1- Teeth begin its calcification long before its date
2- When tooth erupts the crown and about 3
the root is completed.
3- Roots are completed after eruption by 1-1.5
years (for deciduous) and after eruption by 3
years (for permanent).
4- Roots of deciduous teeth begin resorption 3
years before shedding.
:For deciduous teeth
• Enamel organ for deciduous teeth appears from 7-9
• Beginning of calcification of deciduous from 4-6 m.i.u.
• Deciduous Canines erupt after deciduous1st molars.
• Mandibular teeth erupt before maxillary teeth.
• Shedding occurs at the same date of eruption of
• Shedding of deciduous teeth occurs from 7-11 years
Lower before upper
Beg. Of Eruption
completed (Y) of root res.
At birth, first permanent molar is the only permanent *
. tooth showing evidence of calcification
Dates of eruption of permanent incisors is the same as *
.deciduous incisors but in years
. Premolars start calcification between 1 2 & 2 2 y*
.Lower teeth sequence of eruption is 1 2 3 4 5*
.Upper teeth sequence of eruption is 1 2 43 5*
.Lower teeth erupts before upper opposing teeth *
First, second& third molars erupt at ages of 6,12,18 *
. years respectively
not yet erupted &less 5&4&3
than 1/3 of root formed
Calcified separate 8
cusps are formed
C&D&E most of
crown& less than 7
1/3 root formed
root of 6
is erupted their 2&1