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Glossary of Mandibular Molars Wilson

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What is the strongest and largest tooth in the mandibular arch
Mand 1st Molar
how many cusps are on the mand 1st molar
5 - 3 facial(mesiofacial, distofacial an distal) and 2 linguals(mesiolingual and distolingual)
what is the smallest and which is widest cusp on the mand 1st molar
distal smallest, mesiofacial widest
Which direction is the crown of the mand 1st molar widest
mesiodistal(mand 2nd has same attribute, 3rd is very circular)
What is the width relationship between maxillary and mandibular molars
maxillary are widest faciolingually in contrast to mand being widest mesiodistally
Do mand molars have an oblique ridge
no, only maxillary have oblique ridge
How many fossae do the mand 1st molars have
3 mesial, distal and central(just like max 1st molar)
Which fossa of the mand 1st molar is largest
central
which cusp on the mand 1st molar has a triangular ridge that doesnt contribute to the central fossa's borders
Distofacial
How many grooves originate from the central fossa of the mand 1st molar
4 (mesial, distal, facial and lingual)
What structures does the distofacial developmental groove run between on the mand 1st molar
Distofacial cusp and distal cusp
How many total grooves does the occlusal surface of the mand 1st molar have
5 (mesial, distal, facial, lingual and distofacial)
NOTE: the distofacial doesnt originate from central groove like the others do
do the mesial and distal borders of the mand first converge towards the lingual
yes because facial bordre is wider than lingual,
NOTE max 1st molars dont converge towards lingual
How many cusps on the mand 1st molar have lingual ridges that are triangular ridges
3, all the facial cusps
is the faciooclussal line angle of the mand 1st molar convex or is it the linguoclussal line angle that is convex
faciooclussal is convex
linguooclussal is more straight
Which of the 5 cusps on the mand 1st is longest
mesiolingual
NOTE mesiolingual slightly longer than distolingual, but distofacial is longer than mesiofacial
Which cusp is shortest on the mand 1st molar
distal
Which 2 cusps form the majority of the facial aspect of the mand 1st molar
mesiofacial and distofacial
NOTE distal forms very little of facial aspect
What is the most rounded of the 3 facial cusps on the mand 1st molar
distofacial
What area does the facial groove("buccal groove")termintate in on the facial aspect of mand 1st molar occlusocervically
middle third
NOTE termination is called buccal pit or facial pit.
Distofacial groove also fades out in middle third
From the lingual view of the mand 1st molar what 3 cusps are seen
2 lingual ones(mesiolingual and distolingual) and distal cusp
Do the facial cusp tips or lingual cusps tips have more pointed edges on the mand 1st molar when viewed from proximal
lingual
Which of the two marginal ridges is located higher(more occlusally) than the other on the mand 1st molar
mesial marginal ridge
Which marginal ridge of the mand 1st molar has a longer faciolingual dimension
mesial
which proximal surface is more convex on the mand 1st molar
distal
How many cusps are visible from the distal view of the mand 1st molar
all 5
DUE TO DISTAL MARGINAL RIDGE BEING LOCATED MORE GINGIVALLY THAN THE MESIAL MARGINAL RIDGE- TOOTH SLOPES FROM MESIAL TO DISTAL
Where do both max and mand molars have their contacts located occlusocervically
middle third of crown
How do the HOC's of mand and max molars differ and "equivocate"
The facial of both mand and max are both in cervical 1/3 and 1/2mm

