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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 and...

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The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.

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Related Experiment Video

Updated: Jul 24, 2026

Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants

Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants

Published on: March 29, 2018

A case of multiple rootless teeth: A case report and review.

Sivakumar Gopalakrishnan¹, Nandakumar Balasubramaniam², Raghini Ramamoorthi¹

¹Department of Oral Pathology, Madha Dental College and Hospital, Chennai, Tamil Nadu, India.

Journal of Oral and Maxillofacial Pathology : JOMFP

|March 14, 2022

Summary

Dentin dysplasia is a rare genetic disorder affecting teeth. This case report details a rare Type I presentation in a 26-year-old male, highlighting diagnostic and psychological aspects.

Keywords:

Dentin dysplasia rootles teeth tooth anomaly

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Last Updated: Jul 24, 2026

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Area of Science:

Dentistry
Genetics
Pathology

Background:

Dentin dysplasia is a rare, autosomal dominant hereditary disorder affecting dental hard tissues, with an incidence of 1:100,000.
It can occur in isolation or as part of broader systemic conditions like Ehlers-Danlos syndrome.
First described in 1920 and termed in 1939, it is classified into Types I, II, and III.

Observation:

This article presents a rare case of Type I dentin dysplasia in a 26-year-old male.
The report focuses on the clinical, radiological, ground section, and histopathological features of the condition.
Type III dentin dysplasia specifically affects only the secondary dentition.

Findings:

The case highlights the clinical presentation of Type I dentin dysplasia.
Radiological, ground section, and histopathological analyses provide detailed insights into the condition's characteristics.
The study underscores the rarity of Type I dentin dysplasia.

Implications:

Early diagnosis and intervention are crucial for managing dentin dysplasia.
Addressing the condition can significantly improve the individual's psychological well-being.
Understanding the diverse presentations of dentin dysplasia aids in comprehensive patient care.