PROVIDER AND ASSISTANT MOBILE CHAIRS

Provider and assistant mobile chairs play an important role in the practice of dentistry because of techniques that require both the provider and assistant to work from seated positions. The doctor's or

Figure 11-14.\Basic bur head shapes and sizes.

provider's chair is designed with an adjustable backrest (fig. 11-15). The assistant's 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.\Provider's mobile chair.

Figure 11-16.\Assistant's 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, because doing so would keep the locking mechanism from holding its adjusted position. Be sure to routinely clean the chair seat and backrest or armrest since these areas often become soiled.