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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.
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Tooth Anatomy

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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.

Tonsillitis II: Management

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This lesson will focus on the different treatment options for managing tonsillitis, which typically depend on the cause and severity.

Impact

Impact

Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
When particles with different initial velocities collide, they induce deformation by applying equal and opposite impulses. At the point of maximum deformation, the particles move together with...

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Related Experiment Video

Updated: May 31, 2026

Experimental Model of Ligature-Induced Peri-Implantitis in Mice

Experimental Model of Ligature-Induced Peri-Implantitis in Mice

Published on: May 17, 2024

Impacted wisdom teeth.

Thomas B Dodson¹, Srinivas M Susarla

¹Harvard School of Dental Medicine and Centre for Applied Clinical Investigation Surgery, Massachusetts General Hospital, Boston, USA.

BMJ Clinical Evidence

|July 7, 2011

Summary

This summary is machine-generated.

Prophylactic removal of asymptomatic impacted wisdom teeth is debated. This systematic review evaluates the effectiveness and safety of prophylactic extraction, active surveillance, and various surgical techniques for impacted third molars.

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Last Updated: May 31, 2026

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Area of Science:

Dentistry
Oral Surgery

Background:

Impacted wisdom teeth (third molars) are common, affecting a significant portion of young adults.
They can lead to pain, infection, and damage to adjacent teeth and bone.

Purpose of the Study:

To systematically review evidence on prophylactic removal of asymptomatic impacted wisdom teeth.
To compare the effects of different surgical methods for impacted wisdom tooth extraction.

Main Methods:

Systematic review of 25 studies (reviews, RCTs, observational studies).
Searched major databases (Medline, Embase, Cochrane Library) up to July 2009.
Included harms alerts and GRADE evaluation of evidence quality.

Main Results:

Identified 25 relevant systematic reviews, RCTs, or observational studies.
The review synthesizes information on various interventions for impacted wisdom teeth.

Conclusions:

Presents information on the effectiveness and safety of prophylactic extraction, active surveillance, and surgical methods.
Provides a basis for clinical decision-making regarding impacted wisdom teeth management.