How can you tell age from human bones? How to calculate an individual s bone age

The age change of bones is a very complex and comprehensive process, and is often influenced by many factors such as nutritional status and development. Bones of the same age sometimes have different age characteristics, and bones with similar or identical age characteristics may sometimes belong to individuals of different ages. Therefore, it is not possible to achieve absolute accuracy in the determination of the age of bones under normal circumstances, but nevertheless, this work is still of important reference value.

In general, the age of the skeleton of a juvenile individual is significantly more accurate than that of an adult.

Age is inferred from the time of tooth eruption.

Tooth eruption refers to the whole process of tooth eruption from the crown to the gum to the occlusal contact of the upper and lower jaw teeth. The eruption time of the tooth is based on the time when the crown of the tooth emerges into the gum. Under normal circumstances, the teeth press a certain amount of time.

Order. Left and right sprout in pairs. In general, the lower jaw teeth erupt slightly earlier than the eponymous teeth in the upper jaw, and the teeth erupt slightly earlier in girls than in boys.

These internal regularities in the process of tooth eruption provide a more reliable basis for us to judge the age of bones.

By the time the baby is born, the middle incisors of the mandibular breast begin to erupt, and by the age of months, all the baby teeth are complete. At about the age of age, the first permanent tooth erupts behind the second molar, the first molar, and then under the pressure of the growth and development of the permanent tooth, the root of the primary tooth is gradually absorbed and loosens and falls off. The permanent teeth erupt one after the other.

This alternation of permanent and deciduous teeth generally lasts until the end of age. With the exception of the third molar, it takes about a year for all the permanent teeth to erupt. The third molars do not begin to erupt until around the time they enter adulthood, and some people are delayed, and some people do not emerge for life.

The degree of wear and tear of teeth is related to age.

When humans are eating, friction occurs between teeth and food, and between teeth due to the flourishing of chewing movements, resulting in wear and tear on the maxillofacial and incision ends of teeth. In general, the degree of tooth wear increases with age, but it is also affected by the type of food, teeth and chewing habits. These factors should be taken into account in the application of this basis of judgment.

Bone age can be inferred from cartilage, and of course age is known.

It can also be seen by the proportion of calcium in the bones.

Objective: To obtain data on human bone sex, age, height and limb bone length during the two-week period. Method:

The characteristics of 761 human bones were studied by observation and measurement. Results: Among the 752 intact skeletons, 456 were males, accounting for; 296 cases were females, accounting for them; In this group, 12 cases were juveniles, 1 60 were young, 6 25 were young, 225 were prime, 29 92 were middle-aged, 302 were middle-aged, 40 16 were middle-aged, and 166 were elderly, accounting for 22 07.

Male height 1 47 1 70 m, average (1 58 5 82) m; Female height 1 38-1 62 m, average (1 53 2 04) m. Measurements were made of the main long bones of the limbs, and a large amount of data was obtained. Conclusion:

Of the 761 skeletons at the site, there are more males than females. Only 22,07 people live to old age. The people at this site are of low height and have correspondingly short limb bones.

Go to the hospital for a bone age test.

Biological age (bone age) A difference in age at life within 1 year is called normal development.

Biological age (bone age) Difference in age of life "1 year old is called early development (abbreviation: precocious puberty).

Biological age (bone age) The difference in age at life < 1 year old is called developmental delay (abbreviation: late maturity).

Abnormalities in bone age are often an aspect of certain endocrine disorders in pediatrics. Many diseases will affect bone development, or make it advance or make it backward, such as adrenal hyperplasia or tumors, Alreb-ERT syndrome, precocious puberty, hyperthyroidism, ovarian granulosa cell tumor, etc., which will lead to early bone age; Ovarian hypoplasia (Turner syndrome), achondroplasia, pituitary dwarfism, hypothyroidism, etc., will lead to a significant backwardness in bone age.

The relationship between bone age and chronological age can be expressed in terms of bone age difference. That is, the difference between chronological age and bone age, which is also the specific age difference between the two. If the difference between actual age and bone age is positive, it means that bone age lags behind age. If the bone age difference is negative, it means that the bone age is ahead of the age.

Usually 2 years is considered to be the normal range for bone age difference, where bone age difference is normal within 1 year of age. When the rate of bone age increase is greater than the rate of height growth, the epiphyseal heals early, the growth period is shortened, and finally the adult height is reduced.

More than 5 years is a big abnormality. Stop growing too early. Height must be a problem.

Generally speaking, a difference of 2 years is considered the limit of normal conditions.

If the difference is too large, then there may be an endocrine disorder.

According to forensic science, a person's bone age is exactly the same as his age. Don't believe the kind of stalls outside to sell health care products, their so-called testing is all for RMB services!

This is not necessarily, and there is a part of the genetic problem.