Variation of mandibular molars

1. WELCOME
Variations in Mandibular
Permanent Molars
PREPARED BY:
Yasmin Ashraf, Marwa Mohamed ,Rola Khaled,
Sama Samir
Under Supervision: A.Prof. Samah Kamel
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on
Lower6
Lower7
Lower8
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The anomalies of the teeth have always been of great
interest to the dentist from the scientific as well as from
the practical view point. Most anomalies occur in the
permanent than in the primary dentition and in the maxilla
than in the mandible.
6 7
8

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Mandibular first
permanent
molarVariations in Crown
and Roots
Mandibular
Second
permanent
molar
Taurdontism
Hypodontia
Mandibular
third permanent
molarVariations in the Crown
and root
Impaction
01 02 03

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32
Abnormal
1
with 4 cusps
*
with 6 cusps with 7cusps
Abnormal Abnormal
Variations in Crown
*Treatment

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The causes of this abnormalities are:
some mutations in the genes encode
transcription factors and signaling
molecules which are involved in
odontogenesis.
Example: MSX-1

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Lower6
Lower7
Lower8
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Lower6
Normal
with 2
roots
1
Radix
entomolari
s
2
With 1 root
Causes and effects of abnormal Cases
Abnormal Abnormal
Variations in the Roots

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Lower7
01
02
03
Taroudant tooth may have an abnormal root canal
system.

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Lower7
A delay in calcification of
the pulp chamber floor
An unusual
developmental pattern
01
02
Causes of Taurdontism

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Lower7
Main points dentists should avoid during the
treatment of this tooth:
• In performing pediatric endodontics on these teeth, one should
appreciate complexity of root canal system.
• Careful exploration of the grooves between all orifices,
particularly with magnification, ultrasonic irrigation and a
modified filling technique are recommended.

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Lower6
Lower7
Lower8
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Hypodontia is a common dental abnormality in the
population which may appear as a part of syndromic
or nonsyndromic form
Patients may suffer from :
• unfavorable appearance
• malocclusion
• periodontal damage
• other problems.
Caused by :
a number of interactions between genetic and
environmental factors during dental development.

11. Introducti
Lower6
Lower7
Lower8
TheEnd Normal
with
lower7
with lower
7
1
Missing 7 &
germs of 8
2
Missing many
permanent
teeth
Diagnosis.
By using intraoral ( radiographic )
Abnormal Abnormal

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From the variations that may
appear in the crown of the
lower third molar:
The presence of an extra cusp
and a premolar-shaped protostylid
The presence of 4 cusps with a
prominent oblique ridge kind of
structure extending from the mesio-
lingual to the disto-buccal cusp
01
02

13. Introducti
Lower6
Lower7
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TheEnd From the variations that may appear in the root of
the lower third molar:
The fusion of the
roots
01
02
03
The severe curvature of the roots
The presence of a single root
The presence of three roots, two on the
lingual aspect and one on the buccal aspect04

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TheEnd Impaction of the mandibular third molar:
The Definition
The Cause
The Treatment

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Thank You 
http://www.ijcem.com/files/ijcem0024485.pdf
http://revodonto.bvsalud.org/pdf/rsbo/v12n1/a09v12n1.pdf
http://scielo.isciii.es/scielo.php?script=sci_arttext&pid=S1698-
69462007000800014
https://www.hindawi.com/journals/crim/2015/827070/
https://www.hxbenefit.com/taurodontism.html
http://www.jiaomr.in/article.asp?issn=09721363;year=2016;volume=28;iss
ue=1;spage=57;epage=60;aulast=Desai
https://www.researchgate.net/publication/306241378_Gemination_of_a_ma
ndibular_third_molar_A_rare_case_report
• http://www.ejgd.org/article.asp?issn=2278
9626;year=2012;volume=1;issue=3;spage=148;epage=160;aulast=
• https://www.heighpubs.org/johcs/johcs-aid1010.php
• https://www.researchgate.net/figure/Control-panoramic-radiograph-
during-lower-left-third-molar-surgery-shows-a-fracture-
of_fig1_248386460
• https://www.ncbi.nlm.nih.gov/pubmed/9680909
References