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Height adjustable stools that include a seat and an adjustable backrest appropriate for operator use during long dental procedures; those used by dental assistants also include a long armrest that can be appropriately adjusted. The backrest can also be used as a siderest or abdominal rest. These stools usually include a four- or five-caster base, and some include locking casters and pneumatic mechanisms (possibly foot controlled) for height adjustment. Some dental stools are attached to the dental chair so they can revolve 270 degrees around the chair and retracted close to the chair when not in use.
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