10. MAXILLARY 2ND MOLAR
Buccal Aspect
All the outlines are the same as 1st molar
Cusps
Occlusal outline is formed by the MB and DB cusps
MB cusp; is the widest.
DB cusp; is smaller.
11. MAXILLARY 2ND MOLAR
Buccal Aspect
The roots
The three roots are seen from the buccal aspect.
The roots are less diverged, nearly parallel to each other and
distally curved.
A deep developmental groove.
12. MAXILLARY 2ND MOLAR
Palatal Aspect
Lingual convergence
lingual convergence
Cusps
Occlusal outline is formed by the MP and DP cusps
MP cusp; is the largest.
DP cusp; is small, smooth and spheroid
DB cusp can be seen.
Surface description
The lingual development groove.
No Carabilli’s cusp.
The roots
The 3 roots are seen.
the apex of the palatal root is in a line with the lingual
developmental groove
Developmental depression on the root surface
16. MAXILLARY 2ND MOLAR
Occlusal Aspect
Geometric outline
More Rhomboidal
The BP dimension is greater than the MD
dimension.
The crown tapers distally& lingually.
Elevations
The 4 cusps.
Oblique ridge.
Marginal ridges, strong and well developed;
the distal marginal ridge is shorter and at a
lower level.
MP
DB MB
DP
17. MAXILLARY 2ND MOLAR
Occlusal Aspect
Depressions
Developmental grooves.
Supplementary grooves.
Major fossae; central fossa, Distal fossa.
Minor fossae; mesial and distal triangular
fossae.
24. Type I
Single canal
from pulp
chamber to
apex
Type II
Two canals
merge to form
a single canal
short of the
apex
Type III
Two separate
and distinct
canals from
chambers to
apex
Type IV
One canal
divided into
two separate
and distinct
canals
Root canal
31. PULP CAVITY
2ND MOLAR
Canals are not flared or spaced as in 1st molar
Two buccal root canals even if there is fused roots.
One root canal in the mb root but two canals in the mb root
also may be seen
Because the dl cusp is normally reduced in size, the dl pulp
horn is also relatively smaller.
The DB orifice approaches midpoint between mb and
palatal canals.
When the general crown form of this tooth is heart shaped,
cervical cross section is usually roughly triangular
In mid root cross section the MB root is rectangular with
rounded corners. DB and palatal roots are round or oval.