1. Variations in Maxillary Molars
Prepared By :
Rawan Osama ,Hania Ashraf, NadaMohamed ,Sandra
Wael
Semester Two
Under supervision of : A.Prof Samah Kamel
3. Variation of the crown
1-
TUBERCLE
OF
CARABELLI
2-
ACCESSORY
CUSP
4. ➢ Usually the maxillary first
molar has 3 roots, 2
buccal and 1 palatal.
➢ There are 6% only who
have four separated roots
EROOTS
5. In very rare cases the maxillary
first molar may be single rooted
and may have 2 roots in other
cases.
Root Canals
In some cases there maybe 2 root
canals in one root.
An abnormal case had 6 root
canals.
7. Rare case
Appearance of parastyle cusp
o An accessory cusp on the
buccal surface of the
mesiobuccal cusp of
maxillary molars.
o Cusp-like pyramidal
projection on the buccal
surface of the mesiobuccal
cusp, which had its base
below the gingival margin
and apex toward the
occlusal surface of the tooth
Anatomical
variation in
the crown :
• Three cusp type with
heart- shaped
occlusal aspect
resembling maxillary
3rd molar.
8. ROOTS: The standard configuration of maxillary second molars has been
described to have three roots and either three or four canals, with
the fourth canal usually being the second mesiobuccal (MB2)
Variations:
• (MB1) rarly has two canals .
• The presence of two palatal roots is
less than 3%.
• The Presence of Fused roots .
• Absence of roots .
11. The wisdom tooth :
Dentists may have some complications
in treatment of 3rd molars due to :
● Difficulty in their access
● Their aberrant occlusal anatomy
● Different patterns of eruption ( 18-21)
The anatomy of 3rd molars has been
described as unpredictable
12. Heart shape type with 3 cusps
Rhomboidal shape type with 4 cusps
One cusp type ( peg shaped )
Congenitally missing
IT MAY HAVE
VARIATIONS
OCCLUSALLY
13. Abnormalities :
• 3 curved roots in different angulation.
• The anatomy of root canal system
recorded , 15 % of maxillary 3rd
molars had 1 root, 32% had 2 roots ,
45% had 3 roots and 7% had 4 roots .
• Missing 3rd molars were more
common in the maxilla on the right
side.
• May be completely erupted or
partially.
14. Our Sources
[1] https://www.ncbi.nlm.nih.gov/m/pubmed/11469300
[2] Anantharaj A, Praveen P, Karthik V, Rani P, Krishnan MB. Bilateral Six Cusped And
three Rooted Mandibular 1st Permanent Molars. World Journal of
Dentistry. 2011;2(3):255–28.
[3] Ling JYK, Wong RWK. Molar Cusps in Southern Chinese. The Open Anthropology
Journal. 2010;3:16–19.
[4] www.ncbi.nlm.nih.gov
[5] Abdulbaset A. Mufadhal, Mohammed A. Aldawla and Ahmed A. Madfa (September 11th
2019). External and Internal Anatomy of Maxillary Permanent First Molars, Human Teeth -
Key Skills and Clinical Illustrations, Zühre Akarslan and Farid Bourzgui, IntechOpen.
