Dental Anatomy Permanent Molars

Question 1

the occlusal outline form of an occlusal view for the maxillary first molar is ___

Answer 1

rhomboidal

Question 2

in the occlusal outline of maxillary 1st and 2nd molars, which angles tend to be acute?

Answer 2

• mesiofacial and distolingual

- therefore, the mesiolingual and distofacial angles tend to be obtuse

Question 3

the maxillary 1st molar tends to taper in which direction/? what is the result with respect to embrasures?

Answer 3

tends to taper toward the facial rather than lingual, so the buccal embrasure is larger than the lingual

Question 4

what are the most prone facial and lingual surfaces of molars?

Answer 4

-lingual of maxillary molars and facial of mandibular molars

Question 5

the largest root of the maxillary molar is the ___

Answer 5

palatal

Question 6

the smallest root of the maxillary molar is the ___

Answer 6

distobuccal (remember, the MB root needs room for MB2 so it will be bigger than the DB root)

Question 7

in the maxillary 1st molar, from the ___ view, the apex of the palatal root is in line with the facial groove of the tooth

Answer 7

facial view

Question 8

in the maxillary 1st molar, from the ___ view, the apex of the palatal root is in line with the midpoint of the MD diameter

Answer 8

lingual view

Question 9

when a 4th canal is present in a maxillary 1st molar, it is usually present in which root/canal system?

Answer 9

MB (MB2)

Question 10

of the 3 furcations of a maxillary 1st molar, the ___ is closest to the cervical line

Answer 10

• mesial

- distance of furcations from cervical line: M < B < D

Question 11

of the 3 furcations of a maxillary 1st molar, the ___ is the furthest from the cervical line

Answer 11

• distal

- distance of furcations from cervical line: M < B < D

Question 12

the oblique ridge of maxillary molars forms the ___ boundary of the central fossa

Answer 12

distal

Question 13

in the maxillary molars, the (acute/obtuse) corners coincide with the direction of the oblique ridge

Answer 13

obtuse

Question 14

the center of the oblique ridge on a maxillary 1st molar is at the same level with the ___

Answer 14

marginal ridge

Question 15

the oblique ridge of maxillary molars connects which cusps?

Answer 15

ML and DF

Question 16

which cusp of maxillary molars occludes in the central fossa of mandibular molars?

Answer 16

ML

Question 17

which tooth has the greatest FL diameter of the crown for all teeth?

Answer 17

maxillary 1st molar (think of the cusp of carabelli)

Question 18

which maxillary posterior tooth is closest in size FL vs MD?

Answer 18

maxillary 1st molar

Question 19

is the maxillary 1st molar wider MD toward the facial or lingual?

Answer 19

facial

Question 20

what is the only cusp of the maxillary molars that is not part of the molar cusp triangle?

Answer 20

DL

Question 21

what is the largest and longest cusp on maxillary 1st molars?

Answer 21

ML

Question 22

which tooth is most commonly forced into the maxillary sinus during an extraction?

Answer 22

maxillary 1st molar

Question 23

which maxillary molar has a distal concavity that can pose special problems in matrix placement?

Answer 23

maxillary 1st molar

Question 24

does the maxillary 1st or 2nd molar have a shorter DL groove?

Answer 24

1st is shorter than 2nd

Question 25

what is the shape of a maxillary molar is the DL cusp is not present?

Answer 25

3-cusp heart shape

Question 26

the roots of maxillary 2nd molar tend to be _(more/less)_ divergent and have _(greater/fewer)_ distal inclinations

Answer 26

less, greater

Question 27

the cervical cross sectional outline of the primary maxillary 2nd molar is roughly what shape?

Answer 27

triangular

Question 28

what is the groove pattern for the mandibular 1st molar?

