Most congenital defects occur from 3 to 8 weeks.
Teeth start forming in first trimester
teeth begin erupting around 6 months after birth
20 primary (deciduous) teeth.
Most kids have all primaries by 3 years of age.
Lower central incisors are the first to erupt.
32 teeth are usually in secondary teeth.
Most secondaries are are out by 12 years of age.
6 years is when first molar is out.
3rd molars generally erupt from 17 to 21
Super-numerary tooth- extra tooth
microdont- mini tooth.
Secondary pre-molars erupt where the primary molars were
4 different types of teeth: incisor (central and lateral), canines (cuspids), premolars (bicuspids), molars (top ones have 3 roots, bottom has 2)
canines have longest root in mouth.
Incisal is the “occulusals” of the anterior teeth.
Enamel is the hardest tissue on/in our body.
decay will move faster once it hits dentin.
3 parts of the tooth: anatomic crown (covered by enammel), Anatomic root (covered by cementum), and pulp chamber.
4 main dental tissues: enamel, dentin, cementum, Dental pulp.
A clinical crown is the part of the tooth that can be seen.
Fluoride and saliva can help with remineralization of teeth.
Enamel cannot be renewed, just remineralized.
Abrasion- mechanical wear
Attrition- tooth to tooth contact.
Enamel starts demineralizing at pH of 5.5
Dentin starts deminerailzing at pH 6.5 (more sensitive to acids)
Tubules in the dentin causes sensitivity. Fluid filled.
Flouride can help seal off the openings of these tubules to reduce sensitivity.
Crowns of primary teeth, molar, tends to be fatter and shorter. Stubbier. Loks like pillsberry dough boy.
The 6 year molars erupt DISTAL to the primaries. They dont take up the space of any primaries.
When primary teeth are pushed out, the primary roots are reabsorbed and they just fall out. So when the come out, you dont see a regular root on them.