35. Classification of cavities. Principles of cavity preparation by Black.

Question 1

I. Classification of cavities
a/ What is Black classification based on?

Answer 1

On predilection spots of caries on the anatomical crown (unit the cement-enamel junction)

Question 2

I. Classification of cavities
b/ How many classes does the classification have?

Answer 2

1. Class I - V (original)

Later added classes…
2. Class VI: not predilection area (e.g, top of the cusp)
3. Root surface caries: not on the anatomical crown

Question 3

I. Classification of cavities
c/ What does class I have?

Answer 3

Class I - pits and fissures cavities

Question 4

I. Classification of cavities
d/ What does class II have?

Answer 4

Class II - Cavities on the proximal surface of posterior (premolar and molar) teeth (MO, OD, MOD)

Question 5

I. Classification of cavities
e/ What does class III have?

Answer 5

Class III - Cavities on the proximal surface of anterior teeth, incisal edge is intact

Question 6

I. Classification of cavities
f/ What does class IV have?

Answer 6

Class IV - Cavities on the proximal surfaces of anterior teeth that involves the incisal edge

Question 7

I. Classification of cavities
g/ What does class V have?

Answer 7

Cavities on the gingival third of the anatomical crown (bucal/oral)→ smooth surface caries

Question 8

I. Classification of cavities
h/ What does class VI have?

Answer 8

Class VI - Cavities on the incisal edge of anterior teeth, or on the occlusal cusp of posterior teeth→not predilection spot

Question 9

I. Classification of cavities
I/ What are the root surface caries

Answer 9

Caries develops on the root surface (cementum; clinical crown)

Question 10

II. What are Black principles of cavity preparation?

Answer 10

◦Aim: to prevent secunder caries
◦The border of cavity should be extended to areas that aare normally self-cleaning, or cleasable
=> therefore, healthy tooth structure can be removed