7. Cavity Classification

Question 1

Who is responsible for the system of classifying lesions and preparations?

Answer 1

Dr. G.V. Black

Question 2

Class I

Answer 2

all pit and fissure preparations

Question 3

Class II

Answer 3

proximal surfaces of posterior teeth

Question 4

Class III

Answer 4

proximal surfaces of anterior teeth NOT including the incisal edge

Question 5

Class IV

Answer 5

proximal surfaces of anterior teeth including the incisal edge

Question 6

Class V

Answer 6

gingival third of facial or lingual surfaces

Question 7

Class VI

Answer 7

incisal edges of anterior teeth or occlusal tips of posterior teeth

Question 8

all pit preparations

Answer 8

Class I

Question 9

all fissure preparations

Answer 9

Class I

Question 10

proximal surfaces of posterior teeth

Answer 10

Class II

Question 11

proximal surfaces of anterior teeth NOT including the incisal edge

Answer 11

Class III

Question 12

proximal surfaces of anterior teeth including the incisal edge

Answer 12

Class IV

Question 13

gingival third of facial or lingual surfaces

Answer 13

Class V

Question 14

incisal edges of anterior teeth or occlusal cusp tips of posterior teeth

Answer 14

Class VI

Question 15

Class V - abfraction

Answer 15

cervical, wedge-shaped defects due to incorrect forces on the teeth (grinding/bruxism, malocclusion, aggressive brushing)

Question 16

Class V - abrasion

Answer 16

abnormal tooth surface loss due to direct forces of friction between teeth and external objects (improper brushing, mechanical wear [ex. toothpicks], tobacco chewing)

Question 17

Class V - erosion

Answer 17

loss of tooth surface by chemico-mechanical action, ex. stomach acid, acidic beverages or foods

Question 18

retention form / primary retention form

Answer 18

the features of a tooth prep that keeps the crown from being dislodged (undercuts, grooves, slots, pins)

Question 19

secondary retention form

Answer 19

1. additional prep features (grooves, pins) or 2. treatment of the prep walls (adhesion)

Question 20

3 types of minimally invasive preparation techniques:

Answer 20

rotating instruments

oscillating instruments

particle abrasion

Question 21

rotating instruments: when to use high-speed/carbide burs

Answer 21

hard/highly calcified tissues (ex. enamel)

Question 22

rotating instruments: when to use slow-speed carbide burs

Answer 22

softer/less calcified tissues (ex. carious dentin)

Question 23

high-speed handpiece gear ratio

Answer 23

1:5

Question 24

low-speed handpiece gear ratio

Answer 24

1:1

Question 25

Occlusal (O) prep

Answer 25

Class I

Question 26

Mesio-occlusal prep (MO)

Answer 26

Class II

Question 27

Mesio-occlusal-distal prep (MOD)

Answer 27

Class II

Question 28

mesio-lingual prep (ML)

Answer 28

Class III

Question 29

Mesio-lingual-incisal prep (MLI)

Answer 29

Class IV

Question 30

Answer 30

Class I

Question 31

Answer 31

Class II

Question 32

Answer 32

Class II

Question 33

Answer 33

Class III

Question 34

Answer 34

Class III

Question 35

Answer 35

Class IV

Question 36

Answer 36

Class V

Question 37

Answer 37

Class V - abfraction

Question 38

Answer 38

Class V - abrasion

Question 39

Answer 39

Class V - erosion

Question 40

Answer 40

Class VI