MediPosture strongly recommends this dental chair Knee Lift and ICORE Memory Backrest Combo as the most-effective approach to addressing patient back distress in the dental chair. The dental chair Knee Lift and ICORE Memory Backrest combo work together; lifting even more weight than a lumbar cushion can do alone. This added release of pressure allows the surrounding area muscles to relax further for a more “weightless” feeling in the dental chair.