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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.
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...
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Related Experiment Video

Updated: Oct 3, 2025

Scanning Electron Microscopic Evaluation of Surface Defects of Remover Retreatment File After Single and Multiple Uses
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Evolution and development: engine-driven endodontic rotary nickel-titanium instruments.

Yuhong Liang1, Lin Yue2

  • 1Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing, China.

International Journal of Oral Science
|February 19, 2022
PubMed
Summary
This summary is machine-generated.

Engine-driven nickel-titanium (NiTi) endodontic files have evolved significantly over 20 years, improving root canal shaping efficiency and resistance to torsional failure. Selecting the appropriate NiTi system is crucial for successful clinical outcomes.

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Area of Science:

  • Dentistry
  • Materials Science
  • Endodontics

Background:

  • Engine-driven nickel-titanium (NiTi) files are essential for root canal cleaning and shaping.
  • Understanding NiTi file properties is key to their effective use.

Purpose of the Study:

  • To review the evolution of engine-driven NiTi endodontic files over the past 20 years.
  • To analyze advancements in design, manufacturing, and motion modes.
  • To discuss factors influencing the selection of NiTi systems.

Main Methods:

  • Review of scientific literature on NiTi endodontic files.
  • Analysis of crystallographic composition, cutting edge design, and separation types.
  • Examination of geometric design, surface treatments (electropolishing, thermal treatment), metallurgy, and motion modes.
  • Discussion of torsional failure resistance.

Main Results:

  • NiTi file technology has advanced through multiple generations, enhancing shaping efficiency.
  • Improvements in geometric design, surface treatments, and metallurgy have increased file durability.
  • Various motion modes have been developed to reduce the risk of cyclic fatigue and torsional failure.
  • A balance between shaping efficacy and instrument resistance has been achieved.

Conclusions:

  • Continuous innovation in NiTi file systems offers improved performance in endodontic procedures.
  • Selection of the optimal NiTi system depends on root canal anatomy, instrument characteristics, and operator experience.
  • These advancements contribute to better clinical outcomes in root canal therapy.