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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 |
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tooth germs (buds) |
small clumps of cells that have the ability to form tooth tissues, dentin, enamel, cementum and pulp |
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developmental lobes |
growth centers that grow out from the tooth germs |
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coalescence |
fusion of the lobes |
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mamelon |
the three rounded protruberances of the incisal surface of a newly erupted incisor tooth |
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developmental grooves |
lines that are marked by the junction that forms the union of the develpmental lobes |
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how many lobes are on the incisors? |
three labial and one lingual |
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how many lobes are on the max and mand 1st premol? |
three facial and one lingual |
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in terms of lobes, how are the second premols different from the 1st pre mols? |
not all 2nd premols have only two cusps |
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how many lobes are on the molars? |
two facial and two lingual. HOWEVER the FIRST molars usually have a fifth or minor lobe |
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lobe of carabelli |
rudimentary lobe |
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cusp of carabelli |
lobe of carabelli located on the lingual surface of the mesiolingual cusp |
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mesial drift |
the tendency of the permanent molars to have an eruptive force toward the midline |
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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 |
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why mesial drift a problem? |
because the infringement of the perm molar into the space keeps a premolar or canine from erupting |
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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 |
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resorption |
the pressure applied on the primary tooth root by the eruption of the permanent tooth triggers the body to activate osteoclasts |
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osteoclasts |
bone destroying cells |
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when does the resorption phase normally begins? |
at least a year prior to the exfoliation of the tooth |
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impacted teeth |
tooth's normal eruption into occlusion is partly or completely obstructed by cone or other teeth |
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what teeth are most commonly impacted? |
lower 3rd molars, upper 3rd molars, max cuspids/canines |
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congenitally missing teeth |
a tooth that never forms because the tooth bud was never produced |
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attrition |
process of normal wear on the crown |
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curve of spee |
curved line on the occlusal plane |
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occlusal plane formed... |
by the teeth meeting their antagonist in the opposite arch |