Primary dentition part 1

Question 1

when does resorption begin

Answer 1

1-2 years after the root formation is completed

Question 2

where does resorption begin

Answer 2

at the apex of the tooth

Question 3

why are primary teeth important

Answer 3

-mechanical chewing
- maintenance of space for permanent teeth
-speech
- appearance
- stimulate growth of mandible and maxilla

Question 4

what are accessional teeth

Answer 4

the other 12 permanent teeth that erupt distal to primary second molars

Question 5

what are major comparisons between primary and permanent teeth

Answer 5

Primary teeth are:
-crowns are overall smaller
- crowns are more bulbous
-pronounced cervical constriction
- lighter in color
-enamel is thinner and has a consistent thickness
-large pulp chambers with prominent horns
-enamel rods are in a different direction
-occlusal convergence

Question 6

what direction are enamel rods in primary dentition

Answer 6

the rods at the cervix slope horizontally or occlusally instead of gingivally as in the permanent tooth

Question 7

what is occlusal convergence

Answer 7

occlusal surfaces are relatively smaller in primary teeth

Question 8

how are roots different in primary teeth

Answer 8

roots are longer and more slender, molar teeth have short rooth trunk, roots of posterior teeth are very flared

Question 9

how many lobes do maxillary central incisors develop from

Answer 9

4

Question 10

what is a special feature of the primary maxillary central incisor

Answer 10

MD width is greater than IG length

Question 11

how is the primary maxillary lateral incisor different from the permanent maxillary lateral incisor

Answer 11

IG length is greater than MD length
-distoincisal angle is more rounded than the central incisor

Question 12

how is the primary maxillary canine different from the permament maxillary canine

Answer 12

mesial slope of the cusp is longer than distal
-cusp height is longer
- mesial and distal contacts are at the same level

Question 13

how is the primary mandibular central incisor different from the permanent

Answer 13

theyre the same

Question 14

how is the primary mandibular lateral incisor different from the permanent

Answer 14

the same, lingual anatomy more pronounced than primary central incisor

Question 15

how is the primary mandibular canine different from the primary maxillary canine

Answer 15

-doesnt look as constricted at the neck
-cervical ridges not as pronounced
- not as wide FL
- distal cusp slope is longer than mesial