Cavity Design

Question 1

What’s external walls ?

Answer 1

a wall in the prepared tooth that extends to the external tooth surface.

External wall takes the name of the tooth surface toward, which it is situated.

Question 2

What’s internal walls ?

Answer 2

It is a wall in the preparation, which is not extended to the external tooth surface

Question 3

Give 2 internal walls with there definitions ?

Answer 3

1. PULPAL WALL is an internal wall that is toward the pulp and covering the pulp , It may be both vertical and perpendicular to the long axis of the tooth.
2. AXIAL WALL It is an internal wall which is parallel to the long axis of the tooth

Question 4

What’s line angles ?

Answer 4

is a junction of two surfaces of different orientations along the line.
Its name is derived from the involved surfaces.

Question 5

What’s point angle ?

Answer 5

It is a junction of three plane surfaces or three line angles of different orientations. Its name is derived from its involved surfaces or line angles

Question 6

Which classes have same number of line and point angles ?

Answer 6

Class 1, 5
8 lines
4points

Question 7

Another example of same lines and point angles ?

Answer 7

Class 2 , 4
11 lines
8 pointed

Question 8

What’s Internal outline form?

Answer 8

which refers to the shape of internal form of the preparation

Question 9

What’s enameloplasty ?

Answer 9

is removal of sharp and irregular enamel margins of the enamel surface by “rounding” or “saucering” it and converting it into a smooth groove making it a self cleansable area

Question 10

How affected and infected dentin response to stain solutions ?

Answer 10

•infected It can be stained with:
− 0.2% propylene glycol
− 10% acid red solution
− 0.5% basic fuchsin

Affected can’t be stained