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DH121 Oral Biology > Molars > Flashcards

Molars Flashcards

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1
Q

Maxillary First Molar
Buccal root trunk length

A

4mm

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2
Q

Maxillary First Molar
Mesial Root Trunk

A

3mm

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3
Q

Maxillary First Molar
Distal Root Trunk

A

5mm

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4
Q

What is the root trunk?

A

Length from CEJ to furcation

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5
Q

What is the largest tooth in maxillary arch?

A

Maxillary First Molar

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6
Q

Maxillary first molar root is ______?

A

Trifurcated

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7
Q

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

A

Lingual arch

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8
Q

BUCCAL view of maxillary first molar

A

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

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9
Q

All maxillary molars are _____?

A

Trifurcated

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10
Q

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

A

Mandibular first to the third

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11
Q

Third molar roots are often ____?

A

Fused

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12
Q

Maxillary and mandibular first molars have __ cusps?

A

5

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13
Q

Maxillary and mandibular second molars have _ cusps?

A

4

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14
Q

Mandibular third molar has __ cusps?

A

4

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15
Q

Maxillary third molars have __ cusps?

A

3

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16
Q

Maxillary First Molar
LINGUAL VIEW

A

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

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17
Q

Maxillary First Molar
MESIAL VIEW

A

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

18
Q

Maxillary first molar cusp size
Greater to smallest

A

ML, MB, DB, DL, caribelli
Counterclockwise

19
Q

Maxillary First Molar
DISTAL VIEW

A

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

20
Q

Maxillary First Molar
OCCLUSAL VIEW

A

Most complex table

Bulky M

Triangular ridges of DB and ML form oblique ridge

Developmental grooves

Primary cusp triangle
MB, ML, DB

21
Q

Maxillary First Molar
CROSS SECTION

A

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

22
Q

Maxillary Second Molar
BUCCAL VIEW

A

MB cusp longer than DB

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

4 cusps seen

23
Q

Maxillary Second Molar
LINGUAL VIEW

A

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

ML wider and taller

Lingual developmental groove

24
Q

Maxillary Second Molar
MESIAL VIEW

A

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

25
Q

Maxillary Second Molar
DISTAL VIEW

A

Occlusal table more visible

Short crown and root trunk than Mesial view

3 roots visible
L, MB, DB

All cusps visible

NO Concavity

26
Q

Maxillary Second Molar
OCCLUSAL VIEW

A

Heart shape when missing DL cusp

Less complex vs 1st

ML LARGEST cusp

Primary triangle

Crown converged dramatically to lingual

27
Q

Maxillary Second Molar
CROSS SECTION

A

WIDER BUCCALINGUALLY THAN MESIODISTALLY

one orifice, one root canal

28
Q

Maxillary Third Molar

A

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

29
Q

Mandibular First Molar
BUCCAL VIEW

A

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)

30
Q

Mandibular First Molar is largest tooth in the ___?

A

Jaw

31
Q

The molars are less divergent as they go down

A
32
Q

Mandibular First Molar
LINGUAL VIEW

A

Can’t see buccal cusps

Only ML (taller and sharper) and DL

Lingual developmental groove separates cusps

4mm root trunk

33
Q

Mandibular First Molar
MESIAL VIEW

A

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

34
Q

Mandibular First Molar
OCCLUSAL VIEW

A

Pentagon

Y GROOVE SHAPE
central, MB, DB, L

TRIANGULAR FOSSA, pit on each

Buccal and lingual surfaces visible

Converge lingual

35
Q

Mandibular First Molar
CROSS SECTION

A

Wider MD than BL

One orifice
D root
M root (2 root canals)

36
Q

Mandibular Second Molar
BUCCAL VIEW

A

4 cusps

Taller lingually (lingual cusps seen)

1 B developmental groove
No pit

Buccal groove in line with furcation

37
Q

Mandibular Second Molar
LINGUAL VIEW

A

Lingual developmental groove

Cusps shadow and taller

38
Q

Mandibular Second Molar
MESIAL VIEW

A

Rhomboidal

Mesial cusps taller than distal

M root wider and longer than distal

39
Q

Mandibular Second Molar
DISTAL VIEW

A

Mesial root visible

Distal cusps farther apart than buccal

Root is conical and tapers evenly, simple

40
Q

Mandibular Second Molar
OCCLUSAL VIEW

A

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

41
Q

Mandibular Second Molar
CROSS SECTION

A

Wider MD than BL

One orifice
D root
M root

Usually one root canal

DH121 Oral Biology (7 decks)

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