#2 or smaller burs)

Question 7

0.2 mm into dentin

T / F

Answer 7

F. .5 mm into dentin

Question 8

Which external walls do you break contact in class III?

Answer 8

gingivally and facially.

Incisal NEVER break contact.

Question 9

incisal margin is in the middle of the contact area

T / F

Answer 9

True.

does not break the contact.

Question 10

Where do you bevel in class III? what measurements for bevel?

Answer 10

all accessible margins only. not all margins.

.5 mm 45 degree bevel on all accessible margins.

Question 11

Where is the incisal margin located?

Answer 11

middle of contact margin. very important!

Question 12

incisal gingival height:
axial wall depth:

Answer 12

1.5-2mm
1-1.2 mm in dentin.

Question 13

Retention form for class III

Answer 13

.5 mm bevel on all accessible margins

Question 14

Resistance form for class III

Answer 14

avoid fracture of tooth = resistance form.

90 degree exit angles.

Question 15

for facial approach, you want to bevel…

Answer 15

more than = 1 mm

Question 16

class III axial depth is 1.0-1.5

T / F

Answer 16

False

1-1.2 mm axial depth

Question 17

dimension of breaking gingival contact:

Answer 17

.5 mm max