Answer 28

Y or dryopethicus pattern

Question 29

the occlusal outline of a mandibular 1st molar is a ___

Answer 29

pengaton

Question 30

the smallest cusp of the mandibular 1st molar is the ___

Answer 30

- distal cusp | - MB > ML > DL > DB > D

Question 31

the largest cusp of the mandibular 1st molar is the ___

Answer 31

- MB | - MB > ML > DL > DB > D

Question 32

which tooth has the largest MD crown dimensions of any other tooth?

Answer 32

mandibular 1st molar

Question 33

what are the only mandibular teeth that are wider MD than FL?

Answer 33

mandibular molars

Question 34

what are the only posterior teeth that are wider MD than FL

Answer 34

mandibular molars

Question 35

which molar has the greatest MD diameter of all molars

Answer 35

mandibular 1st molars

Question 36

which tooth has the largest FL crown dimension of any other mandibular tooth?

Answer 36

- mandibular 1st molar | - remember, the maxillary 1st molar has the greatest FL crown dimension of any tooth overall

Question 37

which tooth has the largest occluso-cervical crown dimension of any mandibular tooth?

Answer 37

mandibular 1st molar

Question 38

the facial surfaces of mandibular molars are located ___ to the border of the ascending ramus

Answer 38

medial

Question 39

what is a key feature that differentiates a mandibular 1st and 2nd molar?

Answer 39

- the number of developmental grooves | - 2nd molar has 1 buccal

Question 40

how many facial cusps does the mandibular 1st molar have?

Answer 40

3

Question 41

the developmental groove between the DF cusp and the D cusp of the mandibular 1st molar is ___

Answer 41

DF (NOT distal)

Question 42

the mandibular 1st molar usually has ___ roots with ___ canals

Answer 42

2,3

Question 43

mandibular 1st molars usually have ___ mesial canal(s)

Answer 43

2

Question 44

which molar has the longest root of any other molar?

Answer 44

mandibular 1st molar

Question 45

which tooth has the greatest root separation of any other tooth?

Answer 45

mandibular 1st molar

Question 46

what is the largest area at mid-root cross section of mandibular 1st molars?

Answer 46

mesial (think about needing room for MB2)

Question 47

which root of which tooth has the greatest FL dimension of any other root?

Answer 47

mandibular 1st molar M root

Question 48

which cusp of mandibular molars occludes in the central fossa of the maxillary molars?

Answer 48

DB cusp

Question 49

the ideal position and height of lingual cusps of mandibular 1st molars accommodates ___

Answer 49

working movement

Question 50

what is the groove pattern for the mandibular 2nd molar? what is the occlusal pattern?

Answer 50

- groove pattern is a cross (+) pattern | - occlusal pattern is a cruciform pattern

Question 51

in the occlusal view of a mandibular 2nd molar, what is the greatest FL diameter?

Answer 51

mesial 3rd (that's how you tell R from L)

Question 52

what are the only posterior teeth that are wider MD than FL?

Answer 52

mandibular molars

Question 53

what are the only mandibular teeth that are are wider MD than FL?

Answer 53

mandibular molars

Question 54

the crown of the mandibular 2nd molar inclines to the ___ and ___

Answer 54

mesial and lingual (think of the larger mesial cusps weighing it down)

Question 55

mandibular molars have the long axis of their root apices __ and their crowns ___

Answer 55

facial, lingual

Question 56

the facial surfaces of mandibular molars are located ___ to the border of the ascending ramus

Answer 56

medial

Question 57

which maxillary molar most frequently only has 3 cusps?

Answer 57

maxillary 3rd molar

Question 58

maxillary 3rd molars from an occlusal view are frequently ___ shaped

Answer 58

heart, because they are missing the DL cusp

Question 59

which teeth have the most variation in crown morphology?

Answer 59

3rd molars

Question 60

which teeth have the greatest distal root inclination of any other tooth?

Answer 60

mandibular 3rd molars

Question 61

which tooth has the shortest root of any mandibular tooth?

Answer 61

mandibular 3rd molar