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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.
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Deciduous teeth development in fetuses using postmortem computed tomography image analysis.

Hiroko Indo1, Hiromu Ito1, Chihaya Koriyama2

  • 1Department of Maxillofacial Radiology, Field of Oncology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima 890-8544, Japan.

Legal Medicine (Tokyo, Japan)
|October 17, 2021
PubMed
Summary

Computed tomography (CT) analysis reveals deciduous tooth calcification begins around 19 weeks gestation. This method aids in estimating fetal age and evaluating dental development for forensic dentistry applications.

Keywords:
Human fetusPostmortem CTTooth germs

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Area of Science:

  • Forensic Anthropology
  • Developmental Biology
  • Radiology

Background:

  • Fetal age estimation commonly relies on body measurements and skeletal/dental development.
  • Established dental development charts exist, but quantitative calcification rate analysis is less explored.

Purpose of the Study:

  • To calculate the calcification rate of deciduous teeth, mandibular cortical bone, and clavicle in fetuses.
  • To evaluate the efficacy of postmortem computed tomography (CT) image analysis for fetal age estimation.

Main Methods:

  • Utilized postmortem CT image analysis to assess calcification in fetal deciduous teeth, mandibular cortical bone, and clavicle.
  • Employed automated software to calculate CT values within regions of interest.
  • Performed single regression analysis to determine calcification rates.

Main Results:

  • Deciduous tooth calcification was detectable via CT in fetuses over 19 weeks gestation.
  • Bone calcification (mandibular cortical bone, clavicle) initiated earlier than deciduous tooth calcification.
  • Bone calcification proceeded at a slower rate compared to deciduous tooth calcification.

Conclusions:

  • The calcification rate of deciduous teeth, measured by CT values in fetuses, is effective for estimating fetal age.
  • The established CT-based method is valuable for evaluating deciduous teeth development and age estimation in forensic dentistry.