Molars Flashcards
When drawing a line through the cusp tips, the ___ teeth form an arc and the ___ teeth form a straight line.
Anterior
Posterior
The lingual cusp line can be extended through the lingual cusp tips of the ___ teeth.
Maxillary posterior
The buccal cusp line can be extended through the buccal cusp tips of the ___ teeth.
Mandibular posterior
The lingual cusp line is for the ___ posterior teeth while the buccal cusp line is for the ___ posterior teeth.
Maxillary
Mandibular
Molar crowns are longer ___ than ___.
Mesiodistally
Occluso-cervically
Which molar’s crown tapers from the lingual to the buccal?
Maxillary first molar
Generally, molar crowns taper from ___ to ___.
Buccal to lingual
Mesial to distal
Molar crown height on the mesial is ___ than on the distal.
Longer
What is the functional cusp on maxillary teeth?
Lingual cusp
The ___ cusps of maxillary premolars occludes with the ___ of antagonist.
Lingual
Distal fossa
The mesiolingual cusp of maxillary molars occludes with the ___ of antagonist.
Central fossa
The distolingual cusp of maxillary molars occludes with the ___.
Distal marginal ridge of antagonist and mesial marginal ridge of distal tooth
What is the working cusp of mandibular teeth?
Buccal cusp
The buccal cusps of premolars and mesial buccal cusps of mandibular molars occludes with the ___.
Marginal ridges
The distal buccal cusps of mandibular molars occludes with the ___.
Central fossa of antagonist
The mandibular molars have ___ roots. How does this compare to maxillary molars?
2 (mesial, distal)
Maxillary molars have 3 roots
The ___ root of mandibular molars is longer and curved. How does this affect extraction?
Mesial, more likely to break during extraction
Mandibular molars are longer ___ than ___. Compare this to maxillary molars.
M-D than B-L (longer than they are wide)
Maxillary molars are wider than they are long
What is the largest tooth in the mandibular arch?
Mandibular 1st molar
The mandibular 1st molar has ___ cusps and ___ roots.
5, 2
What teeth are formed from 5 lobes?
Mandibular 1st molar, 2nd molar, and maxillary 1st molar
Describe the roots of the mandibular first molar
2 wide roots
Mesial root: curves distally
Distal root: straighter
The crown of the mandibular first molar is ___ than it is ___.
Longer (M-D), tall (cervico-occlusally)
How can you differentiate the mandibular first and second molar occlusally?
The manidbular first molar has a small distal cusp (5 cusps) that disappears for mandibular 2nd molar (4 cusps)
The mandibular first molar has ___ developmental grooves. Name them.
4 Central Mesiobuccal Distobuccal Lingual
The mandibular first molar has ___ fossa. Name them.
3
Central (major) fossa
Mesial and buccal (minor) fossae
The central groove of the mandibular first molar extends between the mesial and distal fossae only. T/F
False, the central fossa ends at the mesial fossa but extends past the distal fossa
The mandibular first molar’s largest cusp is ___ and the smallest cusp is ___.
Mesial buccal
Distal
Which cusps (buccal or lingual) of the mandibular first molar are taller? Why?
Lingual
Buccal cusps are flat since they are functional for grinding food
Lingually, you can see all 5 cusps of the mandibular first molar. T/F
False, the lingual cusps are taller than the buccal
Can see all 5 cusps from the buccal view
The cervical line dips down on all ___ teeth.
Buccal
What grooves can be seen from the buccal aspect of the mandibular first molar?Which one is longer?
Mesiobuccal and distobuccal (longer)
Which side (lingual or buccal) of the mandibular first molar is the most prone to carries? Why?
The buccal side
The MB and DB grooves end in depressions that extend to the root, making them difficult to clean (lingual developmental groove is short, easy to clean)
Why is the mandibular first molar hard to extract?
I beam effect: developmental depressions on mesial and distal sides of both roots increases the anchorage into the tissue/bone
Shape of root: mesial root curves mesially then distally (looks like knee) and distal root declines to distal (straighter)
For the mandibular first molar, the buccal HOC is ___ and the lingual HOC is in the ___.
