Molars Flashcards
Each developmental lobe forms how many cusps
One cusp per lobe
Compare molar crown height to other teeth
Molar crowns are shorter occlusocervically than all other crowns
Max cusp lengths in order
ML
MB
DB
DL
What shape are max molars from the occlusal view?
Twisted and more square
Root fraction placement
Mand molars is closer to the cervical line, making root trunk short
What shape are mand molars? Exception?
They are more rectangular in shape
Exception: mand first molars are pentagon shape
Max and mand molars proximal view
Crown centered over root
Mand
Crown tipped linguallly over root
Molars are ______ occlusocervically than mesiodistally
SHORTER
Max molars have how many roots
Mand molars have how many roots
Sizes and number of canals
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
Max molar roots are closer together on which tooth
Roots are closer together on max 2 molars
Oblique ridge
DB to ML cusps for this ridge
Most prominent on max 1 molars, on max molars only
First permanent teeth to show evidence of calcification at birth?
First molars
Max molars buccal view
Mand molars buccal view
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
Mand 2 molar has how many cusps
4 cusps
Max 2 molars with only three cusps are called what
Tricuspid form
From occlusal view, the contacts of max molars are all
Located buccal to the center of the tooth, mesial contact is more buccal than the distal
Four functions of molars
- Chew food
- Vertical dimension, prevent chin from moving up
- Maintain arch integrity, help keep other teeth in proper alignment
- Provide cheek support, keep cheeks from sinking in, maintain esthetics of face
Three obvious functions so of posterior teeth
- Chew food
- Provide support
- Maintain vertical dimension
Max molars are _____ BL than MD
Wider
HOC for all molars
Same as premolars
PROXIMAL VIEW:
Buccal HOC is cervical third
Lingual HOC is the middle third
Contact areas for molars
Near the junction of the occlusal/middle third
The distal is more cervical than the distal
Buccal HOC and lingual HOC for all molars
Buccal HOC is cervical
Lingual HOC is middle
How many cusps do max molars have and size
Exceptions
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
Widest tooth in upper arch
Max 1 molar
Largest to smallest cusps on mand 1 molars
ML
DL
MB
DB
DB2
How many cusps do mand molars have and sizes
Exception
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
What percent of the MD dimension do max and mand molars take up?
Max- 44%
Mand- over half of the MD dimension
Number of cusps on mand 1 molar
3 buccal
2 lingual
Usually 5 total
Which cusps are taller on mand molars
Lingual cusps are taller than buccal cusps on mand molars
Max 2 molar roots from the proximal view
Do not spread as much as the first molars
They stay within the confines of the crown
Mand molars are ______ MD than BL
Wider
Are molars considered succedaneous teeth?
NO!!! They do not replace baby teeth, they come in behind them
Molar contact location
All molar contacts are:
Mesial: occlusal middle
Distal: middle
Most molars from the occlusal view taper to which sides? What is the exception
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
Tricuspid form max molars
Are max 2 molars
They have NO lingual groove bc they have no DL cusp or lingual root depression
What is the exception to the 1 cusp per lobe rule?
The max first molar cusp of carabelli does NOT have its own lobe
Result of vertical dimension loss
Eventually creates an overbit/over jet because the jaw eventually closes too far
This is called a protruding chin
Max 2 molar roots are inclined more ___ than max 1 molars
Distally
What teeth have the largest root to crown ratio
Mand molars
Crowns on mand teeth are tilted ______ over the roots
Lingually
Crown height tapers to which side from the buccal view of a max molar
Crown tapers and is shorter on the distal than the mesial
Tricuspid molars are what shape
1/3 of Max 2 molars are heart shaped
Max molars lingual view
Mand molars
Lingual groove off center towards distal
ML cusp larger
Mand
Lingual groove usually centered
ML and DL cusps are about same size
How many cusps do max and mand molars have?
Max- 4
Mand- 5
Majority of max 2 molars have how many cusps
4 cusps
In 3 cusp teeth the DL cusp is missing
Tooth with largest MD length
Mand 1 molars
Describe occlusal surface of molars
Have a broader occlusal surface than any other teeth, both faciolingually and mesiodistally
