Dental Anatomy Primary Dentition

Question 1

primary teeth are _(more/less)_ mineralized than permanent teeth, and are consequently _(more/less)_ worn

Answer 1

less mineralized, more worn

Question 2

the difference in space from the primary to the permanent dentition is ___mm

Answer 2

2-4mm

Question 3

mamelons that remain beyond the age of 10 generally indicate what type of bite pattern?

Answer 3

open bite

Question 4

calcification of primary roots in normally completed by age ___

Answer 4

3-4 years

Question 5

what is the usual pattern of eruption for primary teeth?

Answer 5

• centrals, laterals, 1st molars, canines, 2nd molars
• front to back except canine
• lowers before uppers except laterals
• girls before boys
• slim before stocky

Question 6

where does the primate space develop in maxillary primary dentition? what about mandibular primate space?

Answer 6

• maxillary - between lateral and canine
• mandibular - between the canine and the 1st molar

Question 7

what is the most frequent cause of primary spacing for the anterior teeth?

Answer 7

growth of the dental arches

Question 8

the direction of primary enamel rods in the cervical 3rd is in what direction? what about permanent?

Answer 8

• primary - occlusal direction
• permanent - apical direction

Question 9

primary molar roots are _(more/less)_ divergent than permanent molar roots

Answer 9

more

Question 10

do primary or permanent molars lack identifiable root trunks?

Answer 10

primary

Question 11

which primary tooth has the smallest faciolingual crown dimension?

Answer 11

primary mandibular central incisor

Question 12

which primary tooth is the most bilaterally symmetrical?

Answer 12

mandibular central incisor (same for permanent dentition)

Question 13

in delayed resorption of primary incisors, the permanent incisors usually eruption in what direction?

Answer 13

lingual

Question 14

the primary central incisor has a prominent cervical ridge on what locations?

Answer 14

both the facial and lingual surfaces

Question 15

from the facial view, the crown of a primary canine has a mesial cusp ridge that is _(longer/shorter)_ than the distal cusp ridge

Answer 15

longer

this means that the cusp tip will be offset to the distal

Question 16

the primary maxillary 1st molar has a crown that somewhat resembles what permanent tooth?

Answer 16

a premolar

Question 17

the primary maxillary 1st molar has roots that resemble what permanent tooth?

Answer 17

maxillary molar

Question 18

which primary maxillary tooth has the most prominent cervical ridge, and what surface is it on?

Answer 18

maxillary 1st molar on the MF surface

Question 19

which primary tooth generally has an oblique ridge?

Answer 19

maxillary 2nd molar

Question 20

the primary maxillary 2nd molar is the only primary posterior tooth to have what 3 things?

Answer 20

• oblique ridge
• transverse ridge (primary mandibular 1st molar has this as well)
• DL groove

Question 21

the primary ___ molar generally exhibits a cusp of carabelli

Answer 21

maxillary 2nd molar

Question 22

what are the last primary teeth to erupt?

Answer 22

maxillary 2nd molars

Question 23

the primary maxillary 2nd molar exhibits _(more/less)_ cusps than the primary maxillary 1st molar

Answer 23

more

Question 24

the primary maxillary 2nd molar most resembles what permanent tooth?

Answer 24

maxillary 1st molar

Question 25

the primary tooth that has the most distinctly prominenet facial cervical ridge is the ___

Answer 25

mandibular 1st molar

(vs maxillary 1st molar, which has the most prominent cervical ridge of the maxillary teeth only)

Question 26

from the facial view of a primary mandibular 1st molar, the CEJ is most apically positioned in what area?

Answer 26

the mesial 3rd

this is a result of its prominent facial cervical ridge

Question 27

the primary mandibular 1st molar usually exhibits a _(mesial/distal)_ triangular fossa

Answer 27

distal

Question 28

which primary tooth has the most distinct transverse ridge?

Answer 28

mandibular 1st molar

Question 29

what permanent tooth does the primary mandibular 1st molar resemble?

Answer 29

none

Question 30

which primary teeth differ most from permanent teeth?

Answer 30

mandibular 1st molars

Question 31

which cusp is the highest and sharpest on a primary mandibular 1st molar?

Answer 31

ML