Applegate’s rules

Question 1

Rule 1:

Answer 1

Classification should follow rather than precede extraction that might alter theoriginal classification.

Question 2

Rule 2:

Answer 2

If the third molar is missing and not to be replaced, it is not considered in theclassification

Question 3

Rule 3:

Answer 3

If a third molar is present and is to be used as an abutment, it is considered inthe classification.

Question 4

Rule 4:

Answer 4

If a second molar is missing and is not to be replaced, it is not considered inthe classification

Question 5

Rule 5:

Answer 5

The most posterior edentulous area or areas always determine theclassification

Question 6

Rule 6:

Answer 6

Edentulous areas other than those determining the classification are referred toas modification spaces and are designated by their number

Question 7

Rule 7:

Answer 7

The extent of the modification is not considered, only the number of additionaledentulous areas

Question 8

Rule 8:

Answer 8

There can be no modification areas in class IV arches. Any edentulous arealying posterior to the single bilateral area determines the classification.