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CHRONOLOGY OF
CROWN FORMATION
Introduction
Chronology :
Defined as “a study which deals with the timings
of various stages of tooth development. starting
with the initiation of the first dental tissue laid down
to the emergence of tooth in the oral cavity and its
completion of calcification”.
CHRONOS : TIME
•Beginning of calcification:
Calcification is the accumulation of calcium salts in a body tissue. causing it to harden.
“various stages”BY ORDER:
•Crown completed.
•Eruption. ★
•Root completed.
By classes:
-incisors
-canines
-premolars*
-molars
PERMANENT
32
Teeth should be
well arranged
INCISORS
CENTRAL
LATERAL
UPPER
CENTRAL
LATERAL
LOWER
CANINES
MAXI - MAND
•Beginning of calcification
•Crown completed.
4-5 months4-5 months
6-7 years6-7 years
11-12 years 9-10 years
13-15 years 12-14 years
•Eruption. ★
•Root completed.
PREMOLARS
MOLARS
DECIDUOUS ➤ PERMANENT
U4 U5
L4 L5
These are
Deciduous
Molars
DECIDUOUS
20
REFERENCES
• Tooth Eruption Dates by Dr Alexander Teckkam | Oct 15, 2017 -
https://www.dentistryblogger.com/eruption-dates/
• Deciduous & permanent teeth charts PocketDentistry -
https://pocketdentistry.com/2-development-and-eruption-of-the-teeth/
THANK YOU

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Chronology of crown formation