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oral anatomy > mandibular 1st molars > Flashcards

mandibular 1st molars Flashcards

1
Q

When do mandibular 1st molars begin formation?

A

At birth

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2
Q

When do mandibular 1st molars erupt?

A

6–7 years

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3
Q

When is root completion for mandibular 1st molars?

A

9–10 years

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4
Q

What numbers are the mandibular 1st molars?

A

19 & #30

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5
Q

Which teeth are normally the largest in the mandibular arch?

A

Mandibular 1st molars

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6
Q

Which are usually the first permanent teeth to erupt?

A

Mandibular 1st molars

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7
Q

How many cusps or developmental lobes do mandibular 1st molars have?

A

5

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7
Q

What are the three buccal cusps of mandibular 1st molars?

A

MB, DB, and D

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7
Q

What are the two lingual cusps of mandibular 1st molars?

A

ML and DL

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8
Q

How many cusps can be seen from the buccal view of mandibular 1st molars?

A

3

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9
Q

What is the shape of the mesial outline in the buccal view of mandibular 1st molars?

A

Convex crown, slightly concave at the cervical third

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9
Q

Which surface is wider on the mandibular 1st molars : buccal or lingual?

A

Buccal

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10
Q

What is the shape of the distal outline in the buccal view of mandibular 1st molars?

A

Rounded or convex

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10
Q

How many developmental buccal grooves are present on mandibular 1st molars?

A

2

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10
Q

Where are the mesial and distal contact areas located on mandibular 1st molars?

A

At the junction of the occlusal and middle thirds

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10
Q

Name the two developmental buccal grooves on mandibular 1st molars.

A

MB groove and DB groove

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11
Q

Are the Mesial Lingual and Distal Lingual cusps on the mandibular 1st molars almost equal in size

A

Yes

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11
Q

What is the profile of the lingual surface in mandibular 1st molars?

A

Convex

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11
Q

What separates the ML and DL lingual cusps of mandibular 1st molars?

A

Lingual developmental groove

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12
Q

How do lingual cusps compare to buccal cusps on mandibular 1st molars?

A

Lingual cusps are higher and more pointed

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13
Q

How many roots do mandibular 1st molars have?

A

Two roots: mesial and distal

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14
Q

How does the root trunk of mandibular 1st molars compare to mandibular 2nd molars?

A

The root trunk is shorter on the 1st molar than the 2nd

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15
Q

How do the roots of mandibular 1st molars compare to mandibular 2nd molars?

A

Roots are more divergent toward the apex on the 1st molar

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16
Q

Are the roots of mandibular 1st molars usually straight or bent?

A

Many roots are bent

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17
Q

What is the most common direction of root bending in mandibular 1st molars?

A

Toward the distal

18
Q

How far is the root bifurcation of mandibular 1st molars from the CEJ?

A

3mm

19
Q

How does the furcation of mandibular molars compare to maxillary molars?

A

It is closer to the cervical line in mandibular molars than in maxillary molars

20
Q

Which cusp is longer and more pointed from the mesial view: ML or MB?

A

Mesial Lingual cusp

21
Q

How is the crown oriented from the mesial view?

A

Tilted lingually

22
Q

Which root is broader and longer in mandibular 1st molars?

A

Mesial root

22
Q

Can you see the distal root from the mesial view of mandibular 1st molars?

A

No

23
Q

What is the shape of the CEJ from the mesial view of mandibular 1st molars?

A

Slightly curved

24
Q

How does the crown appear from the distal view of mandibular 1st molars?

A

The crown is shorter, allowing more of the occlusal surface to be seen

25
Q

How does the distal root compare to the mesial root in mandibular 1st molars?

A

The distal root is smaller than the mesial root

26
Q

What can be seen behind the distal root from the distal view of mandibular 1st molars?

A

The wider mesial root

27
Q

What shape does the occlusal view of mandibular 1st molars resemble?

A

Pentagon

28
Q

How many triangular ridges are present on the mandibular 1st molar?

A

4

28
Q

What are the five functional cusps of mandibular 1st molars, from largest to smallest?

A

MB > ML > DL > DB > D

29
Q

What is the order of the cusps from highest to lowest in mandibular 1st molars?

A

ML > DL > MB > DB > D

30
Q

Which triangular ridges are longer on the mandibular 1st molar?

A

The triangular ridges of the lingual cusps are longer

31
Q

How many fossae are present on the mandibular 1st molar?

A

3

31
Q

What does the distal transverse ridge consist of in the mandibular 1st molar?

A

triangular of DB
triangular of DL

32
Q

What does the mesial transverse ridge consist of in the mandibular 1st molar?

A

triangular of MB
triangular of ML

33
Q

How many transverse ridges are present on the mandibular 1st molar?

A

2

34
Q

What are the three fossae of the mandibular 1st molar?

A
  1. Large central fossa/pit
  2. Smaller mesial triangular fossa/pit
  3. Smallest distal triangular fossa/pit
35
Q

What is the largest fossa/pit in the mandibular 1st molar?

A

central fossa/pit

36
Q

What is the second to last smallest triangular fossa/pit in the mandibular 1st molar?

A

mesial triangular fossa/pit

37
Q

What is the smallest triangular fossa/pit in the mandibular 1st molar?

A

distal triangular fossa/pit

38
Q

What is the main groove that runs through the mandibular 1st molar?

A

Central groove

39
Q

What are the two grooves that branch off the central groove?

A

Mesial and Distal grooves

40
Q

Where does the MB groove start and extend on mandibular 1st molars?

A

Starts at the central pit and extends between the MB and DB cusps

41
Q

Where does the DB groove start and continue on mandibular 1st molars?

A

Starts at the central pit/groove and continues between the DB and D cusps

42
Q

Where does the lingual groove start and extend on mandibular 1st molars?

A

Starts at the central pit and extends lingually between the ML and DL cusps

43
Q

What is the characteristic pattern of grooves on mandibular 1st molars?

A

Y-pattern: 2 buccal grooves and the lingual groove

44
Q

Are supplemental groove present on mandibular 1st molars?

A

Yes

45
Q

What are the three triangular grooves on mandibular 1st molars?

A
  1. Mesiobuccal
  2. Mesiolingual
  3. Distolingual
46
Q

What are the two marginal grooves on mandibular 1st molars?

A
  1. Distal
  2. Mesial
47
Q

Why is the mandibular 1st molar important in occlusion?

A

Its role is crucial, as its loss can significantly affect occlusion.

48
Q

Why is the mandibular 1st molar more likely to be lost?

A

It is the first permanent tooth to erupt into the oral cavity, making it more susceptible to damage or decay.

49
Q

Why are buccal pits on mandibular 1st molars at increased risk of caries?

A

Due to increased dental biofilm retention and the thinness of enamel forming the walls of the pit.

oral anatomy (8 decks)

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