Cervical 1/3
Middle 1/3
For the mandibular first molar, there is a large concavity on the ___ root.
Mesial
The mandibular second molar has ___ cusps.
4
Which is usually bigger: the mandibular 1st or 2nd molar?
Mandibular 1st molar
The developmental groove pattern for the mandibular second molar resembles a ___.
+
For the mandibular 2nd molar, the ___ cusp is largest and the ___ cusp is smallest.
MB=DB
DL
For the mandibular 2nd molar, the buccal HIC is in the ___ and the lingual HOC is in the ___.
Cervical 1/3
Middle 1/3
The crowns of mandibular teeth are titled ___.
Lingually
There are ___ buccal grooves on the mandibular 1st molar and ___ on the mandibular 2nd molar.
2 (MB, DB)
1
For the mandibular second molar, the mesial contact is located in ___ and the distal contact is located in the ___.
Junction of occlusal / middle 1/3
Middle 1/3
Which tooth is most likely to be impacted?
Mandibular third molar
Mandibular 3rd molars usually have ___ roots and ___ cusps.
2 (fusion common)
4
Where is the buccal HOC in all molars? Why?
Cervical 1/3
To deflect food
Where is the lingual HOC for all molars?
Middle 1/3
Where is the mesial contact for all molars?
Junction of occlusal and middle 1/3
Where is the distal contact for all molars?
In middle 1/3
Which contact is more cervical for all molars?
Distal (in middle 1/3)
When do the maxillary first molars erupt?
6 years
What are the largest and strongest of the maxillary teeth?
Molars
Maxillary molars generally have ___ roots and ___ cusps.
3 (2B, 1L)
4 (2B, 2L)
Which tooth tapers lingual to buccal?
Maxillary first molar
What is the largest tooth in the maxillary arch?
Maxillary first molar
The maxillary first molar has ___ major cusps.
4 (Cusp of Carabelli is a supplemental cusp on ML cusp)
The maxillary first molar is ___ than ___.
Wider B-L
Long M-D
The Cusp of Carabelli is located on what cusp of which tooth?
ML cusp of maxillary first molar
The molars of the ___ arch are longer (mesiodistally) than they are wide (buccolingually).
Mandibular
The molars of the ___ arch have 3 roots.
Maxillary
The maxillary first molars have ___ roots. Describe them.
3 MB (widest), DB, lingual (longest)
The roots are concave in and wrap around the bone, giving them maximum anchorage and making them difficult to get out
For the maxillary first molar, the ___ root is the longest and the ___ root is the widest.
Lingual
MB
The occlusal aspect of the maxillary first molar has a ___ shape.
Rhomboidal
The maxillary first molar crown tapers ___ to ___ and ___ to ___.
Mesial to distal (occlusally and height of crown)
Lingual to buccal
What is the largest cusp of the maxillary first molar? Smallest?
ML
Carabelli
The maxillary first molar has ___ fossae. Identify them.
3
Central, mesial, distal
The maxillary first molar has a ___ ridge that extends from ___ to ___.
Oblique
ML cusp to DB cusp
Molars of the ___ arch have oblique ridges.
Maxillary
Maxillary first molars have ___ buccal grooves.
1 (mandibular first molars have 2)
Which grooves radiate from the central pit of maxillary first molars?
Buccal and central grooves
What grooves are seen in maxillary first molars?
Buccal
Central
Lingual
Distal
For the maxillary first molar, the distal groove is located distally to the ___ and connects to the ___ and ___ grooves.
Oblique ridge
Lingual and central grooves
For the maxillary first molar, the mesial contact is in the ___ and the distal contact is in the ___.
Junction of occlusal 1/3 and middle 1/3
Middle 1/3
From buccal aspect of maxillary first molar, the MB root curves ___ and the DB root curves ___.
Distally in middle 1/3
Mesially in middle 1/3
The maxillary first molar has a developmental groove on the ___ root.
Buccal
The lingual developmental groove is located more ___. Why?
