Classification of Dental Caries

Question 1

Class I

Answer 1

• Caries confined to the occlusal pits and fissures on MOLARS and PREMOLARS
• Caries confined to the buccal and lingual pits of MOLARS
• Caries confined to the lingual pits of ANTERIOR TEETH

Question 2

Class II

Answer 2

-Caries present on the proximal surfaces of POSTERIOR TEETH

Question 3

Class III

Answer 3

Caries on the proximal surface of ANTERIOR teeth that do NOT include the incisal edge

Question 4

Class IV

Answer 4

Caries on the proximal surface of ANTERIOR teeth that include the incisal edge

Question 5

Class V

Answer 5

Caries on the facial and lingual gingival third of any tooth

Question 6

Class IV

Answer 6

Caries on the cusp tips of any tooth

Question 7

define cavosurface angle

Answer 7

angle of tooth structure formed at the margin of the cavity preparation wall and the unprepared tooth surface

Question 8

Define cavosurface margin

Answer 8

line of cavity preparation where the external surface of the tooth meets the restoration margin

Question 9

Etiology of class I caries

Answer 9

Clinically often observed in patients that have:

• deep pits/fissures
• poor OH
• frequent intake of sugar
• unfluoridated communities where access to care is limited

Question 10

Etiology of class V caries

Answer 10

• gingival recession (exposed cementum)
• Erosion, abrasion, abfraction along the gingival third of teeth (exposed dentin)
• Xerostomia (due to medication, radiation, disease, etc)
• Presence of dental appliances
• Poor OH
• Frequent intake of sugar
• Unfluoridated communities with limited access to care

Question 11

What can be used to detect whether a cass I caries lesion has penetrated into dentin?

Answer 11

BW

Question 12

What is required of the teeth during a clinical assessment for class v caries?

Answer 12

clean dry teeth

Question 13

T/F: it is ok to place cavosurface margin on occlusal contact

Answer 13

False! avoid placement of margins on occlusal contact due to risk of fracture

Question 14

pulpal floor must be at least ___mm into dentin

Answer 14

0.25mm

Question 15

Occasionally, class I occlusal preps must extend onto lingual/facial surfaces to include carious pit. What side would it be for Mx and Md molars?

Answer 15

Mx - lingual

Md - buccal

Question 16

Location of transverse ridge in Md 1st premolar

Answer 16

extends from the triangular ridge of the buccal cusp to the triangular ridge of the lingual cusp and separates the mesial and distal fossae

Question 17

If mesial and distal portions of Md 1st PM are carious, what can you do?

Answer 17

create a prep avoiding the transverse ridge

Question 18

3 non-carious class v lesions

Answer 18

1. abrasion
2. Abfraction
3. erosion

Question 19

Early class v lesions appear ____, wehereas advanced class v lesions appear ____

Answer 19

Early class v lesions appear YELLOWISH, wehereas advanced class v lesions appear DARK BROWN/BLACK

Question 20

Etiology of abrasion lesions

Answer 20

-frictional force between tooth and external forces

Question 21

Etiology of abrfaction lesions

Answer 21

• occlusal flexural forces and parafunctional stresses

- occlusal loads cause teeth to flex at the neck

Question 22

appearance of abrfaction lesions

Answer 22

sharp, wedge-shaped notch in the gingival portion

Question 23

What material do you usually use for abrfaction lesions and why?

Answer 23

GI, because it displays chemical adhesion

Question 24

etiology of erosion lesions

Answer 24

exogenous exposure: diet

endogenous exposure: GERD, bulimia

Question 25

presentation of erosion lesions

Answer 25

smooth shiny lesions

Question 26

Management of non carious lesions

Answer 26

• document and monitor
• identify etiology and eliminate if possible
• restore if symptomatic, become carious, or esthetic concerns

Question 27

How to increase retention of class v preps

Answer 27

by placing undercuts on the occlusopulpal and gingivopulpal line angles with L and R margin trimmers