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Mandibular prognathism is a potentially disfiguring genetic disorder where the lower jaw outgrows the upper, resulting in an extended chin and a crossbite. In both humans and animals, it can be the result of inbreeding. [10]
Craniofacial and other features of LFS include: maxillary hypoplasia (underdevelopment of the upper jaw bone), [9] a small mandible (lower jaw bone) and receding chin, [3] [17] a high-arched palate (the roof of the mouth), with crowding and misalignment of the upper teeth; [5] [7] macrocephaly (enlarged skull) with a prominent forehead, [3] [9 ...
When a jaw is malrotated around the transverse facial axis, it is said to have abnormal pitch. When malrotated around the anteroposterior axis, the jaw has an abnormal roll, a condition also known as cant. Finally, when a jaw is malrotated around the vertical axis, it has abnormal yaw. It can occur in maxilla and/or mandible and could result ...
Example of a cleft chin (William McKinley) Human jaw front view. The terms cleft chin, [15] chin cleft, [15] [16] dimple chin, [17] [18] or chin dimple [15] refer to a dimple on the chin. It is a Y-shaped fissure on the chin with an underlying bony peculiarity. [19]
Micrognathism is a condition where the jaw is undersized. It is also sometimes called mandibular hypoplasia. [2] It is common in infants, [3] [4] but is usually self-corrected during growth, due to the jaws' increasing in size. It may be a cause of abnormal tooth alignment and in severe cases can hamper feeding. [5]
In jawed vertebrates, the mandible (from the Latin mandibula, 'for chewing'), lower jaw, or jawbone is a bone that makes up the lower – and typically more mobile – component of the mouth (the upper jaw being known as the maxilla). The jawbone is the skull's only movable, posable bone, sharing joints with the cranium's temporal bones.
The speculation around Efron's jaw first started in April 2021 when fans noticed his jaw looked different when he appeared in a Facebook Watch video with Bill Nye.
Additionally, the evolution and reduction in the jaw has left little room for the third molar, or wisdom tooth, to form. As a result, many individuals choose to remove them through surgery. One of the defining features among Homo sapiens is the presence of a chin. A protruding chin was absent in archaic hominids, as well as Neanderthals ...
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