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This article lists different types of expanders that are available for the process of palatal expansion in the field of orthodontics. [1] [2] There can be many types of transverse dimension appliances. These appliances can be used to achieve expansion in the maxillary arch; there are devices for mandibular expansion or lower expansion too. In ...
A palatal expander Upper and lower jaw functional expanders. A palatal expander is a device in the field of orthodontics which is used to widen the upper jaw [1] so that the bottom and upper teeth will fit together better. [2] [3] This is a common orthodontic procedure. The use of an expander is most common in children and adolescents 8–18 ...
In an earlier study published in 2008, [6] the same authors stated that about one-third of the transverse dental expansion obtained with SARPE is lost, however the skeletal expansion remains the same. They also stated that post-surgical relapse with SARPE was similar to the changes in dental arch dimensions after non-surgical rapid palatal ...
Tissue expansion is a common technique used for breast reconstruction. [20] This essentially involves expansion of the breast skin and muscle using a temporary tissue expander. [21] Three to four weeks after the mastectomy, a saline solution will be injected into the expander to gradually fill it. This process is supported by a tiny valve ...
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Hyraxes are well-furred, rotund animals with short tails. [3] Modern hyraxes are typically between 30 and 70 cm (12 and 28 in) in length and weigh between 2 and 5 kg (4 and 11 lb). They are superficially similar to marmots or over-large pikas but are much more closely related to elephants and sirenians. Hyraxes have a life span of nine to 14 years.
Sampling a rock hyrax midden from the Gifberg Pass, Western Cape, South Africa. A rock hyrax midden is a stratified accumulation of fecal pellets and a brown amber-like a urinary product known as hyraceum excreted by the rock hyrax and closely related species.
Climbers sometimes carried only two cylinders each. Four cylinders contained a total of 960 litres of oxygen, which would last for eight hours at the standard rate of 2 litres per minute or seven hours at 2.2 L/min. [32] The attempt on Everest by George Mallory and Andrew Irvine in 1924 was the first summit attempt using oxygen on Everest. [31]
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