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RD1 Lecture > Molars > Flashcards

Molars Flashcards

1
Q

Each developmental lobe forms how many cusps

A

One cusp per lobe

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2
Q

Compare molar crown height to other teeth

A

Molar crowns are shorter occlusocervically than all other crowns

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3
Q

Max cusp lengths in order

A

ML

MB

DB

DL

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4
Q

What shape are max molars from the occlusal view?

A

Twisted and more square

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5
Q

Root fraction placement

A

Mand molars is closer to the cervical line, making root trunk short

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6
Q

What shape are mand molars? Exception?

A

They are more rectangular in shape

Exception: mand first molars are pentagon shape

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7
Q

Max and mand molars proximal view

A

Crown centered over root

Mand
Crown tipped linguallly over root

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8
Q

Molars are ______ occlusocervically than mesiodistally

A

SHORTER

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9
Q

Max molars have how many roots

Mand molars have how many roots

Sizes and number of canals

A

Max- 3, palatal is the longest, DB is shortest
Roots are trunkated
Usually 3-4 canals

Mand- 2 roots and usually M root is longest
Usually 3 canals
2 canals in mesial root

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10
Q

Max molar roots are closer together on which tooth

A

Roots are closer together on max 2 molars

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11
Q

Oblique ridge

A

DB to ML cusps for this ridge

Most prominent on max 1 molars, on max molars only

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12
Q

First permanent teeth to show evidence of calcification at birth?

A

First molars

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13
Q

Max molars buccal view

Mand molars buccal view

A 
ML cusp visible
2 buccal cusps
Buccal groove 
Deep developmental groove on root
Longer root trunk
Crown centered over root 
Mand
2 or 3 buccal cusps
Both lingual cusps visible
2 buccal grooves 
Shorter root trunk
Crown tipped distallly on root
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14
Q

Mand 2 molar has how many cusps

A

4 cusps

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15
Q

Max 2 molars with only three cusps are called what

A

Tricuspid form

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16
Q

From occlusal view, the contacts of max molars are all

A

Located buccal to the center of the tooth, mesial contact is more buccal than the distal

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17
Q

Four functions of molars

A
  1. Chew food
  2. Vertical dimension, prevent chin from moving up
  3. Maintain arch integrity, help keep other teeth in proper alignment
  4. Provide cheek support, keep cheeks from sinking in, maintain esthetics of face
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18
Q

Three obvious functions so of posterior teeth

A
  1. Chew food
  2. Provide support
  3. Maintain vertical dimension
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19
Q

Max molars are _____ BL than MD

A

Wider

20
Q

HOC for all molars

A

Same as premolars

PROXIMAL VIEW:
Buccal HOC is cervical third

Lingual HOC is the middle third

21
Q

Contact areas for molars

A

Near the junction of the occlusal/middle third

The distal is more cervical than the distal

22
Q

Buccal HOC and lingual HOC for all molars

A

Buccal HOC is cervical

Lingual HOC is middle

23
Q

How many cusps do max molars have and size

Exceptions

A

3 to 5 cusps
ML is usually the largest and the longest
DL is usually the smallest or nonexistent

When there are 4, the DL is the smallest

Max second molars usually have 3 cusps, the DL cusp is missing

Max first molars usuallly have a fifth cusp, cusp of caribelli
On lingual surface of ML cusp

24
Q

Widest tooth in upper arch

A

Max 1 molar

25
Q

Largest to smallest cusps on mand 1 molars

A

ML

DL

MB

DB

DB2

26
Q

How many cusps do mand molars have and sizes

Exception

A

4 usually, they are all large
2 lingual cusps are about equal size

Most mand first molars have a fifth cusp that is smaller and located dismally to the DB cusp

27
Q

What percent of the MD dimension do max and mand molars take up?

A

Max- 44%

Mand- over half of the MD dimension

28
Q

Number of cusps on mand 1 molar

A

3 buccal
2 lingual

Usually 5 total

29
Q

Which cusps are taller on mand molars

A

Lingual cusps are taller than buccal cusps on mand molars

30
Q

Max 2 molar roots from the proximal view

A

Do not spread as much as the first molars

They stay within the confines of the crown

31
Q

Mand molars are ______ MD than BL

A

Wider

32
Q

Are molars considered succedaneous teeth?

A

NO!!! They do not replace baby teeth, they come in behind them

33
Q

Molar contact location

A

All molar contacts are:

Mesial: occlusal middle
Distal: middle

34
Q

Most molars from the occlusal view taper to which sides? What is the exception

A

BL: Most molars get narrower going to the lingual side, the lingual is shorter than the Buffalo

MD: Most molars get narrower going to the distal side, the distal is shorter than the mesial

BL Exception: max first molars with large DL cusps, taper to the buccal, buccal is shorter than the lingual

MD Exception: mand first molars, the widest aspect going from M to D is the middle third , the lingual embrasure may be wider than the facial embrasure

35
Q

Tricuspid form max molars

A

Are max 2 molars

They have NO lingual groove bc they have no DL cusp or lingual root depression

36
Q

What is the exception to the 1 cusp per lobe rule?

A

The max first molar cusp of carabelli does NOT have its own lobe

37
Q

Result of vertical dimension loss

A

Eventually creates an overbit/over jet because the jaw eventually closes too far
This is called a protruding chin

38
Q

Max 2 molar roots are inclined more ___ than max 1 molars

A

Distally

39
Q

What teeth have the largest root to crown ratio

A

Mand molars

40
Q

Crowns on mand teeth are tilted ______ over the roots

A

Lingually

41
Q

Crown height tapers to which side from the buccal view of a max molar

A

Crown tapers and is shorter on the distal than the mesial

42
Q

Tricuspid molars are what shape

A

1/3 of Max 2 molars are heart shaped

43
Q

Max molars lingual view

Mand molars

A

Lingual groove off center towards distal
ML cusp larger

Mand
Lingual groove usually centered
ML and DL cusps are about same size

44
Q

How many cusps do max and mand molars have?

A

Max- 4

Mand- 5

45
Q

Majority of max 2 molars have how many cusps

A

4 cusps

In 3 cusp teeth the DL cusp is missing

46
Q

Tooth with largest MD length

A

Mand 1 molars

47
Q

Describe occlusal surface of molars

A

Have a broader occlusal surface than any other teeth, both faciolingually and mesiodistally

RD1 Lecture (10 decks)

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