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25 Cards in this Set

  • Front
  • Back

when and where are tooth buds developed?

within the aveolar process during the 6th week of fetal life

tooth germs (buds)

small clumps of cells that have the ability to form tooth tissues, dentin, enamel, cementum and pulp

developmental lobes

growth centers that grow out from the tooth germs

coalescence

fusion of the lobes

mamelon

the three rounded protruberances of the incisal surface of a newly erupted incisor tooth

developmental grooves

lines that are marked by the junction that forms the union of the develpmental lobes

how many lobes are on the incisors?

three labial and one lingual

how many lobes are on the max and mand 1st premol?

three facial and one lingual

in terms of lobes, how are the second premols different from the 1st pre mols?

not all 2nd premols have only two cusps

how many lobes are on the molars?

two facial and two lingual. HOWEVER the FIRST molars usually have a fifth or minor lobe

lobe of carabelli

rudimentary lobe

cusp of carabelli

lobe of carabelli located on the lingual surface of the mesiolingual cusp

mesial drift

the tendency of the permanent molars to have an eruptive force toward the midline

what are the two direct effects of mesial drift?

1. spaces btw deciduous teeth are closed as the 1st perm molar pushes the deciduous molars together


2. if deciduous tooth is prematurely lost, the 1st molar moves mesially into the available space

why mesial drift a problem?

because the infringement of the perm molar into the space keeps a premolar or canine from erupting

exfoliation

the process by which the roots of a primary tooth are resorbed and issolved until so little of the root remains that the primary tooth falls out

resorption

the pressure applied on the primary tooth root by the eruption of the permanent tooth triggers the body to activate osteoclasts

osteoclasts

bone destroying cells

when does the resorption phase normally begins?

at least a year prior to the exfoliation of the tooth

impacted teeth

tooth's normal eruption into occlusion is partly or completely obstructed by cone or other teeth

what teeth are most commonly impacted?

lower 3rd molars, upper 3rd molars, max cuspids/canines

congenitally missing teeth

a tooth that never forms because the tooth bud was never produced

attrition

process of normal wear on the crown

curve of spee

curved line on the occlusal plane

occlusal plane formed...

by the teeth meeting their antagonist in the opposite arch