Posterior tooth anatomy

Question 1

shape of lower 7’s

Answer 1

more oblong/squarer than 6’s

Question 2

how many cusps on a lower 7

Answer 2

4

Question 3

lower 7 - are lingual or buccal cusps higher?

Answer 3

lingual cusps are higher and slightly more pointed

Question 4

how many occlusal fossae do lower 7’s have?

Answer 4

3 - mesial central distal

Question 5

fissure pattern for lower 7

Answer 5

hot cross bun shape - midline fissure and lateral fissure
marginal fissures - short extensions from mesial and distal pits
marginal fossae - triangular (triangular fossa?)

Question 6

what are axial grooves?

Answer 6

extend from lateral fissures between cusps

Question 7

what are the marginal ridges?

Answer 7

mesial and distal barrier

Question 8

what is the function of the marginal ridge?

Answer 8

keep food on the occlusal table
prevents food trapping

Question 9

what is usually the largest lower tooth?

Answer 9

lower 6

Question 10

general shape of lower 6

Answer 10

oblong (like lower 7)

Question 11

which surface of the lower 6 is rounder, buccal or lingual?

Answer 11

flat lingual surface
more rounded buccal surface

Question 12

how many cusps does lower 6 have?

Answer 12

5 cusps

Question 13

order cusp sizes from largest to smallest

Answer 13

mesio lingual
disto lingual
mesio buccal
centro buccal
disto buccal

Question 14

what is the fissure pattern for lower 6?

Answer 14

dryopithicus
5 cusps where the bases of the disto and mesio lingual and centrobuccal cusps meet the central fossa

Question 15

which side of the lower 6 has more cusps?

Answer 15

buccal size has 3 cusps, lingual side has 2 cusps

Question 16

axial groovers of lower 6

Answer 16

divides convex buccal surface into 3 lobes

Question 17

what is a buccal pit?

Answer 17

present in 60% of lower first molars
found on buccal surface

Question 18

clinical relevance of buccal pit?

Answer 18

difficult to clean
predilection to caries
may require sealants

Question 19

marginal ridges of lower 6

Answer 19

mesial is shallower than distal
dissection groover crossing the distal marginal ridge is often deep

Question 20

which upper molar is larger?

Answer 20

upper 1st molars are usually larger than upper 2nd molars (6 > 7)

Question 21

shape of upper first molar

Answer 21

outline resembles a rhombus

Question 22

how many cusps does upper 6 have?

Answer 22

4 cusps

Question 23

how many cusps does upper 7 have?

Answer 23

4 cusps

Question 24

where are cusp tips of upper 7 located?

Answer 24

corners of the rhombic outline

Question 25

which cusp is largest and smallest on upper 6?

Answer 25

large mesiopalatal cusp small distopalatal cusp

Question 26

what is the size of the buccal cusps of upper 6?

Answer 26

buccal cusps are similar size

Question 27

what is the cusp of carabelli?

Answer 27

5th cusp extension to mesiopalatal cusp

Question 28

what is the crista obliqua?

Answer 28

in upper first molars there are distinguished by a prominent oblique ridge (between MP and DB)

Question 29

Fissure pattern of upper 6

Answer 29

draw in head lol

Question 30

what are palatal pits?

Answer 30

occur commonly at the end of the palatal axial groove. on upper 6's

Question 31

shape of upper 7's

Answer 31

similar to upper 6

Question 32

what is the distopalatal cusp called?

Answer 32

hypoconus

Question 33

does upper 7 have a cusp of carabelli?

Answer 33

usually not

Question 34

how does the distopalatal cusp vary with the tooth?

Answer 34

distopalatal cusp diminishes in size from 6 to 7 to 8

Question 35

fissure pattern of upper 7

Answer 35

buccal lateral fissure may be angled distally

Question 36

shape of upper 5

Answer 36

egg-shaped, oval, rounded (oval is longer on B-P axis than M-D)

Question 37

how are upper 5's different to upper 4's

Answer 37

upper 5 and 4 are similar but 5 usually more rounded and more symmetrical

Question 38

is the buccal or palatal upper 5 wider?

Answer 38

wider buccally than palatally

Question 39

how many cusps do upper premolars have?

Answer 39

2

Question 40

what are transverse ridges?

Answer 40

approximately perpendicular to the tooth midline in upper 5

Question 41

how many fossae in upper 5's?

Answer 41

2 - one mesial and one distal

Question 42

fissure pattern of upper premolars

Answer 42

primary fissure pattern very simple known as h form

Question 43

dissectional grooves of upper 5

Answer 43

less obvious than other teeth and might be absent/poorly defined

Question 44

where is palatal cusp tip of upper 4 placed?

Answer 44

palatal cusp tip mesially placed

Question 45

cusps of upper 4 compared to upper 5

Answer 45

upper 4 buccal cusps are higher than palatal but upper 5 have more even buccal and palatal cusps 4 has sharper cusps

Question 46

how many roots of upper 4?

Answer 46

upper 4 may have 1 or 2 roots

Question 47

which tooth has the canine groove and what is it?

Answer 47

single rooted upper 4's concavity on the mesial surface, often extending from mesial disectional groove

Question 48

lower 5 shape

Answer 48

squarer occlusal outline

Question 49

how many cusps does lower 5 have?

Answer 49

3 cusps

Question 50

how many fossae does lower 5 have?

Answer 50

3 fossae

Question 51

what ridges does lower 5 have?

Answer 51

transverse and oblique ridges

Question 52

which part of the lower 5 is the most curved?

Answer 52

buccal cusp is more curved

Question 53

what fissure pattern shape does the lower 5 have?

Answer 53

Y-form - 3 cusps, unique and most common sometimes has H form

Question 54

which premolar is the smallest in the mouth?

Answer 54

lower 4

Question 55

shape of lower 4

Answer 55

circular outline buccal cusp makes up the bulk of the crown

Question 56

fossae and fissures of lower 4

Answer 56

2 fossae (distal is larger) fissures may be poorly developed/absent

Question 57

does the lower 4 have well defined transverse ridges?

Answer 57

yes mesial dissectional groove orientated lingually

Question 58

How do the posterior teeth occlude?

Answer 58

Upper 2nd premolar - cusp tip positioned between lower 2nd premolar and 1st molar Upper 1st molar - medial buccal cusp fits into buccal groover of lower 1st molar Upper 2nd molar - medial buccal cusp fits into buccal groover of lower second molar