Age Determination- Teeth

 Temporary teeth 

Tooth	Eruption
Lower central incisor	6-8months
Upper central incisor	7-9 months
Upper lateral incisor	7-9 months
Lower lateral incisor	10-12months
First molar	12-14 months
Canine	17-18 months
Second molar	20-30 months

 Permanent teeth 

TOOTH	ERUPTION
First molar	6-7 yrs
Central incisor	6-8 yrs
Lateral incisor	8-9 yrs
1st premolar	9-11 yrs
2nd premolar	10-12 yrs
Canine	11-12 yrs
2nd molar	12-14 yrs
3rd molar	17-25 yrs

Gustafson’s Method

• The age estimation of adult over 21 years depends on the physiologic age changes in each of the dental tissues.

Attrition

• Due to wear and tear from mastication, occlusal (upper) surface of the teeth is destroyed gradually; first involving the enamel, then dentin, and at last, the pulp is exposed in the old age.
• It depends on the functional use of the teeth and also up on the hardness

Paradentosis

• Regression of the gums and periodontal tissues surrounding the teeth takes place in the advancing age, gradually exposing the necks and adjacent parts of the roots, due to which the teeth become loose and fall off.
• Poor oral hygiene increases paradentosis.

Secondary Dentin

• It may develop from the walls within the pulp cavity, and decrease the size of the cavity.
•  First it is deposited at the pulp chamber and gradually extends downwards to the apex, and may completely fill the pulp cavity.

Cementum Apposition

• The cementum increases in thickness particularly due to changes in the tooth position, especially near the end of the root.
• Secondary cementum is slowly and continuously deposited throughout life and forms incremental lines.
• Incremental lines (devised by Boyde) appear as cross-striations on the enamel of teeth due to cementum apposition and are thought to represent daily increments of growth.
• They can be seen on histological section.
• The age can be calculated by counting the number of lines from the neonatal line onwards.
• This is mainly applicable to infants.
• This is mainly applicable to infants.

Root Resorption

• It involves both cementum and dentin, which show characteristically sharp grooves.
• Absorption of the root starts first at the apex and extends upwards.
• It usually occurs in the late age.
• It may be due to pathological process.

Transparency of the Root

• It is not seen until about 30 years of age.
• The canals in the dentin are at first wide.
• With age they are filled by mineral, so that they become invisible and the dentin becomes transparent.
• It is the most reliable of all criteria

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