Ergonomics is a 'hot' topic in the dental practice. As we all know, dentists and nurses spend significant amounts of time in working sessions during which it is common for them to assume positions that are not correct for their physical well-being. Muscle tensions, unnatural torsions, excessive loads: we are all too familiar with these consequences. Of a different origin, though equally important for work quality, is the stress felt by the patient lying in the chair. If he is uncomfortable, if he does not feel at ease, he becomes more impatient and less cooperative, making the work of the dental team difficult.