Variation of upper permanent molars

1. Variation of upper permanent molars
Samar Maged ,Rehab Kotb,Youssef Esmat ,Mariam Hany ,Youstina
Abd ElMalak
Semester Two
Under supervision of : A.Prof Samah Kamel

2. ➢More than 300 genes are responsible for
the anatomy of the teeth so any defect
on these genes will lead to a definite
change in the morphology of the tooth.

3. ➢ The Upper First Permanent Molar:
❏ They may have one or two or four or
five roots.
❏ Six or seven root canal or C_shaped
canal configuration.

4. ❏ Normal crown Four cusps
Tubercle of Carabelli.
❏ Abnormal crown five or Three
cusps (Tubercle of Carabelli oblique
ridge) are missed.
➢ Normal Teeth:

5. ❏ A 9-year-old child reported to the
Oral Health Sciences Center.
❏ The central cusp also known as
“Dens Evaginatus”.
➢ The Upper Second Permanent Molar:

6. ➢To be cont.:
❏ Three roots and canals .
❏ Two separate roots .
1 Root, 1 Canal

7. ➢To be cont. :
4 Roots, 4 Canals
7 Roots canals

8. ➢ Concrescence:-
❏ It's a fusion of the cementum of two
teeth or more at root formation , more
frequently noted in maxillary region .
(second and third (impacted)molar)
(0.8%)

9. ❏ A Radiograph showing a fused
upper 8 and 7 in the root portion.

10. ❏ The third molars may have from
1 to 5 roots,
❏ The roots may get fused, it's
very common .

11. From 1 to 6 root canals.
5 root canals
3 root canals

12. Dens invaginatus : extensive
compound odontoma, and dens
in dente, occurs as a
consequence of an invagination
on the external surface of the
tooth crown before calcification
.
Maxillary right third molar with six
cusps and dens evaginatus.

13. ➢ Impacted maxillary third molar :
❏ Third molar exposed to be
impacted .
❏ (1) mesioangular, (2) distoangular, (3)
vertical, (4) horizontal, (5)
buccoangular , (6) linguoangular, (7)
inverted.

14. ➢ Supernumerary teeth :
❏ Are rare with a percentage of occurance between (0.3 -3.8) .
❏ The etiology of supernumerary teeth has not been yet completed classified .
❏ A total of 28.72 cases were reviewed from 87 fourth molars are identified .
❏ Cases are reported with disto molars .

15. ➢ Paramolars :
❏ Position of paramolars .
❏ Shapes of paramolars.
❏ The difficulty in seeing paramolars by
radiographic examination .
❏ The measurements of the paramolars.

16. sources
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3570973/ ( 2013 Jan 20 )
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5072076/ ( 2016 Sep 1 )
https://www.ncbi.nlm.nih.gov/pubmed/25693211 ( 2015 Jan )
https://images.app.goo.gl/uUvdV5TGQBSRXKJe9 ( July-September 2018 )
http://revodonto.bvsalud.org/pdf/rsbo/v12n1/a09v12n1.pdf ( 2015 Jan-Mar )
https://www.colgate.com/en-us/oral-health/basics/mouth-and-teeth-anatomy/what-is-concrescence--
https://www.peertechz.com/Dental-Problems-Solutions/JDPS-4-142.php ( 22 March, 2017 )

17. ➢ To be cont.
https://www.intechopen.com/books/human-teeth-key-skills-and-clinical-illustrations/morphology-of-
root-canal-system-of-maxillary-and-mandibular-molars ( October 23rd 2019 )
https://www.researchgate.net/figure/Archers-classification-of-upper-third-molars-according-to-their-
inclination-to-the-long_fig7_315733169
https://bmcoralhealth.biomedcentral.com/articles/10.1186/s12903-019-0852-z (2019)
http://www.ijohsjournal.org/article.asp?issn=2231-
6027;year=2013;volume=3;issue=2;spage=92;epage=97;aulast=Nagaveni ( 2013 )
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3612233/ ( 2012 Nov-Dec )
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3671819/ (2013 Mar 19 )

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