2. Generally:
1- Teeth begin its calcification long before its date
of eruption.
1
2- When tooth erupts the crown and about 3
of
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.
4. :For deciduous teeth
• Enamel organ for deciduous teeth appears from 7-9
w.i.u.
• 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
successors.
• Shedding of deciduous teeth occurs from 7-11 years
9. For permanent
teeth:
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
1
1
. 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
20. small part
of 4&5
More than ½ crown
of 1&2 formed
separate
cusps of 7
All deciduous
teeth erupted with
fully formed teeth
crown of 6
completed
crown 3½
21. crowns of
3&4&5 formed
is erupted 6
less than 1/3 of the
root formed
crown&1/3 root
formed
Root of lower A
resorped
crown of 7 not
completed
E no resorption
B&C&D some
amount of
resorption
25. not yet erupted &less 5&4&3
than 1/3 of root formed
Calcified separate 8
cusps are formed
C&D&E most of
their roots
resorbed
crown& less than 7
1/3 root formed
root of 6
completed
is erupted their 2&1
root completed