Molars Flashcards
Maxillary First Molar
Buccal root trunk length
4mm
Maxillary First Molar
Mesial Root Trunk
3mm
Maxillary First Molar
Distal Root Trunk
5mm
What is the root trunk?
Length from CEJ to furcation
What is the largest tooth in maxillary arch?
Maxillary First Molar
Maxillary first molar root is ______?
Trifurcated
Maxillary first molar diverges toward _____ arch and is the only exception.
Lingual arch
BUCCAL view of maxillary first molar
2 roots buccal—MB root and DB root looks like a plier handle
1 root seen lingually
2 cusps- MB cusp wider than DB
CERVICAL RIDGE
Buccal developmental groove in line with furcation comes to a PIT on side of crown
DB cusp sharper
LONGEST OCCLUSO-CERVICAL (From bottom to top of crown)
Trapezoidal outline
All maxillary molars are _____?
Trifurcated
Which way do the roots get closer together and become shorter?
Mandibular first to the third
Third molar roots are often ____?
Fused
Maxillary and mandibular first molars have __ cusps?
5
Maxillary and mandibular second molars have _ cusps?
4
Mandibular third molar has __ cusps?
4
Maxillary third molars have __ cusps?
3
Maxillary First Molar
LINGUAL VIEW
3 cusps visible— CofC, ML, DL (exception bc of cusp of carabelli
Lingual developmental groove
CROWN WIDER MESIODISTALLY ON LINGUAL than buccal bc of CofC
Lingual root, tall and wide with blunt apex
Maxillary First Molar
MESIAL VIEW
Larger than distal surface
L root-widely DIVERGED
MB root-wide bc of 2 root canals, root depression
3mm root trunk
ML cusp centered on root trunk
Contact: jxn of occlusal third and middle third
Maxillary first molar cusp size
Greater to smallest
ML, MB, DB, DL, caribelli
Counterclockwise
Maxillary First Molar
DISTAL VIEW
5mm root trunk
L root, DB root, MB root also visible since it’s so wide
Contact: middle third
DM ridge shorter so occlusal table is visible
Maxillary First Molar
OCCLUSAL VIEW
Most complex table
Bulky M
Triangular ridges of DB and ML form oblique ridge
Developmental grooves
Primary cusp triangle
MB, ML, DB
Maxillary First Molar
CROSS SECTION
Wider buccallingually than mesiodistally
One orifice for L, MB, DB
2 orifice for MB (2 root canals)
Maxillary Second Molar
BUCCAL VIEW
MB cusp longer than DB
Roots are more parallel, closer together
DB, L, MB
4 cusps seen
Maxillary Second Molar
LINGUAL VIEW
L root simple, no grooves, no depressions not as wide as first
ML wider and taller
Lingual developmental groove
Maxillary Second Molar
MESIAL VIEW
2 cusps
MB, ML
2 roots
MB, L
CEJ straight line
Roots close together do not diverge within crown
MMR perpendicular to long axis of tooth
Contact: middle third
Maxillary Second Molar
DISTAL VIEW
Occlusal table more visible
Short crown and root trunk than Mesial view
3 roots visible
L, MB, DB
All cusps visible
NO Concavity
Maxillary Second Molar
OCCLUSAL VIEW
Heart shape when missing DL cusp
Less complex vs 1st
ML LARGEST cusp
Primary triangle
Crown converged dramatically to lingual
Maxillary Second Molar
CROSS SECTION
WIDER BUCCALINGUALLY THAN MESIODISTALLY
one orifice, one root canal
Maxillary Third Molar
BUCCAL-3 cusps
Small round short
Compound root (fused)
LINGUAL-curves distally toward roots
MESIAL-CEJ is irregular, root splits at tip
DISTAL-DM ridge is short
OCCLUSAL-Heart shape, wrinkled, converge lingual distally
CROSS SECTION-wide BL than MD, orifice varies
Mandibular First Molar
BUCCAL VIEW
CROWN AND ROOT TAPER TOWARD DISTAL
3mm root trunk
Lingual cusps taller than Buccal
MB groove could possibly end in a pit
DB groove faded gradually
M root longer than D (looks like banana)
Mandibular First Molar is largest tooth in the ___?
Jaw
The molars are less divergent as they go down
Mandibular First Molar
LINGUAL VIEW
Can’t see buccal cusps
Only ML (taller and sharper) and DL
Lingual developmental groove separates cusps
4mm root trunk
Mandibular First Molar
MESIAL VIEW
MB root wider and taller- has 2 root canals
Root concavity bc of 2 root canals
ML cusp taller than MB
Cusp tip within root boundary
Tapers lingually at apical third
MMR 1mm taller than DMR
Mandibular First Molar
OCCLUSAL VIEW
Pentagon
Y GROOVE SHAPE
central, MB, DB, L
TRIANGULAR FOSSA, pit on each
Buccal and lingual surfaces visible
Converge lingual
Mandibular First Molar
CROSS SECTION
Wider MD than BL
One orifice
D root
M root (2 root canals)
Mandibular Second Molar
BUCCAL VIEW
4 cusps
Taller lingually (lingual cusps seen)
1 B developmental groove
No pit
Buccal groove in line with furcation
Mandibular Second Molar
LINGUAL VIEW
Lingual developmental groove
Cusps shadow and taller
Mandibular Second Molar
MESIAL VIEW
Rhomboidal
Mesial cusps taller than distal
M root wider and longer than distal
Mandibular Second Molar
DISTAL VIEW
Mesial root visible
Distal cusps farther apart than buccal
Root is conical and tapers evenly, simple
Mandibular Second Molar
OCCLUSAL VIEW
Rectangular
Cross Section groove
4 even cusps
MB cusp creates bulk for HoC on buccal
3 Fossa similar to first molar
Central-major
Distal and Mesial-minor
3 pits
Mandibular Second Molar
CROSS SECTION
Wider MD than BL
One orifice
D root
M root
Usually one root canal
