oral anatomy ch 17 part 1

what teeth are #5 and #12?

max 1st premolars

what teeth are #4 and #13?

max 2nd premolars

what teeth are #21 and #28?

man 1st premolars

what teeth are #20 and #29?

man 2nd premolars

what teeth are #3 and #14?

max 1st molars

what teeth are #2 and #15?

max 2nd molars

what teeth are #1 and #16?

max 3rd molars

what teeth are #19 and #30?

man 1st molars

what teeth are #18 and #31?

man 2nd molars

what teeth are # 17 and #32?

man 3rd molars

what is the only premolar with 2 roots instead of one?

max 1st

do 1st or 2nd premolars have sharper cusps?

1st

premolars: what shape is crown outline from buccal and lingual view?

pentagon

premolars: is distal or mesial end longer?

mesial

premolars: what 2 directions are the cusps located in? (either mesial/distal or buccal/lingual)

buccal/lingual

what is the only premolar that might have 3 cusps?

man 2nd

on man 2nd premolar, where are the 3 cusps located?

buccal, mesiolingual, distolingual

which premolar has no central groove?

man 1st

why does man 1st premolar have no central groove?

has pronounced transverse ridge

which direction does the central groove run across occlusal surface?

mesiodistally

what is prominent and centrally located on buccal surface of premolars?

vertical buccal ridge

premolars: what is located on each side of buccal ridge?

buccal developmental depressions

premolars: what two horizontal features are present on buccal surface?

imbrication lines and perikymata

which premolar are imbrication lines and perikymata most prominent on?

max 1st premolars

how many lobes do premolars develop from?

4

premolars: how many facial lobes, and how many lingual lobes did they develop from?

3 facial, 1 lingual

premolars: what are the 3 facial developmental lobes?

mesial, central buccal ridge, distal

premolars: what is the lingual ridge?

lingual developmental lobe

what is the only premolar type that has 2 lingual developmental lobes instead of one, thus having a total of 5 developmental lobes?

man 2nd

premolars: where is the buccal height of contour?

cervical third

premolars: where is the lingual height of contour?

middle third

premolars: what features of these teeth is used to hold partial dentures in place?

buccal and lingual height of contour

premolars: what feature is prone to abrasion due to sticking out?

buccal and lingual height of contour

is max 1st or max 2nd premolar bigger?

1st

max premolars: crown shape from proximal view is what?

trapezoidal

max premolars: what shape is the tooth from the occlusal view?

hexagon

max premolars: what 2 directions are the roots inclinated towards?

distal and lingual

max premolars: what shape are roots, and why?

eliptical, deep root concavities

max premolars: clinical consideration- what can be mistakenly be interpreted as tooth pain?

sinusitis

max premolars: what is important to keep in mind during extraction?

roots are close to max sinus

for #5 and #12: is buccal or lingual cusp longer?

buccal

for #5 and #12: how much longer is the buccal cusp than the lingual cusp?

1mm

for #5 and #12: where does the root trunk divide into 2 roots?

apical third

for #5 and #12: what are the 2 directions the roots are located?

buccal and lingual

for #5 and #12: which of the two roots is fatter?

buccal

for #5 and #12: 2 furcations are located midway on the root surface, how many mm away from the cej?

7

for #5 and #12: what percent of the population has only 1 root on this tooth?

20%

for #5 and #12: what is a prominent and distinct feature on the root of this tooth?

mesial root concavity

which premolar is widest mesiodistally?

max 1st

for #5 and #12: where are imbrication lines located?

cervical third

for #5 and #12: is the buccal cusp more mesial or distal to the long axis of the tooth?

distal

for #5 and #12: what is unique about the buccal cusp on this tooth?

only tooth in dentition with mesial cusp slope longer than distal cusp slope

for #5 and #12: is lingual cusp more mesial or distally offset?

mesial

for #5 and #12: is the mesial cusp slope or distal cusp slope shorter on the lingual cusp?

mesial

for #5 and #12: what 2 features does the distal not have that the mesial does have?

developmental depression, marginal groove

for #5 and #12: are these teeth wider buccolingually or mesiodistally?

buccolingually

for #4 and #13: is mesial root concavity more or less pronounced compared to max 1st premolar?

less

for #4 and #13: what is a way to differentiate between the max 1st premolars and max 2nd premolars using the buccal cusp?

on 2nd, buccal cusp is shorter and rounder

for #4 and #13: is buccal or lingual cusp taller?

nearly the same

for #4 and #13: which direction is the lingual cusp displaced towards?

mesial

for #4 and #13: what two features do these teeth NOT have that the max 1st premolars did have?

mesial developmental groove and mesial marginal groove

for #4 and #13: occlusal surface is more __________ and less ____________ compared to max 1st premolars

rounded, hexagonal

is occlusal surface larger on max 2nd or max 1st premolar?

max 2nd

man premolars: buccal outline of crown has a strong inclincation in what direction when viewed from proximal?

lingual

man premolars: what shape are they from proximal view?

diamond

man premolars: root inclination is what direction?

distal

man premolars: is lingual or buccal cusp smaller?

lingual

for #21 and #28: what is unique about lingual cusp on this tooth? (2)

small and nonfunctioning

for #21 and #28: what is the small, nonfunctioning lingual cusp on these teeth similar to on max canines?

cingulum

for #21 and #28: what shape is root?

eliptical

for #21 and #28: how many pulp horns?

2

for #21 and #28: which root surface has a deep groove?

distal

for #21 and #28: what shape is the crown outline from the buccal view?

pentagon

for #21 and #28: how many developmental lobes?

4

for #21 and #28: how many buccal developmental lobes and how many lingual?

3 buccal, 1 lingual

for #21 and #28: what buccal surface feature does this tooth lack?

imbrication lines

for #21 and #28: what 3 things are on buccal surface?

2 buccal developmental depressions, 1 buccal ridge

for #21 and #28: is buccal cusp more mesial or distal?

mesial

for #21 and #28: what two structures does the mesiolingual groove separate?

mesial marginal ridge from mesial cusp slope

for #21 and #28: where does the crown tilt sharply toward lingual?

cervix

for #21 and #28: what feature is present that will help distinguish left from right?

mesial marginal groove

for #21 and #28: what shape is crown from occlusal?

diamond

for #21 and #28: instead of a central groove, what do these teeth have instead?

mesial and distal pits

for #20 and #29: what is the percent of people who have 3 cusps instead of 2?

55%

for #20 and #29: what is different about the buccal cusp compared to man 1st premolars? (2)

shorter and rounder

for #20 and #29: on 3 cusp version, is mesiolingual or distolingual cusp wider and longer?

mesiolingual

for #20 and #29: what structure is located between the mesiolingual and distolingual cusps occlusally on the 3 cusp version? (not present on 2 cusp version)

y shaped lingual groove

for #20 and #29: what structure is located on occlusal surface of two cusp version?

U shaped central groove

how many roots do maxillary molars have?

3

how many roots do mandibular molars have?

2

what are the most important teeth in the dentition for maintaining vertical dimension?

molars

are max molars wider buccolingually or mesiodistally?

buccolingually

what structure is present on all max molars except 3rd?

oblique ridge

what is the largest crown in permanent dentition?

max 1st molars

for #3 and #14: how many developmental lobes?

5

for #3 and #14: how many buccal lobes and how many lingual lobes?

2 buccal, 3 lingual

where is the additional cusp (cusp of carabelli located)?

lingual

for #3 and #14: how much longer are roots than the crown?

2x

for #3 and #14: what are the 3 roots called?

lingual, mesiobuccal, distobuccal

for #3 and #14: which root is the longest and largest?

lingual