Figure 11-14.Basic bur head shapes and sizes.
providers chair is designed with an adjustable
backrest (fig. 11-15). The assistants chair on the other
hand, has an adjustable armrest that wraps around to
the front of the chair (fig. 11-16). Chairs for both the
provider and the assistant should be well-padded and
comfortable. They both must have adjustable seat
height, as well as a broad base to give stability.
Normally, chairs with at least four to five casters are
preferred. The chair should have a foot support ring so
that the users can keep their feet parallel to the floor,
thereby maintaining comfort and proper posture.
Figure 11-15.Providers mobile chair.
Figure 11-16.Assistants mobile chair.
Level I maintenance on mobile chairs consists of
making adjustments, lubricating the caster bearings,
and cleaning. The adjustments involve seat height and
backrest or armrest positions. Lubricate the caster
bearings with light-weight machine oil monthly.
Never lubricate the single shaft on these chairs,