Distally
The ML cusp is larger than the DL cusp
For the maxillary first molar, the lingual HOC is in the ___ and the buccal HOC is in the ___.
Middle 1/3
Cervical 1/3
The mesial marginal ridge of the maxillary first molar curves ___.
Cervically
The mesial contact of the maxillary first molar is located centrally (buccalingually) of the crown. T/F
False, the mesial contact is buccal to the center of the crown
From the mesial aspect of the maxillary first molar, the ___ root is wider while the ___ root is longer.
MB
Lingual
Does the maxillary first or second molar have longer roots?
Maxillary second molar (roots are as long or longer than first molar)
Does the maxillary first or second molar have a shorter crown (cervico-occlusally)?
Maxillary second molar
For the maxillary second molar, the ___ cusps are smaller.
Distal (DB, DL)
Causes more tapering to distal
For the maxillary second molar, the lingual root apex is centered over the ___ from lingual aspect.
DL cusp (slight deflection to distal)
Is the maxillary second or first molar wider (B-L)?
First and second molar are same width
What shape does the maxillary third molar have occlusally?
Heart-shaped
From facial/lingual view, all teeth have crown shaped like a ___.
Trapezoid (short side at the gingival)
From proximal view, the crown of maxillary posterior teeth is shaped like a ___.
Trapezoid (long side at gingival)
The crown of mandibular posterior teeth is shaped like a ___.
Rhombus
The roots of all teeth incline ___ except for the ____.
Distally Mandibular canine (may incline mesially)
How many pulp horns does a maxillary first molar have?
5 (# of cusps = # of horns)
The CEJ dips deeper on teeth of the ___ arch.
Maxillary
Do anterior or posterior teeth have a deeper cervical line?
Anterior
Is the mesial or distal side of a tooth expected to have greater curvature? Which way does it dip?
Mesial
Dips occlusally
All teeth develop from 4 lobes except..?
Mandibular first molar, maxillary first molar (Cusp of Carabelli), and mandibular second premolar (if 2 lingual cusps are present)
Mandibular third molar can have 5 cusps too
For all molars, the largest cusp is the ___ supporting cusp.
Mesial supporting cusp
ML for maxillary molars
MB for mandibular molars
Which tooth has a longer mesial cusp ridge than distal?
Maxillary first premolar
Which tooth has a mesial marginal ridge developmental groove?
Maxillary first premolar
What is the longest tooth?
Maxillary canine
Which tooth has the longest root?
Maxillary canine
Which posterior tooth has the most symmetrical crown?
Maxillary 2nd premolar
Which premolar is the narrowest and has the smallest roots?
Mandibular 1st premolar
Which premolar is the most likely to have only 1 root and 1 canal?
Mandibular 2nd premolar
Which tooth is the widest facio-lingually?
Maxillary first molar
Which teeth have the longest cusps?
Lingual cusps of mandibular molars
What is the longest tooth mesio-distally?
Mandibular first molar
Which tooth has the shortest crown?
Maxillary third molar (shortest overall tooth)
What is the shortest cusp in the mouth?
DB cusp of the maxillary third molar
What is the longest root for the maxillary molars? Mandibular molars?
Palatal root (maxillary) Mesial root (mandibular)
Which teeth are the most likely to be impacted?
Third molars, maxillary canine, mandibular 2nd premolar
The proximal contacts of posterior teeth are in the ___ from buccal view and ___ from the occlusal view.
Middle 1/3
Slightly buccal from middle of tooth
Identify the general traits for crown tapering / size of molars
- -Taper buccal to lingual (except max. first)
- -Taper mesial to distal occluslly
- -Crown height tapers mesial to distal
- -Longer (M-D) than they are tall (occlusocervically)
The proximal contacts are ___ to the midpoint of the interproximal surface (faciolingually).
Buccal
Is the palatal root wider buccolingually or mesiodistally?
Mesiodistally
Are the buccal roots wider buccolingually or mesiodistally?
Buccolingually
Is the palatal or buccal roots wider mesiodistally?
Palatal roots
Is the palatal or buccal roots wider buccolingually?
Buccal roots
