Journal
APPLIED ERGONOMICS
Volume 56, Issue -, Pages 220-226Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apergo.2016.02.014
Keywords
Dental ergonomics; Posture; Sitting; Muscle activity
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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. (C) 2016 Elsevier Ltd. All rights reserved.
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