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Tooth Anatomy

Tooth Anatomy

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: Jun 20, 2026

Inducing Apical Periodontitis in Mice

Inducing Apical Periodontitis in Mice

Published on: August 6, 2019

Floating retained root lesion mimicking apical periodontitis.

Ming-Pang Chung¹, Chih-Ping Chen, Yi-Shing Shieh

¹Department of Operative Dentistry and Endodontics, Tri-Service General Hospital and National Defense Medical Center, Taipei, Taiwan.

Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics

|September 1, 2009

Summary

A retained root tip from a molar tooth mimicked apical periodontitis on dental radiographs. Surgical removal confirmed the root tip, and the patient recovered fully, showing lesion healing.

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Area of Science:

Dentistry
Oral Pathology
Radiology

Background:

Retained root tips can present diagnostic challenges in endodontics.
Radiographic interpretation is crucial for identifying periapical lesions.
Differential diagnosis for periapical radiolucencies is broad.

Observation:

A retained root tip from a left lower first molar was found near the left lower second premolar apex.
Radiographs showed an ill-defined periapical radiolucency with a radiodense component, mimicking apical periodontitis.
Differential diagnoses included focal sclerosing osteomyelitis and ossifying fibroma.

Findings:

Excisional biopsy revealed the retained root tip with associated granulation tissue.
The patient remained asymptomatic with healing of the periradicular lesion after one year.
The associated premolar tooth responded normally to vitality testing.

Implications:

This case highlights the importance of considering retained root tips in the differential diagnosis of periapical lesions.
Accurate radiographic interpretation and biopsy are essential for definitive diagnosis.
Conservative management of retained root tips can lead to favorable outcomes.