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what is the portion of the tooth coverd by enamel
anatomic crown
portion of the tooth that is clinically visible
clinical crown
does the clinical or anatomic crown change throughout life?
where are the cervical ridges on posterior teeth?
where are cervical ridges on anterior teeth
facial and lingual
what is an irregular depression or concavity
what are the bases of the triangle on a triangular ridge
marginal ridges
what is a depression or valley on the surface of a tooth between ridges or cusps of which the inclines meet at an angle
what is the point at which three of the tooth's five surfaces converge
point angle ex: distolinguo-occlusal, distobucco-occluso
what is the division of the root from bottom to top
apical, middle, cervical
what is the division of the crown from bottom to top
cervical, middle incisal
where do contact areas not occur?
cervical 1/3 of crown
where des tooth calcification initially occur?
incisal edge of anterior teeth and cusp tips of posterior teeth
which way does calcification proceed?
towards the apical third of root
at what point of calcification does the tooth erupt
when the root is 1/2 calcified
when does calcification begin for primary teeth
13-16 weeks in utero
when have all primary teeth initiated calcification?
18-20 weeks in utero
sequence of primary tooth calcification (general)
Central Incisor> 1st Molar> Lateral Incisor> Canine> 2nd Molar
sequence of primary tooth calcification (specific)
max /man Central Incisors 14 weeks> maxillary 1st Molar 15 weeks> mandibular 1st molar 15.5 weeks> man/max Lateral Incisor 16> man/max canine 17 weeks> man 2nd Molar 18 > max 2nd molar 19 weeks
sequence of crown completion of primary teeth
max Central Incisors 1.5 months> man central incisors 2.5 months> maxillary lateral incisors 2.5 months> mandibular lateral incisors 3 months> maxillary 1st Molar 6 months> mandibular 1st molar5.5 months> man/max canine 9 months> man 2nd Molar 10 months> max 2nd molar 11 months
eruption schedule of primary teeth
man Central Incisors 8 months> max central incisors 10 months> maxillary lateral incisors 11 months> mandibular lateral incisors 13 months> max/ man 1st molar 16 months> max canine 19 months> man canine 20 months> man 2nd Molar 27 months> max 2nd molar 29 months
root completion schedule of primary teeth
max /man Central Incisors 1.5 years> mandibular lateral incisors 1.5 years> maxillary lateral incisor 2 years> mandibular 1st molar 2.25 years > man/max 2nd molar 3 years man/max canine 3.25 years
exfoliation schedule of primary teeth
max /man Central Incisors 6.5 years> man/max lateral incisors 7.5 years> mandibular/max 1st molar 10 years > man canine 10.5 years>man/max 2nd molar/max canine 11 years
what is the first permanent cusp to form
MF cusp of first molar
all permanent anterior teeth have begun calcification when?
just after 1 year of age
when do primary first molars attempt occlusion
20 months of age
root formatio is complete for all primary teeth what what age
39 months
when is occlusion achieved
3 years
permanent 1st molars erupt at which age
6 years
primary tooth roots rapidly exhibit resorption at which age
5 years
time frame for anterior spacing
starting at 4 and progressing to 6 years of age
all primary teeth have initiated calcification when?
18-20 weeks in utero
which sex exhibitis eruption timeframes sooner?
females before males
initial mineralization of primary dentition is entirely´┐Ż
what is the last primary tooth to emerge?
maxillary 2nd molar: 29 months
root formation is complete for all primary teeth by when?
39 months/3.5 years
primate space begins to form at which age
primary tooth occlusion is evident at which age?
first permanent tooth to erupt
mandibular 1st molar 6 years
what is the last primary tooth to exfoliate?
max canine age 11-12
where do the permanent first molars emerge?
distal to primary 2nd molars
permanent calcification schedule
Max 1st Molar Birth Mandibular 1st Molar Birth Max Central 3.5 months Mandibular Central 3.5 months Mandibular Lateral 3.5 months Max Canine 4.5 months Mandibular Canine 4.5 months Max Lateral 1 year Max 1st Premolar 2 years Mandibular 1st Premolar 2 years Mandibular 2nd Premolar 2 years Max 2nd Premolar 2 years Max 2nd Molar 3 years Mandibular 2nd Molar 3 years Max 3rd Molar 9 years Mandibular 3rd Molar 9 years
how many teeth are present at age 8? Which ones?
24 teeth, 12 primary and 12 permanent
all primary teeth should be exfoliated by when?
age 12
when should second molars be erupting?
age 12
when is dentition complete
age 21
which tooth replaces the last primary tooth to be exfoliated?
permanent maxillary 2nd premolar
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