Permanent maxillary first molar

Dr. Manjula Marandi, MDS Oral Pathology, Microbiology and Forensic Odontology.

1. Presented by,
Dr. manjula marandi,
MDS Oral Pathology, Microbiology
and Forensic Odontology
The Permanent Maxillary First
Molar

2. Introduction
First permanent molar is present at the
centerof the fully developed adult jaw
anteroposteriorly-corner stone of the dental
arch.
First permanent molar (mand & max) erupts
posterior to the second decidous molar, in
contact with it-so permanent molar is not a
succedaneous tooth, has no predecessor.

3. The Permanent Maxillary First Molar
Largest and strongestmaxillary teeth-bulk
and anchorage in the jaws
Themaxillary first molaris
thetoothlocated laterally (away from the
midline of theface) from both themaxillary
second premolarsof themouthbut mesial
(toward the midline of the face) from
bothmaxillary second molars.
The function of thismolaris similar to that of
all molars in regard to grinding being the
principal action duringmastication,
commonly known as chewing.

4. Chronology
CHRONOLOGY
Notation –
Universal : right -3 ; left-14
International (FDI):right -16; left-26
Palmer:right/left
66

5. Maxillary first molar
Crown –wider buccoligually (1mm) than
mesiodistally.
Four well developed functional cusp and one
supplemental cusp.
Supplemental cusp-cusp or tubercle of Carabelli,
Found lingual to the mesiolingual cusp.
Three roots-well separated and well developed
Lingual root-longest, tapered and smoothly
rounded.
Mesiobuccal root-broader buccolingually
Distobuccal root –smallest of the three, smoothly
rounded

6. Detailed
Description
DESCRIPTION

7. The Buccal Aspect
Trapezoidalshape
Cervical line is the shorter of the uneven
sides
Parts of all 4 cusps visible
Portion of distal surface can be seen
because of the obtuse distobuccalline
angle
Mesiobuccal cusp broderof the buccal
cusps
Prominent buccal groove that
continues over from the occlusalsurface
and terminates half distance to the
cervical line.
Cervical line does not have much
curvature from measialto distal
Proximal contact areas in middle third
P
BD

8. Buccal Aspect
Root trunk–commom root
trunk.
Deep developmental
groove buccally on the root
trunk-starts at the
bifercation & progress
downward becomes
shallower until it terminates
in the shallow depression
at the cervical line.
Lingual root is the longest
& two buccal roots are
equal in length
The roots are about twice

9. Buccal Aspect
BUCCAL ASPECT

10. Palatal Aspect
Outlines reversed from the
buccal aspect, still
trapezoidal.
Lingual cusps are only see
from the lingual aspect.
Mesiopalatallargest cusp
Distopalatal smallestcusp,
almost spheroidal
Lingual developmental
groove –starts approx at the
center of the lingual surface
mesiodistally, curves distally
as it crosses b/w the cusp and
continue to the occlusal

11. Palatal Aspect
•There may be a cusp on the
palatalsurfaceofthe mesiopalatal
cusp.
This is a fifth cusp called the cusp of
Carabelli,which is visible in addition to
the four cusps on the occlusalsurface
All three roots are visible lingual root
making up most of the foreground
Lingual root-conical, terminating in a
bluntly rounded apex

12. PALATAL ASPECT
Palatal Aspect
Cusp of
Carabelli

13. Mesial Aspect
Mesiobuccal and
mesiopalatal and fifthcusps
visible.
Mesiobuccal root hides the
distobuccal
root
Mesiolingual cusp is on a line
with the long axis of the lingual
root
Mesial marginal ridge
confluent with the mesiobuccal,
mesiopalatal cusp ridges is
irregular and curved cervically

14. Mesial Aspect
Cervical line irregularand
curves occlusally
The contact area at the
junction of the middle and
occlusalthird, closer to
the buccalaspect Shallow
concavity just below the
contact area.
Level of bifurcationis a
little closer to the cervical
line than in the roots
buccaly.
Lingual root is longer
L
M

15. MESIAL ASPECT
Mesial Aspect

16. Distal Aspect
Basic outlines reverse from
mesial aspect
Distobuccal and
distopalatal cusps are seen
Marginal ridge dips sharply
cervically
More of occlusal surface
seen because of distal tilt of
crown.
Cervical line almost
straight

17. Distal Aspect
Distobuccal root is narrower
at its base than either of the
others
The buccal outline of the
distobuccal root lies entirely
within the confines of the
outline of the mesiobuccal
root.
Birfurcation is more apical
than either of the two areas
on the tooth
Area from cervical line to
birfurcation is 5mm or more
5mm

18. DISTAL ASPECT
Distal Aspect

19. Occlusal Aspect
Crown-rhomboid, acute angles
mesiobuccaland distolingual,
obtuse angle mesiolingualand
distobuccal
Wider mesiallythan distally and
wider linguallythan buccally
Four major cusp and a fifth
minor, small cusp on lingual
surface of the mesiolingualcusp
Mesiolingualcusp-largestin size
followed by
mesiobuccal,distolingual,
distobuccaland fifth cusp
Maxillary molar primary cusp
triangle-cusp outline,mesial
marginal ridge and oblique ridge
OCCLUSAL
ASPECT
B
P
D

20. Cusp size:
-Mesiopalatal: largest
-Mesiobuccal
-Distobuccal
-Distopalatal: smallest
Ridges:
-Mesialand distal marginal ridges and
oblique ridge
Fossae:
-Major: Central and Distal fossa
-Minor:Mesialand distal triangular
Grooves:
-Central, buccaland palatal
developmental groove
-Distal oblique groove
-Transverse groove
-Fifth cusp groove
-Supplemental grooves
Pit:
-Central Pit

21. OCCLUSAL
ASPECT
Occlusal Aspect

22. The Root
Maxillary first molar has three roots; 2
buccal , 1 Palatal
Palatal root is long and slender
Mesiobuccal root broader, curves distally.
Distobuccal root narrowat base and a lot
straighter
Buccal roots are of equal size, smaller
than the palatal root
Level of bifurcation closer to the cervical
line mesially than distally

23. Differentiation Between Right And
Left Maxillary First Molars
MAXILARY FIRST
MOLAR
RIGHTLEFT

24. Questions?
Describe the occlusal aspect of permanent
maxillary first molar with diagram?
Write a short note on roots of permanent
maxillary first molar with diagram?
Describe in detail characteristic features of
permanent maxillary first molar with diagram?