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Related Concept Videos

Tooth Anatomy01:21

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...
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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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Reticular Dermis01:15

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The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
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Dermis
The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
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Related Experiment Video

Updated: Dec 7, 2025

Micro-dissection of Enamel Organ from Mandibular Incisor of Rats Exposed to Environmental Toxicants
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Transparent dentin region in the tooth root.

Toshiko Inoue1, Makoto Saito1, Fumio Nishimura1

  • 1Division of Biomaterials and Engineering Department of Conservative Dentistry Showa University School of Dentistry Tokyo Japan.

Clinical Case Reports
|September 28, 2020
PubMed
Summary
This summary is machine-generated.

Aging causes tooth root dentin to become transparent and weaker, increasing fracture risk in older adults. This necessitates modified dental procedures for the elderly.

Keywords:
dentinrootteethtransparent dentin

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Area of Science:

  • Biomaterials Science
  • Gerontology
  • Dental Research

Background:

  • Dentin transparency increases with age, particularly in the tooth root.
  • This age-related change in dentin properties is linked to reduced mechanical strength.
  • Understanding these changes is crucial for geriatric dentistry.

Purpose of the Study:

  • To investigate the implications of age-related dentin transparency on tooth root strength.
  • To explore the relationship between transparent dentin and root fractures in aged individuals.
  • To inform modifications in clinical dental procedures for elderly patients.

Main Methods:

  • Analysis of dentin optical properties and mechanical strength in relation to age.
  • Microscopic examination of root dentin structure in aged teeth.
  • Review of clinical data on root fractures in elderly populations.

Main Results:

  • Transparent root dentin exhibits reduced mechanical strength compared to opaque dentin.
  • Dentin brittleness is a significant factor contributing to root fractures in aged individuals.
  • Age-related changes in dentin significantly impact its structural integrity.

Conclusions:

  • Transparent dentin formation during aging compromises tooth root strength.
  • The increased brittleness of transparent dentin explains higher fracture rates in the elderly.
  • Clinical dental practices must be adapted to account for age-related dentin weakening.