Permanent 2 Maxillary Molars - KSUfac.ksu.edu.sa/.../rds_110_2nd3rd_maxillary_molars... · Max....
Transcript of Permanent 2 Maxillary Molars - KSUfac.ksu.edu.sa/.../rds_110_2nd3rd_maxillary_molars... · Max....
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Permanent 2nd Maxillary Molars
In comparison to the first max molar
Rana S. AlHamdan
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First molars appears in
the oral cavity at the age
of 6 years old..
While
2nd molar……
3rd molar……
Rana S. AlHamdan
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Max. 2nd molar have long roots
(sometimes longer than the first molar !)
2nd molar1st molar
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Max. right 1st molar Max. right 2nd molar
DB is smaller
DL is smaller
No fifth cusp
MBDB
MLDL
MBDB
MLDL
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2 types of 2nd max. molar
Similar to the 1st molar
rhomboidal, although
lesser measurement
lingually
Similar to the 3rd molar.
DL cusp is poorly
developed..
Result in heart-shaped
form occlusally
rhomboidal heart-shaped
Rana S. AlHamdan
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Buccal aspect
Rana S. AlHamdan
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Crown cervico-occlusally is 0.5 mm or so shorter than the first molar..
2nd molar1st molar
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DB cusp is smaller
2nd molar1st molar
MD MDDB DB
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DB cusp is smaller and allows part of the
distal marginal ridge and part of the DL
cusp to be seen
2nd molar1st molar
MD MDDB
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Buccal roots about the same
length, nearly parallel
Rana S. AlHamdan
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Buccal roots inclined distally more than those of max. 1st molar
2nd molar1st molar
MD MD
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Apex of MB root is on a line with buccal groove of the crown instead of the tip of the MB cusp, as found on the first molar.
2nd molar1st molar
MD MD
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Lingual aspect.
Maxillary LEFT 2nd molar
Rana S. AlHamdan
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DL cusp is smaller than 1st max. molar.
2nd molar1st molar
Rana S. AlHamdan
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No fifth cusp is evident
Rana S. AlHamdan
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Apex of the lingual root is in line with DL cusp tip instead of the lingual groove as was found on 1st max molar
2nd molar1st molar
Rana S. AlHamdan
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Mesial aspect.
Maxillary LEFT 2nd molar
Rana S. AlHamdan
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BL dimensions similar to 1st molar, but
crown length is less
2nd molar1st molar
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Roots close to each other, within the BL
crown outline
2nd molar1st molar
Rana S. AlHamdan
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Distal aspect.
Maxillary LEFT 2nd molar
Rana S. AlHamdan
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DB cusp is smaller than 1st molar, that’s why
more of the MB cusp may be seen from this
angle
2nd molar1st molar
Rana S. AlHamdan
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Apex of the L root is in line with the DL cusp
Distal view of 2nd molar
L
Rana S. AlHamdan
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Rhomboidal type of second maxillary molar is most common, although in
comparison to with 1st molar, acute angles of the rhomboid are less and
the obtuse angles greater
Rana S. AlHamdan
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B-L diameter of the crown is about equal,
Rana S. AlHamdan
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B-L diameter of the crown is about equal,
but M-D diameter is about 1 mm less
Rana S. AlHamdan
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DB and DL cusps are smaller than 1st molar
Rana S. AlHamdan
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More supplemental grooves and pits
Rana S. AlHamdan
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Permanent 3rd Maxillary Molars
Rana S. AlHamdan
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Generally, 3rd molars crowns are
smaller and roots are shorter with
inclination toward fusion.
Rana S. AlHamdan
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BuccAL Aspect
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Crown shorter cervico-occlusally than the 2nd molar..
2nd molar1st molar 3rd molar
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narrower M-D than the 2nd molar
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2nd molar1st molar 3rd molar
Roots are usually shorter and fused
Roots inclined distally
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Lingual aspect.
Maxillary RIGHT 3rd molar
Rana S. AlHamdan
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Only one large lingual cups is present,
so no lingual groove (Exceptionally, DL cusp present with the lingual groove)
DLM D
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M D
Taper of the fused root
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Main feature is the taper to fused roots or a
bifurcation, usually in the apical third of the
root
Mesial aspect.
Maxillary RIGHT 3rd molarRana S. AlHamdan
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Distal aspect.
Maxillary RIGHT 3rd molarRana S. AlHamdan
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There is tendency of the crown to taper
distally..
Most of the buccal aspect of the crown is in
view
L B
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Measurement from cervical line to marginal ridge is short
L B
Rana S. AlHamdan
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More of the occlusal surafce may be seen than can be seen on the second molar from this aspect..
L BL B
2nd molar 3rd molar
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Occlusal aspect.
Maxillary RIGHT 3rd molarRana S. AlHamdan
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Heart-shaped ♥
Three functional cusps,
2 Buccal
1 lingual
Rana S. AlHamdan
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DL cusp is very small, and may be absent,
which gives a semicircular outline to the
tooth from one contact area to the other
L
B
D M
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Many supplemental grooves
L
B
D M
Rana S. AlHamdan
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3rd molars (maxillary & mandibular ) shows
variations more than any other teeth in the
mouth..
Rana S. AlHamdan
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3rd max. molars Ten typical samples
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Extreme Variations !!!
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Rana S. AlHamdan