The high predominance of pain and discomfort in the back, neck and shoulders (Green and Brown, 1963 apud Langosky, 2001) have contributed to dental surgeon to adopt, at the end of the 60's, the sitting posture as its working posture. However, it was presumed that if the professional stopped working standing up, it would be smaller the overload on locomotive system. However, the painful symptoms are still being complaint (Rundcrantz,
1991 apud Langosky, 2001).