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Full trisomy 9 is a rare and fatal chromosomal disorder caused by having three copies of chromosome number 9.It can be a viable condition if the trisomic component affects only part of the cells of the body or in cases of partial trisomy of the short arm (trisomy 9p) in which cells have a normal set of two entire chromosomes 9 plus part of a third copy of the short arm ("p") of the chromosome.
Individuals with PKS present prenatally or at birth with multiple birth defects.These defects include: brain atrophy, agenesis of the corpus callosum, polymicrogyria of the brain, and/or spot calcifications in the brain's lateral sulcus; deafness and/or blindness; autonomic nervous system dysfunctions such as anhidrosis, hypohidrosis, and/or episodic spells of hyperventilation interspersed ...
Turner's hypoplasia or Turner's tooth is a presentation of enamel hypoplasia that normally affects only a single tooth. Its causes can be the same as other forms of enamel hypoplasia, but it is most commonly associated with trauma to a primary maxillary central incisor and the subsequent developmental disturbance of the underlying permanent ...
Tooth pathology is any condition of the teeth that can be congenital or acquired. Sometimes a congenital tooth disease is called a tooth abnormality.These are among the most common diseases in humans [1] The prevention, diagnosis, treatment and rehabilitation of these diseases are the base to the dentistry profession, in which are dentists and dental hygienists, and its sub-specialties, such ...
However, there is a trisomy 9p-related congenital disorder which has only 3 copies of this genetic material due an abnormal chromosome 12 containing duplicate copies rather than a single copy of some genetic material. These individuals have trisomy 9p; they have birth defects similar to, but less severe than, those in tetrasomy 9p. [26]
One of the most common types, pitting enamel hypoplasia (PEH), ranges from small circular pinpricks to larger irregular depressions. [2] Pits also vary in how they occur on a tooth surface, some forming rows and others more randomly scattered. [3] PEH can be associated with other types of hypoplasia, but it is often the only defect observed. [4]
Partial collarbones may cause nerve damage symptoms and therefore have to be removed by surgery. The mandible is prognathic due to hypoplasia of maxilla (micrognathism) and other facial bones. [11] A soft spot or larger soft area in the top of the head where the fontanelle failed to close, or the fontanelle closes late.
Anodontia is the congenital absence of teeth and can occur in some or all teeth; whereas partial anodontia (or hypodontia), involves two dentitions or only teeth of the permanent dentition (Dorland's 1998). Approximately 1% of the population has oligodontia. [1]