This document discusses common anatomical variations that can occur in the maxillary permanent molars. It describes cases of a first molar with 7 cusps and 5 roots, a second molar with an additional cusp (dens evaginatus) that can cause complications, and variations in the number of roots and root canals in the second and third molars that can have up to 5 roots and 6 root canals. It also discusses eruption variations including reversible and irreversible ectopic eruption of the first molar and impacted or inverted third molars. Treatment options addressed include contouring of extra cusps and extracting impacted teeth.

1. By:group 18
Abdelrahman Mohamed 201211
Monia Hatem 201551
Ereny Maged 200807
Ghadeer Reda 204425
Variations in maxillary permanent molars
Underthe supervision of A.Prof Samah Kamel
DrAhmedOsama
DrSara Elbanna

2. Variations of teeth:
Studying Variationsof teeth is asimportant as studying Anatomy of teeth.
Typesof Variations:
◦ Anatomical variation.
◦ Roots variation.
◦ Root canalsvariation.
◦ Eruption variation.

3. MaxillaryFirst
permanentmolar
Variationsin

4. Anatomicaland Roots Variations:
oCase: Thetoothhad7 cusps,5 roots,2 buccal,2palatal,and1 middle
root.Eachroothadone canalexcept inthe middle rootwhichhad2
canals.

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.

7. Maxillarysecond
permanentmolar
Variationsin

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.

11. MaxillaryThird
permanentmolar
Variationsin

12. Roots and Rootcanalsvariations:
◦ MaxillaryThird molar having4 or 5 roots. o it may also have 5 or 6 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

15. Thankyour forlistening.

16. ◦ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6933959/
◦ https://meridian.allenpress.com/angle-orthodontist/article/75/4/610/58191/Ectopic-Eruption-of-the-
Maxillary-First-Permanent
◦ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6103547/
◦ https://medcraveonline.com/JDHODT/ectopic-eruption-of-the-maxillary-first-permanent-molar-a-review-
and-case-report.html
◦ https://www.researchgate.net/publication/46579284_Dens_Evaginatus_on_Occlusal_Surface_of_Maxillary
_Second_Molar_A_Case_Report
◦ https://pubmed.ncbi.nlm.nih.gov/20877163/
◦ http://www.saudiendodj.com/article.asp?issn=1658-
5984;year=2017;volume=7;issue=2;spage=128;epage=131;aulast=Alaajam
◦ http://www.jdas.in/article.asp?issn=2277-
4696;year=2016;volume=5;issue=1;spage=43;epage=45;aulast=Arunkumar
◦ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5683840/
Referances: