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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.
Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

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.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
Psychosexual Stages of Personality: Oral01:16

Psychosexual Stages of Personality: Oral

The oral stage is the initial phase of Sigmund Freud's theory of psychosexual development, occurring from birth to approximately 12 to 18 months. During this period, the infant's mouth serves as the primary source of pleasure, with actions such as sucking, chewing, biting, and drinking playing a crucial role in reducing tension. These activities are essential not only for nourishment but also for the infant's psychological and emotional satisfaction.
Weaning, typically occurring around the age...
Development of the Oral Microbiota01:28

Development of the Oral Microbiota

The establishment of the oral microbiome begins before birth, challenging the long-held belief that the fetal oral cavity is sterile. The presence of oral microbes such as Streptococcus and Fusobacterium in amniotic fluid suggests that microbial exposure may occur in utero, potentially through translocation from the maternal oral or gastrointestinal tract. This early colonization primes the neonatal immune system and sets the stage for subsequent microbial succession. Maternal health,...

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Same author

[Breast feeding and systemic blood pressure in infants].

Revista de investigacion clinica; organo del Hospital de Enfermedades de la Nutricion·2012
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Updated: Jun 14, 2026

The Slice Culture Method for Following Development of Tooth Germs In Explant Culture
07:47

The Slice Culture Method for Following Development of Tooth Germs In Explant Culture

Published on: November 13, 2013

[Agenesis in permanent dentition].

Raul Diaz-Perez1, Ruben A Echaverry-Navarrete

  • 1Facultad de Odontología, Universidad Nacional Autónoma de México. drraul@prodigy.net.mx

Revista De Salud Publica (Bogota, Colombia)
|April 10, 2010
PubMed
Summary

Dental agenesis, the congenital absence of teeth, affects 26% of the permanent dentition. A family history of this condition significantly increases the risk, while gender shows no association with its prevalence.

Area of Science:

  • Dentistry
  • Human Genetics
  • Oral Health

Context:

  • Dental agenesis is a common developmental anomaly affecting permanent dentition.
  • Understanding its prevalence and associated risk factors is crucial for diagnosis and management.
  • Previous studies have explored various factors, but the role of family history requires further investigation.

Purpose:

  • To determine the prevalence of dental agenesis in a permanent dentition cohort.
  • To investigate the association between dental agenesis and sociodemographic variables, including gender and family history.

Summary:

  • A study of 112 patients over 13 years old revealed a 26% prevalence of dental agenesis.
  • Third molars were most commonly affected (21.4%), followed by other teeth (4.5%).

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Isolation of Epithelial Cells from Human Dental Follicle
04:07

Isolation of Epithelial Cells from Human Dental Follicle

Published on: November 5, 2021

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Last Updated: Jun 14, 2026

The Slice Culture Method for Following Development of Tooth Germs In Explant Culture
07:47

The Slice Culture Method for Following Development of Tooth Germs In Explant Culture

Published on: November 13, 2013

Isolation of Epithelial Cells from Human Dental Follicle
04:07

Isolation of Epithelial Cells from Human Dental Follicle

Published on: November 5, 2021

  • While gender was independent of dental agenesis, a positive family history and family line showed a significant association (p<0.001).

    • Impact:

    • This research highlights the significant genetic component of dental agenesis.
    • Findings can inform genetic counseling and early diagnostic strategies for patients with a family history.
    • Establishes a basis for future research into the specific genetic pathways involved in tooth development.