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Teeth

Teeth

The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...

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Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

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Dental maturation in a Chinese sample using Demirjian method.

Yue Fei^1,2,3, Lianyi Yang^1,2,3, Kai Sheng^1,2,3

¹Department of Pediatric Dentistry, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Annals of Human Biology

|October 4, 2021

Summary

This study established a dental maturity reference for Chinese children using panoramic radiographs. The Demirjian method generally overestimated dental age, highlighting the need for sample-specific calibration in forensic and clinical dental age estimation.

Keywords:

Mandibular dental development dental age estimation maturity table sex difference the Demirjian method

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Area of Science:

Forensic Anthropology
Pediatric Dentistry
Human Biology

Background:

Dental calcification data is crucial for clinical, archaeological, and forensic contexts.
Existing dental maturity data for Chinese children is limited, necessitating updated references.

Purpose of the Study:

To create a mandibular dental maturity reference table for Chinese children and adolescents.
To evaluate the accuracy of the Demirjian method for dental age estimation in this population.

Main Methods:

Analysis of 2091 panoramic radiographs from 1008 males and 1083 females aged 3-15 years.
Mandibular teeth (excluding third molars) were assessed using Demirjian's criteria for developmental stages.
Age-of-attainment and sex differences were statistically analyzed; dental age was compared to chronological age.

Main Results:

Females exhibited earlier tooth maturation than males, with significant differences in developmental stages D-G.
The Demirjian method resulted in an overestimation of dental age for both sexes (males: 0.68±1.05 years; females: 0.59±0.97 years).

Conclusions:

The established relationship between mineralization stage and chronological age serves as a valuable reference for Chinese children's mandibular dental maturity.
The Demirjian method requires calibration for accurate dental age estimation in Chinese populations due to systematic overestimation.