chronology of the dent it ions
Post on 10-Apr-2015
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Order of Eruption
6 4 5 3 2
6 4 5 3 1
3 4 8 6 7 1 9 10
2 3 5 7 8 1 9 10
Deciduous Permanent
Maxillary
Mandibular
The contra-lateral side has the same order of eruption
Times of developmental stages
First evidence of calcification Crown completed Afterwards tooth commences movement towards the
occlusal plane until:
Occlusal contact with the opposing tooth What is meant by eruption in the charts? Time needed until root completion
2 - 3 years for permanent 1 - 1.5 years for deciduous
Root completion
Can teeth tell the age?
Estimation vs. determinationMeans of investigation Clinical examination Models X-rays (OPG)
Significance Forensic investigations Before confirming an existing abnormality in
tooth development or sequence of development
AGE ESTIMATION
Tips Locate the medline and count the teeth Identify all deciduous and permanent teeth Identify any abnormality
Hint: look at the contra-lateral tooth unless the abnormality is symmetrical
Exclude any abnormal teeth from age estimation Choose teeth close to a “stage” whose age can be known from the
chart In the chart, eruption refers to the last stage of pre-functional eruptive
stage when the occlusal contact is established For root completion consider teeth about to have completed roots not
teeth with completed roots Take as many clues as you can then estimate the average age of all
clues
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