Class 1 w/extension

Question 1

Box

Answer 1

Dimensions of depth on the tooth.

Question 2

Bur orientation - Man 1st premolar

Answer 2

Lingual cusp short and tiny - acts more like cingulum of mandibular canine. Buccal cusp is large - very comparble to canine in a way. Huge transverse ridge that should not be crossed if possible.

If transversed ridge crossed, pulpal floor cannot be perpendicular to axis.

Pulp chamber always follows outline - will be high up on buccal surface. If you go directly with tooth axis, you can either undermine lingual cusp or get too close to pulp.

Can’t drill with the occlusal plane, as you go right at pulp.

*Instead go at an angle between occlusal plane and long axis.

Question 3

Class 1 w/extension

Answer 3

pit and fissures caries including occlusal and buccal/lingual surfaces of posterior teeth (molars mainly). Usually in distal pit, distolingual pit and involving distolingual groove. Do not cross oblique ridge.

Question 4

Compound

Answer 4

Multi surfaces - class 1 w/extension or compound class 1. Either name works.

Question 5

OL cavity prep

Answer 5

In distal pit, distolingual pit and involving distolingual groove. Do not cross oblique ridge. Maxillary molars.

Question 6

OB cavity prep

Answer 6

Occlusal and a buccal fissure - mandibular molars.

Question 7

OB DEJ

Answer 7

Will just barely lift up compared to normal class 1 in buccal groove.

Question 8

Pulpal floor -OB

Answer 8

pulpal floor assumes occlusal elevation (this will go with DEJ, which will get slightly shallower) - Use a 245 to drop the box

Question 9

Axiopulpal line angle

Answer 9

When dropping the box, you have to round the axiopulpal line angle. Follow the curvature of the buccal surface. Axial depth of 1 to 1.2 mm is ideal.

Question 10

Mesial and distal walls

Answer 10

converging occlusaly.

Question 11

Concentricity

Answer 11

Static test - measures if some blades were designed shorter than others. How closely single circle touches the tip of all blades. On manufactural level.

Question 12

Run out

Answer 12

A function or a dynamic test. Push the rheostat if the bur head is displaced from its long axis when it rotates. EX - off center head or bent neck.

Question 13

Accufilm - articulating paper

Answer 13

Marking

Question 14

Study tray setup

Answer 14

**

Question 15

330 convergent error

Answer 15

Don’t angle too much, it will cause rounding of wall.

Question 16

Depth of class 1

Answer 16

1.5 - resistance form - this is based on amalgam. Any deeper can affect the pulp.