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D-head (clipped head) nail – a common or box nail with part of the head removed for some pneumatic nail guns; Double-ended nail – a rare type of nail with points on both ends and the "head" in the middle for joining boards together. See this patent. Similar to a dowel nail but with a head on the shank. Double-headed (duplex, formwork ...
The suffix "-flexus / -flexid" (upper molar / lower molar) is used for the open valleys in the occlusal surfaces of the hypsodont teeth. When this valleys are enclosed, they are called fossetes/fossetids (upper molar / lower molar). Sometimes they are used also for the folds of the teeth, although the proper name for the folds is sulcus (pl ...
Primary teeth start to form in the development of the embryo between the sixth and eighth weeks, and permanent teeth begin to form in the twentieth week. [25] If teeth do not start to develop at or near these times, they will not develop at all. A significant amount of research has focused on determining the processes that initiate tooth ...
In some cases, these anomalies may take the form of the appearance of extra teeth. Evolutionarily, hyperdontia can be seen as a result of genetic variation. Although extra teeth may be a maladaptive trait in modern humans due to potential dental issues and crowding, whether individuals with supernumerary teeth have a benefit or disadvantage is ...
The universal numbering system uses a unique letter or number for each tooth. The uppercase letters A through T are used for primary teeth and the numbers 1 - 32 are used for permanent teeth. The tooth designated "1" is the right maxillary third molar and the count continues along the upper teeth to the left side.
Within ground sections of teeth, prisms appear to be twisted and interwoven around each other at the cusps. Such allows teeth to be able to resist strong masticatory forces without fracturing, with literature showing teeth being able to resist forces up to 20-30 pounds per tooth [10]. This part of the enamel is called Gnarled enamel [11].
Double teeth can cause other dental problems such as crowding, ectopic eruption of adjacent teeth, gum issues, cavities, malocclusion, poor esthetics, and more. [1] Treatment depends on whether the tooth is a primary or permanent tooth, the degree of fusion, and its functional & esthetic impact.
Double head may refer to: Doublehead (1744–1807), one of the most feared warriors of the Cherokees during the Cherokee–American wars; Double heading, the practice of using two locomotives to pull a train; Band head § Double head, a spectral band with two heads; Polycephaly, the condition of having more than one head.