Difference between
right and left teeth Permanent teeth:
Maxillary central
When viewed from the labial aspect,
the distal incisal angle is more rounded than the mesial.
In many specimens, a
cross-section mid-root reveals a right triangle outline with the hypotenuse is
toward the mesial.
Maxillary lateral
The distoincisal angle is more
rounded than the mesial incisal angle.
The tip of the root may incline
distally, but this is not a consistent finding.
Mandibular central
The symmetry of this tooth makes a judgment on right and
left unreliable.
Mandibular lateral
Two significant features assist
in identification, even in a worn tooth.
-The incisal edge is ‘twisted’
relative to a line passing from the labial to the lingual anticipating the
curvature of the dental arch.
-The cingulum will be shifted
toward the side from where the tooth has come.
Maxillary and
mandibular canine
-The distal surface is fuller and
more convex than the mesial surface.
Maxillary first
Two distinctive traits help is distinguishing right and
-The mesial developmental depression and the mesially
displaced lingual cups tips are consistent clues for determining right and
-When well defined, the mesial marginal ridge is also a clue
to right and left          
Maxillary second
The one consistent clue to right
and left is the lingual cusp tip which is shifted mesially.
Mandibular first
-The larger distal occlusal fossa and mesial lingual
marginal developmental groove are consistent clues to right and left.
-The distal surface has a longer radius of curvature than does
the mesial surface.
Mandibular second
In the two cusp version, the
lingual cusp tip is shifted mesially.
In the three cusp version, the
larger of the two lingual cusps is to the mesial.
Maxillary first molar
-The large mesiolingual cusp,
-Single large lingual (palatal) root,
-Carabelli trait makes
distinguishing right and left easy                                                        
Maxillary Second Permanent Molar
-The large mesiolingual cusp
-Small distolingual cusp
-Three roots (larger palatal)
make distinguishing right and left easy.
Mandibular First Permanent Molar
The cervical ridge on the buccal
aspect, the two buccal cusps located to the buccal along with the distal cusp
provide identification of the buccal aspect.
The distal cusp is the smallest
and is displaced along the occlusal aspect. These features make possible
identification of right and left.
Mandibular Second Molar
When viewed occlusally, there is
a distinctive prominence of enamel at the mesiobuccal–a feature shared with
first deciduous molars.
Examined from the mesial or
distal, the lingual surface has its height of curvature midway between the
occlusal and the cervical line.

On the buccal surface, the height
of curvature is at the gingival third–near the cervical line. 


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