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Teeth

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 Anatomy

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.

Nondisjunction

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...

Nondisjunction

Nondisjunction

During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.

The Hyoid Bone

The Hyoid Bone

The hyoid bone is a small U-shaped bone located in the upper neck at the level of the inferior mandible, with its tips pointing posteriorly. It does not directly articulate with any other bone in the body. The hyoid acts as the attachment site for the tongue, the larynx, and the pharynx. It is held in position by a series of small muscles attached from above or below. These muscles help to move the hyoid up/down or forward/back in coordination with movements of the tongue, larynx, and pharynx...

Pleiotropy

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...

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Treatment of Facial Deformities using 3D Planning and Printing of Patient-Specific Implants

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[Dysgnathia complex, a rare deviation].

M J Stuffken¹, D B Tuinzing

¹Uit de afdeling Mond-, Kaak- en Aangezichtschirurgie/Orale Pathologie van het VU medisch centrum (VUmc)/Academisch Centrum Tandheelkunde Amsterdam (ACTA).

Nederlands Tijdschrift Voor Tandheelkunde

|August 9, 2008

Summary

This summary is machine-generated.

Dysgnathia complex, a rare condition with mandibular hypoplasia, limited mouth opening, and ear anomalies, presents diagnostic challenges. This report details a recent case of this uncommon disorder.

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Area of Science:

Medical Genetics
Developmental Biology
Otolaryngology

Background:

Dysgnathia complex is a rare congenital disorder characterized by mandibular hypoplasia or absence (micrognathia/agnathia), microglossia, trismus, and ear anomalies.
Fewer than 21 isolated cases have been documented since 1961, highlighting its rarity and the challenges in diagnosis.
The condition's subtle presentation can be mistaken for other craniofacial developmental syndromes, complicating early identification.

Observation:

A recent case involving a female patient diagnosed with dysgnathia complex is presented.
The diagnostic process for this rare disorder is discussed, emphasizing the difficulties encountered.
Clinical features observed in the presented case align with the established characteristics of dysgnathia complex.

Findings:

The study discusses the diagnostic challenges associated with dysgnathia complex due to its rarity and overlap with other syndromes.
Analysis of the presented case contributes to the limited literature on isolated dysgnathia complex.
The findings underscore the importance of recognizing the specific constellation of symptoms for accurate diagnosis.

Implications:

Increased awareness of dysgnathia complex among clinicians is crucial for timely diagnosis and intervention.
Further research into the etiology and management of dysgnathia complex is warranted.
Accurate diagnosis can lead to more appropriate supportive care and management strategies for affected individuals.