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Related Concept Videos

Teeth01:15

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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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Tooth Anatomy01:21

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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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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Bone Formation by Intramembranous Ossification01:29

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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
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Sutures of the Skull01:22

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The human skull is composed of several bones that come together to protect the brain and support the structures of the face. The junctions where these bones meet are called sutures.
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Structural Joints: Fibrous Joints01:03

Structural Joints: Fibrous Joints

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Fibrous joints are a type of joint where the bones are connected by fibrous connective tissue. These joints provide stability and minimal to no movement between the articulating bones. There are three types of fibrous joints.
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Related Experiment Video

Updated: Feb 25, 2026

Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model
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Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model

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Association between Tooth Agenesis and Skeletal Malocclusions.

Ana Maria Guerra Costa1, Mariana Trevizan1, Mírian Aiko Nakane Matsumoto1

  • 1Department of Pediatric Dentistry, Ribeirão Preto Dental School, USP - University of São Paulo, Ribeirão Preto, São PauloBrazil.

Journal of Oral & Maxillofacial Research
|August 10, 2017
PubMed
Summary

Tooth agenesis, the congenital absence of teeth, is linked to specific skeletal malocclusions. Patients with missing teeth showed smaller A point-nasion-B point angles, indicating a correlation between dental and skeletal development.

Keywords:
anodontiabirth defectstooth abnormalities

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Area of Science:

  • Dentistry
  • Orthodontics
  • Human Genetics

Background:

  • Tooth agenesis is a common developmental anomaly.
  • Skeletal malocclusions affect facial structure and dental alignment.
  • Understanding their association aids orthodontic diagnosis and treatment planning.

Purpose of the Study:

  • To investigate the relationship between tooth agenesis and skeletal malocclusions.
  • To analyze cephalometric data in non-syndromic orthodontic patients with and without tooth agenesis.

Main Methods:

  • Retrospective analysis of 348 orthodontic patient records.
  • Evaluation of panoramic radiographs for tooth agenesis.
  • Cephalometric analysis of lateral radiographs to determine skeletal classes (I, II, III) using the A point-nasion-B point (ANB) angle.

Main Results:

  • Tooth agenesis was present in 28 of 348 patients.
  • The A point-nasion-B point (ANB) angle was significantly smaller in patients with tooth agenesis (1.66°) compared to those without (2.86°).
  • A negative correlation was found between the ANB angle and the number of congenitally missing teeth.

Conclusions:

  • Tooth agenesis is associated with a reduced ANB angle, suggesting a link to specific skeletal patterns.
  • The findings highlight the importance of considering dental anomalies in the diagnosis of skeletal malocclusions.