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Males tend to have larger teeth than females, [1] and tooth size also varies by race. [1] Abnormal tooth size is defined by some as when the dimensions are more than 2 standard deviations from the average. [1] Microdontia is when the teeth are abnormally small, and macrodontia is when the teeth are abnormally large.
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.
This is important as the plaque that attaches to the surface of the tooth has bacteria that have the ability to cause caries (decay) on the tooth surface. It is recommended to brush children's teeth twice daily using a soft bristled, age and size appropriate toothbrush and if indicated age-appropriate amount of fluoridated toothpaste. [11]
Data derived from principal component analysis of radiographic images show that children with mild hypodontia may display significant increase of the interincisal angle and decrease in the maxillary and mandibular incisor angles. Cephalometric tracing is commonly used to study a patient's dentofacial proportions in the craniofacial complex.
Teeth affected by regional odontodysplasia nevAmelogenesis imperfecta is an autosomal dominant disease characterized by a defect in dental enamel formation. Teeth are often free of enamel, small, misshapen, and tinted brown. The cause of these deformities is due to a mutation in enamel in expression.
Trauma, reactions to foreign bodies, or toxic reactions can also contribute to this non-plaque-induced gingivitis. Furthermore, genetics can play a significant role. Specifically, hereditary gingival fibromatosis is known to cause non-plaque-induced gingival lesions. However, sometimes, there is no specific cause for this form of gingival disease.
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The genetic cause of ED lies in mutations, or changes, in certain genes that play an essential role in forming ectodermal structures. These genes are part of signalling pathways—most notably, the EDA/NF-kappaB pathway—which guide the development of hair, skin, nails, teeth, and glands during embryonic growth.