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Tooth Anatomy01:21

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.
Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Teeth01:15

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...
Introduction to Scalers01:21

Introduction to Scalers

Many familiar physical quantities can be specified completely by giving a single number and the appropriate unit. For example, "a class period lasts 50 min," or "the gas tank in my car holds 65 L," or "the distance between the two posts is 100 m." A physical quantity that can be specified completely in this manner is called a scalar quantity. The word "scalar" is a synonym for "number." Time, mass, distance, length, volume, temperature, and energy are some examples of scalar quantities.
Scalar...

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Related Experiment Video

Updated: Jun 14, 2026

Roughness Impact of Piezoelectric Dental Scaler on Two Distinct Flowable Composite Filling Materials
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Variations in human DEJ scallop size with tooth type.

Delia S Brauer1, Grayson W Marshall, Sally J Marshall

  • 1Division of Biomaterials and Bioengineering, Department of Preventive and Restorative Dental Sciences, University of California San Francisco, Box 0758, San Francisco, CA 94143-0758, USA. d.brauer@qmul.ac.uk

Journal of Dentistry
|April 3, 2010
PubMed
Summary

Posterior teeth, like molars, have larger dentino-enamel junction (DEJ) scallops than anterior teeth, indicating enhanced stability under higher chewing forces. Scallop shape did not significantly differ across tooth types.

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Area of Science:

  • Dental Anatomy
  • Biomaterials Science
  • Biomechanics

Background:

  • The dentino-enamel junction (DEJ) is crucial for tooth stability.
  • Its scalloped structure is thought to enhance mechanical interlocking and resist delamination.
  • Understanding variations in DEJ morphology is key to comprehending tooth function and failure modes.

Purpose of the Study:

  • To investigate potential differences in the size and shape of dentino-enamel junction (DEJ) scallops among various human tooth types.
  • To correlate DEJ scallop morphology with tooth type and inferred masticatory loads.

Main Methods:

  • Permanent human teeth (molars, premolars, canines, incisors) were used.
  • Enamel was demineralized using EDTA.
  • Scallop area and circularity were measured using scanning electron microscopy (SEM).

Main Results:

  • Statistically significant differences in scallop area were observed between tooth types (p<0.05).
  • Posterior teeth (molars, premolars) exhibited larger scallops compared to anterior teeth (canines, incisors).
  • No significant differences in scallop shape (circularity) were found across tooth types.

Conclusions:

  • Larger DEJ scallops in posterior teeth likely enhance resistance to higher masticatory forces.
  • These findings suggest a functional adaptation of DEJ morphology to mechanical stress.
  • The results may inform the design of biomimetic interfaces in materials science.