extraction of first permanent molars in children

Question 1

When does the FPM erupt?

Answer 1

6-7

Question 2

What does hard tissue development of FMP begin?

Answer 2

Around birth

Question 3

When does the FPM begin to form?

Answer 3

17 weeks of gestation

Question 4

What is a balancing extraction?

Answer 4

Removal of a tooth from the opposite side of the same dental arch

Question 5

What is a compensating extraction?

Answer 5

The removal of a tooth from the opposite quadrant

Question 6

When should compensating extractions be carried out for FPM?

Answer 6

Not routinely unless there is a clear occlusal requirement or likelihood of the upper FPM being unopposed for a significant period of time

Question 7

When should balancing extractions be carried out for FPMs?

Answer 7

Not recommended to preserve a dental centreline unless part of a comprehensive orthodontic tx plan

Question 8

At what stage is FPM XLA ideal?

Answer 8

Mineralisation of bifurcation of SPM was previously used
Now look at angulation of SPM and presence of TPM

Question 9

When is FPM XLAs in the upper arch ideal?

Answer 9

Unerupted SPM will generally achieve a good occlusal position - expected to drift mesially
If crowding or class II incisors, considering temporising FPM until SPM erupts allowing placement of a palatal arch on the SPM to prevent their mesial movement

Question 10

When is root formation of the FPM complete?

Answer 10

9-10