Influence of different stool types on muscle activity and lumbar posture among dentists during a simulated dental screening task. (September 2016) - De Bruyne, Mieke A.A.
Abstract: Whereas in the past dental stools typically facilitated a 90° hip angle, a number of currently available alternative designs allow for a more extended hip posture. The present study investigated the influence of different stool types on muscle activity and lumbar posture. Twenty five participants completed a simulated dental procedure on a standard stool, a saddle and the Ghopec. The latter stool comprises a seat pan consisting of a horizontal rear part for the pelvis and an inclinable sloping down front part for the upper legs, with a vertically and horizontally adjustable back rest. Lumbar posture was most close to neutral on the Ghopec, whereas sitting on a standard/saddle stool resulted in more flexed/extended postures respectively. Sitting with a 90° angle (standard stool) resulted in higher activation of back muscles while sitting with a 125° angle (saddle and Ghopec) activated abdominal muscles more, although less in the presence of a backrest (Ghopec). To maintain neutral posture during dental screening, the Ghopec is considered the most suitable design for the tasks undertaken. Highlights: The influence of different stool types in dentists is presented. Classical dental stools facilitate a 90° hip angle during sitting. Saddle and Ghopec stools allow for a greater hip angle. Sitting with a 125° angle activated abdominal muscles more and back muscles less. The Ghopec is considered the most suitable stool to maintain neutral posture.