Biomechanical study of dentists posture when using a conventional chair versus a saddle-seat chair

Abstract

a b s t r a c t a r t i c l e i n f oObjectives: This study aimed to provide information about dentists' body posture on a conventional chair vs. a saddle-seat chair while performing dental procedures. Information was obtained using inertial motion sensors.Methods: Twenty-four dentists performed a Class I cavity in the upper right and left first molars and lower right and left first molars. Nineteen dentists worked on a conventional chair (Group I), and five on a saddle-seat chair (Group II). Kinematic measurements of the whole body were registered using Xsens ® MVN BIOMECH.Results: Both groups worked with a pronounced forward head position. Lateral flexion of the head was similar between groups, and head rotation was more evident in Group II. Regarding trunk position, Group II showed less forward leaning and lateral flexion than Group I. Arm elevation of both the left and right arms was more pronounced in Group I during all dental tasks. However, Group I showed better left-hand posture. Anterior rotation of the pelvis was most evident while working on the lower jaw in Group II.Conclusions: This study suggests that the saddle seat improves the working posture regarding pelvis rotation, arm elevation, and trunk flexion. Further studies should include objective measurements of the dentists' posture during dental work using different dental equipment, to understand the role of ergonomics in dentistry. Métodos: Vinte e quatro dentistas realizaram uma cavidade tipo I (oclusal) no primeiro molar de cada quadrante dentário. Dezanove dentistas trabalharam numa cadeira convencional (Grupo I) e cinco dentistas numa cadeira ergonómica (Grupo II). Com recurso aos sensores Xsens ® MVN BIOMECH registou-se as posições de cada participante. Conclusões: Este estudo sugere que o banco em sela melhora a postura do médico dentista no que diz respeito à rotação da pélvis, elevação dos braços e flexão do tronco. Investigações futuras devem incluir medidas objetivas da postura do dentista durante a atividade clínica com recurso a diferentes equipamentos dentários, no sentido de compreender o papel da ergonomia na medicina dentária. Resultados

Digitalization of Musculoskeletal Risk Assessment in a Robotic-Assisted Assembly Workstation

“…The system uses a hand coordinate system meaning. For example, in "Wrist Flexion/Extension", a positive value indicates wrist flexion, whereas a negative value indicates wrist extension [32,33]. For this reason, the wrist angular variation was analyzed across the assembly tasks and for each participant, segregating the values according to the joint movements mentioned.…”

International Symposium on Occupational Safety and Hygiene: Proceedings Book of the SHO2019

“…Quando se trata dos quadrantes da arcada inferior, estes fletem lateralmente a cabeça para o lado esquerdo (Figura 2). Os resultados obtidos no que diz respeito ao movimento de flexão/extensão e flexão lateral da cabeça estão de acordo com os resultados obtidos por outros autores (Silva, 2018;Silva et al, 2017).…”

“…Os segmentos corporais mais afetados são o pescoço e o tronco com uma prevalência de dor músculo-esquelética que se situa entre 19,8% e 85% e 36,3% e 60,1%, respetivamente (Hayes et al, 2009). A elevada prevalência de sintomas resulta de uma excessiva flexão anterior do pescoço e excessiva flexão anterior e lateral do tronco durante a realização dos tratamentos dentários que exigem uma boa visualização do campo de trabalho, a cavidade oral (Chaikumarn, 2005;Silva et al, 2017;Wazzan, Almas, Shethri, & Qahtani, 2001).…”

The Combination of Different Ergonomic Supports during Dental Procedures Reduces the Muscle Activity of the Neck and Shoulder

“…The increasingly frequent use of ergonomic supports to improve the dental workplace has led to the emergence of studies that demonstrate the utility of ergonomic stools with lumbar support [13,14,16] or magnification lenses [12,15,17,18,19]. Multiple outcome measures have been used, highlighting pain scales and functional assessments (Quebec or DASH) [19], shoulder/cervical ROM [18,19], fatigue perception [20,21], motion analysis [15,22,23], postural assessment [13,15,17,24] and muscle activity [14,15,16].…”