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Related Concept Videos

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...
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.
Functional Classification of Joints01:09

Functional Classification of Joints

Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
Synarthrosis
An immobile...
Spanning Openings in Brick Walls01:20

Spanning Openings in Brick Walls

In brick wall construction, supporting structures are crucial for openings like windows and doors to maintain the integrity and support the weight of the wall above. These supports include lintels, corbels, and arches, each serving specific structural purposes.
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Structural Classification of Joints01:20

Structural Classification of Joints

Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
A fibrous joint is where the adjacent bones are united by fibrous connective...
Classification of Bones01:18

Classification of Bones

The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
Long and Short Bones
The appendicular skeleton, particularly the upper and lower limbs, is primarily made of long and short bones. The long...

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Related Experiment Video

Updated: May 31, 2026

Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires
08:46

Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires

Published on: July 24, 2018

Method to classify dental arch forms.

Shin-Jae Lee1, Sungim Lee, Johan Lim

  • 1Department of Orthodontics, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Korea.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|July 5, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a new method to classify dental arch forms in individuals with normal occlusion, identifying three distinct types. This classification aids in orthodontic treatment planning and the selection of preformed arch forms.

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Last Updated: May 31, 2026

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Area of Science:

  • Dentistry
  • Orthodontics
  • Biometrics

Background:

  • Classifying dental arch forms is crucial for orthodontic treatment.
  • Existing methods may lack precision or clinical applicability.

Purpose of the Study:

  • To propose a novel, clinically applicable method for classifying dental arch forms in subjects with normal occlusion.
  • To ensure both goodness of fit and practical application in orthodontics.

Main Methods:

  • Selected 306 young adults with normal occlusion from a larger cohort.
  • Defined dental arch form distance using the area between arches based on 14 reference points.
  • Employed partitioning around medoids clustering and the silhouette method for classification, measuring various dental and arch parameters.

Main Results:

  • Identified three distinct dental arch forms based on the proposed classification method.
  • Observed specific distributions in cross-classifications of maxillary and mandibular arch forms.
  • Demonstrated significant differences in tooth size, arch dimensions, and tooth inclinations among the identified arch forms.

Conclusions:

  • The proposed method effectively classifies dental arch forms using distance measures and clustering, controlling for extremes without bias.
  • This classification system has potential clinical applications in orthodontics, particularly for determining the shape and number of preformed orthodontic arch forms.