OMS Classifications

Question 1

List the most used

1. Anatomical classifications
2. Difficulty of extraction indicies &
3. Treatment protocols

for 3rd molars

Answer 1

1. Winters - 1926, Pell and Gregory - 1933 & Archers - 1975
2. Pedersons index, WHARFE, Winter’s Lines, Marciana
3. Dodson’s Management Protocol (2012)

Question 2

Describe the Pell & Gregory anatomical 3rd molar classification

Answer 2

Question 3

Describe your choice for a difficulty index for 3rd molar extraction and why you use it?

Answer 3

Pederson’s Difficulty Index

I find it marries up well with how difficult I find extractions, I like how it mirrors the pell and gregory anatomical classification of 3rd molars. Simple.

Question 4

Describe a management protocol for the extraction of 3rd Molars?

Answer 4

Dodson’s Management protocol (2012)

Question 5

Describe the anatomical classification you would use for the impacted canine and what the likelihood of spontaneous eruption would be for the classificaiton?

Answer 5

Warfard (2003)

95% will erupt spontaneously in class I

60% in class II

17% in class III

0% in class IV

Question 6

Classify the eruption disturbances.

Answer 6

Primary retention - cessation of eruption before emergence & no impaction

Secondary retention - cessation of eruption after emergency & no impaction

Impaction - The result of a physical barrier in the path of eruption

Question 7

How do you classify supernumerary teeth?

Answer 7

1. Number

• Single
• Multiple

2. Morphology

• Conical
• Tuberculate
• Supplemental
• Odontomas

3. Syndromic

• Syndromic
• Non-syndromic

Question 8

Describe a protocol for the management of the impacted 1st and/or 2nd molar.

Answer 8

Raghoebar (1991)

Question 9

Completed Dento alveolar - next is preprosthetics & implantology