Profile: Napa Dental specializes in dental equipment. Our dental staff seating and replacement patient chair cushions are available in a variety of styles & colors. Our classic stools with a lumbar support features a fully adjustable system of which one lever can automatically position the seat tilt and lumbar support for personal comfort & the second lever controls the height of the lumbar support. The lumbar support cushion is narrow and fits into the lower back area, thereby supporting the lower back continuously.