However the linguals differ between the 2
mand molars have lingual HOCs in middle 1/3 and 1 mm but Max lingual HOCs are middle 1/3 and 1/2 mm
How are mandibular molars tilted when in the alveolar bone
lingually, helps to keep tongue out of occlusal surface when chewing
How many terminal roots do mand molars usually have
2 - distal and mesial
Where do prominent developmental depressions reside on mand molar roots(they run from bifurcation up to cervical line)
facial and lingual surfaces
Which direction does the bifurcation of the mand molars run
faciolingually- same as bifurcation
Mesial and distal root surfaces of mand molars have longitudinal developmental grooves. On which surface are they usually most prominent
mesial
Which root of the mand molars is narrower faciolingually
distal - it also has sharper apex
in contrast mesial root apex is described as more rounded
When sitting in the mouth do mand molars tilt slightly distal or slightly mesially
mesially
Which terminal root is generally longer on mand molars
mesial
NOTE root with sharper apex is usually shorter of the 2
Which direction do the roots of mand molars tend curve
distally
How many pulp horns does the mand 1st molar have
5, one for each lobe
NOTE differs from max cause max 1st only has 4 pulp horns
how many root canals are most prevalent in mand 1st molars
3
When 3 canals are present the larger, kidney shaped single canal is usually located in which root
distal
NOTE circular 2 canals are in mesial root
What are the names of the 3 canals found in mand 1st molars
distal, facial canal of mesial root and lingual canal of mesial root
the facial canal and distal canal of the mesial root of the mand 1st molars are usually connected by small horizontal tunnels running in what direction
faciolingual
T or F the mand 2nd molar is bigger in all dimensions than the mand 1st molar
F, mand 2nd is smaller in all dimensions than first
how many cusps does the mand 2nd molar have
4, thus 4 lobes
Which mand molar has the most equally sized cusps
mand 2nd molar
which proximal surface of the mand 2nd molar has a longer distance faciolingually
mesial
what are the names of the 4 cusps on the mand 2nd molar
MF, DF, ML, DL
the occlusal surface of the mand 2nd molar resembles what shape
oval, with long axis in meisodistal direction
Does the 2nd mand molar have a similar number of triangular ridges on its occlusal surface as the mand 1st molar
yes, therefore the mand 2nd also has mesial, distal and central fossae
How many facial grooves does the mand 2nd molar have running onto its facial surface
1
NOTE mand 1st has 2, facial groove and distofacial groove
How many cusps are visible from a facial view of the mand 2nd molar
only 2 because they are all 4 equally sized so you only see the 2 on the side your viewing. compared to all 5 being visible on mand 1st molar due to their varied lengths
Which mand molar has a deeper central fossa, 1st or 2nd
mand 1st molar
Which mand molar has more convergence mesiodistally towards the lingual, 1st or 2nd
1st
which groove facial or distofacial of the mand 1st molar comes down lower on the facial surface
Facial
rank the 5 cusps of the mand 1st molar in size from largest to smallest
mesiofacial, mesiolingual, distolingual, distofacial and distal

NOTE for height tallest to shortest it goes
mesiolingual, distolingual, distofacial, mesiofacial, distal

Pattern rotates if you disregard distal since its last on both lists
if a mand 1st molar has 6 cusps where is the 6th cusp located
between 2 lingual cusps
what are the eruption ages for the mand molars
1st 6(6-7), 2nd 12(11-13) and 3rd 20(17-21)
How many cusps are most frequent on mand 3rd molars
4
NOTE 5 cusp arrangement tends to have way more supp. anatomy
out of the 3 mand molars which has the smallest occlusal table
3rd
Which mand molar has more variable roots 1st or 2nd
2nd
of the 2 mand molars 1st and 2nd which one has roots that tend to deflect more distally
2nd
how many pulp horns does the mand 2nd molar have
only 4, not 5 like in 1st molar because 2nd only has 4 cusps
All molars have 2 antagonist upon regular occlusion except for which ones
max 3rd molars
Which mand molar would have roots most likely to be fused
mand 3rd molar
how many terminal roots are generally found in the mand arch molars and max arch molars
2 and 3 respectively
What are the most common number of root canals in both max and mand 1st molars
4 and 3 respectively
What are the number of pulp horns most commonly found in max and mand 1st molars
4 and 5 respectively
Both the mand and max 1st molars have 5 cusps but how are they diferrentiated
The max has Cusp of Carabelli and its lingually located while the mand 1st has distal cusp which is facially located
The eruption of the mand molars follows or precedes the eruption of the maxillary molars
precedes generally
upon eruption of the mand 1st molar it is in mesial contact with which tooth
distal side primary mand 2nd molar
the shape of the max first molar is described as ______ while the shape of the mand 1st molar is ______
varies from rhomboid to quadrilateral and
elliptical
normally both max and mand 1st molars have _______ cusps and ______ lobes
5 and 5
all teeth have 2 antagonists except for which 2 teeth
mand central incisors and max 3rd molars
a major difference between mand and max molars is what
faciolingual widths of crowns
with molar teeth the names of the different embrasures are
buccal, occlusal and lingual
max molars can be differentiated from mand molars by what
number/arrangement of terminal roots

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