posterior and primary teeth module 3

Question 1

which teeth are considered the posterior teeth?

Answer 1

pre-molars and molars

Question 2

where is the posterior height of contour for the buccal surface?

Answer 2

cervical third

Question 3

where is the posterior height of contour for the lingual surface?

Answer 3

middle third

Question 4

are posteriors wider labiolingually or mesiodistally?

Answer 4

yes, expect mandibular molars

Question 5

is the CEJ curvature less pronounced on posteriors?

Answer 5

yes

Question 6

what are the characteristics of the maxillary first pre-molar?

Answer 6

larger crown than 2nd pre-molar
long occlusal central groove
buccal cusp longer than lingual
mesial cusp slope longer than distal
mesial features: marginal groove, developmental depression, deeper CEJ curvature
bifurcated root with root trunk-elliptical on cross section
gets fractured easily

Question 7

what are the characteristics of the maxillary second pre-molar?

Answer 7

smaller crown than the 1st pre-molar
two cups same length
short central occlusal groove
increased supplemental grooves
no mesial surface features
lingual cusp offset to the mesial
single rooted elliptical on cross section

Question 8

what are the characteristics of the mandibular first pre-molar?

Answer 8

smaller crown than 2nd pre-molar
lingual cusp smaller than buccal
"snake eyes" occlusal fossae
mesial surface features
mesial cusp slope shorter than distal
has a mesiolingual groove
single rooted-ovoid or elliptical on cross section
acts more like a canine than a molar

Question 9

what are the characteristics of the mandibular second pre-molar

Answer 9

larger crown than 1st pre-molar
usually 3 cusps: Y groove pattern or 2 cusps: H or U groove pattern
increased supplemental grooves
distal marginal ridge more cervically located-occlusal more visible from distal
single rooted-ovoid or elliptical on cross section
acts more like a molar

Question 10

what teeth are the molars?

how are the roots displayed for maxillary molars?

Answer 10

1, 2, 3, 14,15,16
17,18,19,30,31,32

2 roots on buccal
1 root on lingual

Question 11

what are that characteristics of the maxillary first molar?

Answer 11

largest tooth in the arch, largest crown in dentition
has 4 major cusps-buccal cusps almost equal in height
has a fifth minor cusp of carabelli-near mesiolingual cusp and prominent oblique ridge
mesiolingual cusp longer and larger, but less sharp than distolingual cusp
trifurcated roots with root concavities, and trunks
divergent roots; furcations well removed from CEJ
lingual groove get a lot of cavities, goes across and into side of tooth

Question 12

what will happen if you loose your fist molar?

Answer 12

mesial drift

Question 13

what are the characteristics of the maxillary second molar?

Answer 13

smaller crown than 1st molar
heart-shaped (3 cusps) or rhomboidal crown (4 cusps)
less prominent oblique ridge
mesiobuccal cusp longer than distobuccal; no 5th cusp
distolingual cusp smaller or absent
mesiolingual cusp longer and larger but not as sharp as distolingual cusp
trifurcated roots, less divergent roots with root concavities and trunk

Question 14

what are the characteristics of the maxillary third molar?

Answer 14

smaller crown than 2nd molar
variable crown form heart shape (3 cups) rhomboidal shape (4cusps)
distobuccal cusp shorter than mesiobuccal cusp
roots curved distally and usually fused
if had to pick want to loose this molar
has the most variations with roots
usually easy to extract

Question 15

how many roots do mandibular molars have?

Answer 15

2

Question 16

what is the first permanent tooth to erupt?

Answer 16

the mandibular first molars

19&30

Question 17

what are the characteristics of the mandibular first molar?

Answer 17

first permanent tooth to erupt
widest crown mesiodistally
five cusps with Y groove pattern
buccal groove may end in buccal pit
distal cusp smallest and sharp
bifurcated roots with trunks and convavities
divergent roots with furcations well removed from CEJ

Question 18

what will happen if you loose your mandibular first molar?

Answer 18

mesial drift

Question 19

what are the characteristics of the mandibular second molar?

Answer 19

smaller crown than 1st molar
four cusp with cross-shaped groove pattern
wider on mesial than distal
buccal height of contour towards occlusal
lingual more cervical
bifurcated roots, less divergent, with root trunks and concavities, furcations closer to CEJ

Question 20

what are the characteristics of the mandibular third molar?

Answer 20

smaller crown than 2nd molar
wider buccolingually on mesial than on distal
fused root: irregular curved with sharp apices
4 cusps
commonly impacted more frequently than maxillary third molar

Question 21

what are dilacerations?

Answer 21

bent roots

Question 22

what are mulberry molars and what are they caused by?

Answer 22

a multiple rounded rudimentary enamel cusps on the permanent first molars they are physically defected permanent molars caused by syphilis
related to Hutchinson’s disease

Question 23

what is an enamel pearl?

Answer 23

an extra bit on enamel that will show up on x-rays is a developmental thing might feel like calculus and is usually on the buccal side

Question 24

what is fusion?

Answer 24

when tooth buds fuse together

Question 25

what is concrescence?

Answer 25

happens when cementum overgrows and hooks roots together

Question 26

what is a peg third molar?

Answer 26

pointy baby shark teeth, that are small and partially missing is a developmental abnormality of the third molars

Question 27

what is a dentigerous cyst?

Answer 27

happens with tooth does not erupt all the way, weakens bone, and has to be surgically removed

Question 28

what does the primary dentition include?

Answer 28

20 teeth total
12 anteriors and 8 posteriors
want to have diastamas in primary teeth (spaces)

Question 29

why do you want to detect decay in primary dentition early?

Answer 29

because pulp chambers are big and enamel is smaller and it does not take long to get to dentin and then the pulp chamber

Question 30

what are the main differences between primary and permanent teeth?

Answer 30

primary teeth have a white crown permanent have a yellower crown, primary have a smaller overall size permanent have a larger overall size, primary have a prominent cervical ridge permanents do not, primary teeth have narrower roots that are more divergent permanent teeth have wider roots that are less divergent

Question 31

which primary teeth are most similar to permanent teeth?

Answer 31

the primary second molars and the permanent first molar

30&T and 3&J

Question 32

canines are also know as what?

Answer 32

cuspids

Question 33

pre-molars are also know was what?

Answer 33

bi-cuspids

Question 34

which teeth are the most common congenitally missing teeth?

Answer 34

29&20 (mandibular second pre-molars)