Week 4: Development, form & eruption

tooth germ

soft tissue that develops into a tooth; grows 6th week of fetal life

crypt

early tooth socket

primary dentin

formed at early stage before root completion

secondary dentin

formed after root formation or completion; formed within the tooth by odontoblasts - continues throughout one’s entire lifetime

reparative dentin

laid down locally as protection for the pulp from irritation, caries or trauma

4-5 month of fetal life

when does primary teeth begin to calcify?

calcification

hardening of tooth tissues by the deposition of mineral salts within these tissues; continues until 3-4 years after birth when deciduous roots are fully formed

25 years when roots of wisdom teeth become calcified

when does permanent teeth stop calcification?

coalescence

fusion of lobes

developmental grooves

junction that forms the union of lobes marked by lines on the tooth

developmental lobes

tooth develops 4 or more centres, centres grow from tooth germ

mamelons

incisal ridges of these labial developmental lobes; separated by developmental grooves

mesiofacial, centrofacial, distofacial lobes

what are the 3 lobes of mamelons?

cingulum

what is 1 sole lingual lobe called?

6-8 months

when do deciduous central incisors erupt?

10-16 months

when do deciduous lateral incisors erupt?

14-18 months

when do deciduous first molars erupt?

17-23 months

when do deciduous canines erupt?

23-31 months

when do deciduous second molars erupt?

7-9 years old

when do permanent later incisors erupt?

9-10 years old

when do permanent mandibular canines erupt?

10-12 years old

when do permanent first premolars erupt?

10-12 years old

when do permanent second premolars erupt?

11-12 years old

when do permanent maxillary canines erupt?

11-13 years old

when do permanent second molars erupt?

17+ years old

when do permanent third molars erupt?

attrition

wearing away of the tooth through contact of its functioning surfaces