5. Eruption Variation:
Reasons of the abnormal eruption:
o Abnormal eruption angle of the first permanent molar.
o Unfavorable second primary molar crown morphology.
If it received no treatment it may cause:
o Space loss for the erupting permanent premolar.
o Malocclusion.
o Decreased arch length.
6. Types of ectopiceruption:
◦ Reversible ectopic eruption—the permanent molar spontaneously self-corrects its
eruption.
◦ Irreversible ectopic eruption—the permanent molar remains blocked againstthe upper
E.
8. AnatomicalVariation:
◦ Presence of one ormore tubercle ofCarabelli on upper7 separated by deep grooves.
Note:Treatmentis donebycontouringofthe tooth.
9. AnatomicalVariation:
◦ Dens evaginatus (i.e. Presence of an accessory cusp on the Occlusalsurface)
◦ Complications: pulpitis, pulp necrosis, periapical peridontitis.
10. Roots and Rootcanalsvariations:
◦ MaxillarySecond molar having 4 roots, 2
palataland 2buccal.
o And in this case it may also have
5 root canals.
13. Eruption Variation:
◦ Impacted teeth is a term used to describe when a tooth doesn't come in or only emerges
partially due to multifactorial causes .
◦ Inversion: Malposition of tooth in which the tooth hasreversed and it's positioned upside
down.
14. Eruption Variation:
o Case: Impacted and inverted maxillary third molar adjacent to carious second molar on OPG.
o Which was treated by Transalveolar extraction of 18 and root canal treatment in 17