lectures 8 & 9 - molars and primary dentition

Question 1

when do 1st molars erupt

Answer 1

around 6 years

Question 2

when do 2nd molars erupt

Answer 2

around 12 years

Question 3

when do 3rd molars erupt

Answer 3

if they erupt, usually around 17-22 years

Question 4

does anything come before the permanent molars

Answer 4

no

Question 5

functions of molars

Answer 5

mastication
maintenance of vertical dimension of face
maintenance of arch continuity for proper alignment
support cheeks

Question 6

how many developmental lobes do molars have

Answer 6

one developmental lobe per molar cusp

Question 7

height of contour in molars

Answer 7

facial - cervical third
lingual - middle third

Question 8

maxillary first molars

Answer 8

widest tooth buccolingually
often has a small 5th cusp called the cusp of carabelli

Question 9

where is the cusp of carabelli located

Answer 9

mesiolingual margin

Question 10

what is an arch trait for maxillary molars

Answer 10

oblique ridge

Question 11

maxillary 1st molar roots

Answer 11

3 - MB, DB, L

Question 12

furcation

Answer 12

area between roots where they divide from the trunk

Question 13

how many root canals do maxillary 1st molars have

Answer 13

4, there are two in the MB root alone
also 4 pulp horns

Question 14

how many cusps do maxillary 2nd molars have

Answer 14

4 - 3 large (MB, DB, and L) 1 small (DL often missing)
can be in tricuspid form with the loss of the DL cusp

Question 15

how many roots do maxillary 2nd molars have

Answer 15

3 - MB, DB, and L

Question 16

roots close together all confined within crown outline

Answer 16

roots get closer together the farther you go back in the mouth

Question 17

how many root canals and pulp horns do maxillary 2nd molars have

Answer 17

4 root canals - MB has 2 alone
3-4 pulp horns depending on cusp number

Question 18

what are tubercles

Answer 18

projection in enamel, all maxillary molars may have them

Question 19

mandibular 1st molar traits

Answer 19

largest mesiodistal dimension in any tooth
5 cusps (MB, DB, and small D)
2 buccal grooves
no oblique ridge - two transverse ridges

Question 20

lingual tilt of crown

Answer 20

characteristic of mandibular posterior teeth

Question 21

what pattern is the central groove in mandibular 1st molars

Answer 21

zigzagged

Question 22

how many roots do mandibular 1st molars have

Answer 22

2 roots - M and D
root bifurcate near cervical line (more likely to see furcation)

Question 23

how many root canals and pulp horns do mandibular 1st molars have

Answer 23

3 root canals: 2 in mesial root
5 pulp horns, only tooth to have 5

Question 24

mandibular 2nd molars characteristics

Answer 24

2 buccal cusps, 2 lingual cusps
lingual tilt of crown
3 fossa
one buccal grove, one lingual groove

Question 25

mandibular 2nd molars occlusal surface

Answer 25

2 transverse rides like 1st molar
cross pattern

Question 26

how many roots do mandibular 2nd molars have

Answer 26

2, less spread

Question 27

how many root canals and pulp horns do mandibular 2nd molars have

Answer 27

3 root canals, 2 in mesial root
4 pulp horns, one for each cusp

Question 28

pericoronitis

Answer 28

inflammation of the tissue around the teeth, very painful

Question 29

operculum

Answer 29

flab of tissue on tooth

Question 30

when are all primary teeth starting to calcify

Answer 30

18-20 weeks prenatally

Question 31

first to erupt for primary teeth

Answer 31

mandibular central incisors (6 months)

Question 32

second to erupt for primary teeth

Answer 32

other incisors (maxillary lateral incisors last)

Question 33

third to erupt for primary teeth

Answer 33

first molars

Question 34

forth to erupt for primary teeth

Answer 34

canines

Question 35

fifth to erupt for primary teeth

Answer 35

second molars (at about 2 years)

Question 36

functions of primary teeth

Answer 36

chewing
support for teeth and lips
necessary for formation of clear speech
critical for maintaining space

Question 37

baby bottle syndrom

Answer 37

when a baby is put to bed with milk and it bathes the teeth to cause erosion

Question 38

traits of all primary teeth

Answer 38

smaller in size than permanent with the same name
crowns appear to be squeezed at CEJ
relatively longer roots than crowns
whiter in color
fewer anomolies

Question 39

what is the difference between a primary pulp chamber and a permanent pulp chamber

Answer 39

the primary is larger

Question 40

primary max. central

Answer 40

wider MD than long ways
no mamelons
more prominent cingulum
single root

Question 41

primary max. lateral

Answer 41

smaller than central
longer in length than width
incisal angles are more rounded
root is longer than crown

Question 42

primary mand. centrals

Answer 42

similar to successor but smaller
prominent cingulum

Question 43

primary mand. laterals

Answer 43

crown is wider and longer than central
incisal edge slopes distally
cingulum is more developed with a deeper lingual fossa

Question 44

primary max. canines

Answer 44

considerable smaller than successor
sharper cusp tip when first erupted
root twice as long as crown

Question 45

primary mand. canines

Answer 45

smaller than max. canines
smoother lingual surface
single root not as long as max.

Question 46

primary molars

Answer 46

primary second molars resemble permanent first molars

Question 47

primary max 1st molars

Answer 47

may resemble maxillary premolars
may have 3 or 4 cusps
maxillary 1st premolar replaces these teeth

Question 48

primary max. 2nd molars

Answer 48

larger than primary max 1st molar
may have a cusp of carabelli
4 cusps
3 roots
oblique groove

Question 49

primary mand. 1st molar

Answer 49

does not resemble any other tooth
4 cusps
2 roots

Question 50

primary mand. 2nd molar

Answer 50

larger than 1st molar
closely resembles form of permanent mand. 1st molar
5 cusps
2 roots