Class II Quiz 8 Exam 3

Question 1

Class II lesion

Answer 1

smooth surface lesion, in the proximals of post teeth

Question 2

Once lesion hits DEJ

Answer 2

Takes path of least resistance so the caries spreads laterally

Question 3

Why caries spread laterally

Answer 3

path of least resistance, once hits DEJ; form cones with tips towards pulpal tissues

Question 4

Line Angle

Answer 4

Jcn of two walls

Question 5

Jcn of three walls

Answer 5

point angles

Question 6

Internal walls

Answer 6

Axial and pulpal walls

Question 7

Diagnosis clinically

Answer 7

Chalky, opaque area, grey area in color

Question 8

Best method for determining a Class II lesion

Answer 8

Radiograph; able to see incipient (start) lesions

Question 9

When do we treat Class II lesions if previously unrestored

Answer 9

Cone goes through all of enamel to dentin/DEJ-consider looking at restoring

Question 10

Modifying factors for restoration of Class II

Answer 10

poor OH, education, socioeconomic status, caries risk

Question 11

Previously restored when do we treat Class II

Answer 11

Fractured restoration, overhang/flash, light or no proximal contacts, poor marginal integrity, non physiological contours

Question 12

Indications for Class II/ radiographically

Answer 12

Changing…

Question 13

Class II prep vision

Answer 13

indirect

Question 14

Outline form of Class II considerations

Answer 14

anatomy-pits and fissures; soft and hard tissue adjacent-gingival embrasures and B and L

Question 15

Resistance form of Class II

Answer 15

internal walls in dentin layer- because has a little more give to it than enamel b/c amalgam is brittle
90 degree cavosurface margis
Flat gingival floor/seat
Rounded internal line angles (pulpal floor and gingiva)
adequate pulpal depth
Preserve tooth structure

Question 16

Retention of Class II

Answer 16

Dovetails, convergent proximal walls, convergent occlusal walls, proximal locks-proximal retention grooves (placed .5 mm inside DEJ)

Question 17

Placement of retention grooves

Answer 17

.5 mm proximal lock inside the DEJ

Question 18

Proximal lock is more prominent _____ than ____

Answer 18

gingivally than occlusal

Question 19

Convenience form of Class II

Answer 19

Clearance-place walls in a place you can access them

Question 20

Clearance aids in

Answer 20

Allows for easy finishing (less flash)

Question 21

Lesions that deviate from normal (how to treat)

Answer 21

traditional prep and then just extend to affected area only

Question 22

After Class II is done

Answer 22

Clean with air and water, re-evaluate, make any needed complications

Question 23

Most detailed prep

Answer 23

Class II

Question 24

isthmus width of Class II

Answer 24

1/4 of intercuspal distance

Question 25

Gingival floor seat dimension axially

Answer 25

1 -1.5mm

Question 26

Extend towards proximal surface but

Answer 26

DO NOT extend through the affected marginal ridge (to the mesial i.e.)

Question 27

proximal trenching

Answer 27

forms the proximal box

Question 28

makes the proximal box

Answer 28

axial wall, gingival floor/seat, buccal proximal wall, lingual proximal wall

Question 29

Proximal trenching process

Answer 29

sink bur in gingival direction, then move Burr in a B-L direction, break the B and L contacts with the adjacent tooth minimally

Question 30

Clearance with proximals

Answer 30

Remove B and L contacts with adjacent teeth

Question 31

Clearance distance

Answer 31

.5mm or less

Question 32

where is enamel thinner

Answer 32

gingival 1/3

Question 33

enamel plate

Answer 33

enamel preserved to avoid adjacent tooth damage; protective, can be removed once depth is met

Question 34

MArginal ridge on affected side of Class II before dropping burr

Answer 34

.5 mm or so

Question 35

Once done with proximal trenching

Answer 35

clean up proximal box

Question 36

Proximal box gives us

Answer 36

Lingual, gingival, and buccal clearance

Question 37

how to measure gingival clearance

Answer 37

horizontally

Question 38

finish the proximal box with

Answer 38

rotary or hand instrument

Question 39

what to do with enamel/spurs

Answer 39

incorporate a reverse curve, remove them

Question 40

Big deal for Class II amalgam preps

Answer 40

Round the internal line angles