Molars

Question 1

Maxillary First Molar
Buccal root trunk length

Answer 1

4mm

Question 2

Maxillary First Molar
Mesial Root Trunk

Answer 2

3mm

Question 3

Maxillary First Molar
Distal Root Trunk

Answer 3

5mm

Question 4

What is the root trunk?

Answer 4

Length from CEJ to furcation

Question 5

What is the largest tooth in maxillary arch?

Answer 5

Maxillary First Molar

Question 6

Maxillary first molar root is ______?

Answer 6

Trifurcated

Question 7

Maxillary first molar diverges toward _____ arch and is the only exception.

Answer 7

Lingual arch

Question 8

BUCCAL view of maxillary first molar

Answer 8

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

Question 9

All maxillary molars are _____?

Answer 9

Trifurcated

Question 10

Which way do the roots get closer together and become shorter?

Answer 10

Mandibular first to the third

Question 11

Third molar roots are often ____?

Answer 11

Fused

Question 12

Maxillary and mandibular first molars have __ cusps?

Answer 12

5

Question 13

Maxillary and mandibular second molars have _ cusps?

Answer 13

4

Question 14

Mandibular third molar has __ cusps?

Answer 14

4

Question 15

Maxillary third molars have __ cusps?

Answer 15

3

Question 16

Maxillary First Molar
LINGUAL VIEW

Answer 16

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

Question 17

Maxillary First Molar
MESIAL VIEW

Answer 17

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

Question 18

Maxillary first molar cusp size
Greater to smallest

Answer 18

ML, MB, DB, DL, caribelli
Counterclockwise

Question 19

Maxillary First Molar
DISTAL VIEW

Answer 19

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

Question 20

Maxillary First Molar
OCCLUSAL VIEW

Answer 20

Most complex table

Bulky M

Triangular ridges of DB and ML form oblique ridge

Developmental grooves

Primary cusp triangle
MB, ML, DB

Question 21

Maxillary First Molar
CROSS SECTION

Answer 21

Wider buccallingually than mesiodistally
One orifice for L, MB, DB
2 orifice for MB (2 root canals)

Question 22

Maxillary Second Molar
BUCCAL VIEW

Answer 22

MB cusp longer than DB

Roots are more parallel, closer together
DB, L, MB

4 cusps seen

Question 23

Maxillary Second Molar
LINGUAL VIEW

Answer 23

L root simple, no grooves, no depressions not as wide as first

ML wider and taller

Lingual developmental groove

Question 24

Maxillary Second Molar
MESIAL VIEW

Answer 24

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

Question 25

Maxillary Second Molar DISTAL VIEW

Answer 25

Occlusal table more visible Short crown and root trunk than Mesial view 3 roots visible L, MB, DB All cusps visible NO Concavity

Question 26

Maxillary Second Molar OCCLUSAL VIEW

Answer 26

Heart shape when missing DL cusp Less complex vs 1st ML LARGEST cusp Primary triangle Crown converged dramatically to lingual

Question 27

Maxillary Second Molar CROSS SECTION

Answer 27

WIDER BUCCALINGUALLY THAN MESIODISTALLY one orifice, one root canal

Question 28

Maxillary Third Molar

Answer 28

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

Question 29

Mandibular First Molar BUCCAL VIEW

Answer 29

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)

Question 30

Mandibular First Molar is largest tooth in the ___?

Answer 30

Jaw

Question 31

The molars are less divergent as they go down

Question 32

Mandibular First Molar LINGUAL VIEW

Answer 32

Can’t see buccal cusps Only ML (taller and sharper) and DL Lingual developmental groove separates cusps 4mm root trunk

Question 33

Mandibular First Molar MESIAL VIEW

Answer 33

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

Question 34

Mandibular First Molar OCCLUSAL VIEW

Answer 34

Pentagon Y GROOVE SHAPE central, MB, DB, L TRIANGULAR FOSSA, pit on each Buccal and lingual surfaces visible Converge lingual

Question 35

Mandibular First Molar CROSS SECTION

Answer 35

Wider MD than BL One orifice D root M root (2 root canals)

Question 36

Mandibular Second Molar BUCCAL VIEW

Answer 36

4 cusps Taller lingually (lingual cusps seen) 1 B developmental groove No pit Buccal groove in line with furcation

Question 37

Mandibular Second Molar LINGUAL VIEW

Answer 37

Lingual developmental groove Cusps shadow and taller

Question 38

Mandibular Second Molar MESIAL VIEW

Answer 38

Rhomboidal Mesial cusps taller than distal M root wider and longer than distal

Question 39

Mandibular Second Molar DISTAL VIEW

Answer 39

Mesial root visible Distal cusps farther apart than buccal Root is conical and tapers evenly, simple

Question 40

Mandibular Second Molar OCCLUSAL VIEW

Answer 40

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

Question 41

Mandibular Second Molar CROSS SECTION

Answer 41

Wider MD than BL One orifice D root M root Usually one root canal