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Dental Anatomy > Maxillary and Mandibular Molars > Flashcards

Maxillary and Mandibular Molars Flashcards

1
Q

How many cusps to maxillary first molars typically have?

A

FIVE, but that is only when the smaller Cusp of Carabelli is present

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2
Q

How many cusps do the maxillary second molars have?

A

FOUR, but once in awhile you may see one with only three.

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3
Q

How many fossae do the maxillary first molars typically have, and what are they called?

A

FOUR

Mesial Triangular Fossa

Central Fossa

Distal Fossa

Distal Triangular Fossa

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4
Q

How many grooves do the maxillary first molars have and what are they called?

A

SIX

Central Groove

Buccal Groove

Transvers Groove of the Oblique Ridge

Distal Oblique Groove

Lingual Groove

Fifth Cusp Groove

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5
Q

If the second maxillary molar only has three cusps, how many grooves will it typically have?

A

TWO

Central Groove

Buccal Groove

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6
Q

Where are the canals typically found in both the 3 canal and 4 canal first maxillary molar?

A

From the occlusal view, they are found in the mesial half of the tooth

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7
Q

What is the largest dimension of maxillary molar crowns from the occlusal view?

A

The buccolingual dimension

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8
Q

Which direction do all molar crowns (maxillary and mandibular) taper from the occlusal view?

A

Distally

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9
Q

What is the arch trait of the occlusal shape of the maxillary first molars?

A

Parallelograms (two obtuse and two acute angles)

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10
Q

Do mandibular molars have oblique ridges?

A

NO, only maxillary molars have oblique ridges

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11
Q

Where is the cusp of Carabelli on maxillary first molars?

A

On the lingual side of the mesial-lingual cusp

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12
Q

In general, how long are maxillary roots compared to the crown height?

A

Nearly TWICE as long!

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13
Q

Is the first or second maxillary molar larger?

A

The FIRST molar is larger, especially M-D

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14
Q

Where are the proximal contacts (same for all molars)?

A

Mesial - at the junction of the occlusal and middle thirds

Distal - middle third

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15
Q

Where is the trifurcation on maxillary molars?

A

Between the cervical and middle thirds of the roots

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16
Q

Which molar has roots that look the most like the handles of a pair of pliers?

A

The first maxillary molars

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17
Q

What is the order of root length (largest to smallest) for maxillary first molars?

A

Palatal (.75 mm longer than MB)

Mesialbuccal (.75 mm longer than DB)

Distalbuccal

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18
Q

What is the largest cusp on the maxillary first molars?

A

Usually the ML cusp is the largest and highest

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19
Q

If a patient only has three cusps on their second maxillary molars, which cusp is missing?

A

The DL cusp

20
Q

On both first and second maxillary molars, is the distal or mesial crown more narrow buccolingually?

A

DISTAL

21
Q

Is the marginal ridge groove more common on the mesial or distal part of the tooth?

A

MESIAL

22
Q

Where are tubercules usually found on maxillary molars if present?

A

The mesial marginal ridge of FIRST MOLARS

23
Q

Is the mesial or distal cervical line more curved?

A

MESIAL has more curvature

24
Q

Where is the mesial contact area on maxillary molars?

A

At the juncion of the occlusal and middle thirds of the crown

25
Q

Where is the distal proximal contact on maxillary molars?

A

The middle third of the crown

26
Q

What root is the longest and often banana-shaped in maxillary molars?

A

The lingual root

27
Q

Which direction from the occlusal view is longer on a mandibular molar?

A

MD

28
Q

Which tooth has the largest MD dimension of any tooth?

A

The first mandibular molar

29
Q

How many cusps do first mandibular molars have, and which is the largest?

A

FIVE

The largest is the ML cusp

30
Q

What is the smallest cusp on the first mandibular molar?

A

Distal cusp

31
Q

Which cusps are the tallest CLINICALLY in the first mandibular molars?

A

The buccal cusps even though the lingual cusps are higher when the tooth is oriented vertically due to lingual tilt

32
Q

How many cusps are present on lower second molars?

A

FOUR

33
Q

What shape are the proximal contact for lower molars?

A

Ovoid (oval like)

34
Q

Do mandibular first molars always have a fifth cusp?

A

No, it is absent 1/5 of the time

35
Q

Which, if either, mandibular molar roots are longer?

A

Neither, they are approximately the same length

36
Q

What distinguishes roots of second lower molars from first lower molars?

A

More apically tapered

More pointed

37
Q

Which direction do both lower first and second molars taper?

A

Lingually

38
Q

What is the buccal bulge?

A

It is a well-defined buccal cervical ridge found on molars

39
Q

What could be indicitive of two canals being present on the mesial root of mandibular molars (first and second)?

A

A deep mesial surface depression indicating likelihood of B and L root canals

40
Q

What is the widest portion of a lower molar?

A

Mesiodistal dimesion is wider than faciolingual (opposite for maxillary molars)

41
Q

What shape is the occlusal surface of the second mandibular molar most like?

A

Rectangle

42
Q

What shape is the occlusal surface of the first mandibular molar most like?

A

Pentagon

43
Q

How many fossae do mandibular molars possess?

A

THREE

Mesial fossa

Central fossa

Distal fossa

44
Q

What shape do the grooves in the lower second molar resemble?

A

CROSS

45
Q
A

Dental Anatomy (1 decks)

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