A-dec 500 Dental Stools. Ultimate Comfort and Support. The A-dec 500 doctor's and assistant's stools offer a dynamic seating system that conforms and moves with the body. With years of research behind it, the innovative A-dec 500 stool is strategically engineered to help you feel your best, so you can perform your best. Dynamic Support Three layers of flexible seating conform to your every shift and move. Four unique performance zones allow good blood flow to the legs, while setting up the lower lumbar for a proper, healthy torso posture all day long. Healthy Seated Posture Our dynamic seating system helps your spine maintain a healthy S-shape. This ergonomic seated position lets you enjoy both comfort and improved performance. Easy Adjustment Correct posture reduces stress on joints and spine and provides better circulation for your feet and extremities. The A-dec 500 stool’s easy-to-follow numbered paddles encourage customized adjustments—especially important if there are multiple users. Take a look at the A-dec Stools Brochure