Stretching exercises for dentists and the dental team.
Scientific proof that the Bambach really works!
Assessment of dental student posture in two seating conditions using RULA methodology – a pilot study
A. Gandavadi,1 J. R. E. Ramsay2 and F. J. T. Burke3
A between-subject experimental design was selected.
The study was undertaken at the University of Birmingham School of Dentistry in 2006.
Subjects (materials) and methods
Sixty second year dental students at the University of Birmingham who were attending their first classes in the phantom head laboratory were randomly selected and allocated to two different seats (30 Bambach Saddle Seats and 30 conventional seats). Students were trained in the use of the seats. After ten weeks, the students were observed, photographs were taken by the researcher and these were assessed using Rapid Upper Limb Assessment (RULA).
Main outcome measures
The posture of the students was assessed using the RULA. Each student was given a risk score. A Mann Whitney test was used for statistical analysis.
The results indicated that the students using the conventional seat recorded significantly higher risk scores (p <0.05) when compared with the students using Bambach Saddle Seat, suggesting an improvement in posture when using the Bambach Saddle Seat.
RULA has identified that dental students using a Bambach Saddle Seat were able to maintain an acceptable working posture during simulated dental treatment and this seating may reduce the development of workrelated musculoskeletal disorders.
Electromyographic study of the dynamic sitting position suitable for dentists
M.Th. VERKINDERE, C LACOMB, and J.PH. LODTER.
Faculty of Dental Surgery. University of Toulouse 3, Chemin des Maraichers. 31400 Toulouse, France.
The classic sitting position, adopted by all dentists, has an iatrogenic (or accidentally harmful) effect on the spinal column. Dynamic sitting positions appear to be less iatrogenic.
One of the chairs offered to us most recently is the Bambach Saddle Seat. Using global electromyography, we studied the muscular activity that it causes and compared it to that required by the classic sitting position. The subjects in this experiment were 18 dentists who simulated conservatory dental work on a lower premolar. The muscles we examined were the trapezium, the large right-hand abdominal muscle, the spinal muscles, and the quadriceps. The results obtained showed a slightly superior muscular activity on this chair, principally in the dorsal muscles, but no radical change in the posture compared with the classic sitting position. The higher sitting position of this chair, the stability of its scat, and its great mobility appears to be less iatrogenic than other sitting positions.
Effect of two seating positions on upper limb function in normal subjects
Gandavadi A, Ramsay J, James G (2005) Int J Ther Rehabil 12(11)
Many upper limb functions are performed in a sitting position. However, if seating is inadequate and poorly designed, back pain and reduced upper limb control may result. This study investigates pelvic posture and performance in an upper limb task. In total,15 normal healthy volunteers (aged 18–30 years) were seated in posterior and anterior pelvic tilt positions and performed a simple upper limb task. The parameters measured were electromyography of the lumbar paravertebral muscles, time taken to complete the task and the task error rate.The data were analysed by repeated measures analysis of variance (ANOVA) and post-hoc t tests. The results indicate that, when seated in an anterior pelvic tilt position, the error rate decreased (P=0.013) and the electrical activity increased (P=0.008). The time taken to complete the task was not significantly different. Since the error rate decreased when seated in the anterior pelvic tilt position, it might be concluded that this posture facilitated task skill. It is suggested that the increase in electrical activity is related to the increased load on the lumbar muscles in maintaining the posture. This study’s generalizability is limited, with small subject numbers and the use of a non-functional task. It is, however, a beginning in addressing the interrelationship between the seated posture and skilled upper limb performance.
Dying for a seat
Chris Langham starts a new six-part series that looks at the history, evolution and physical dangers inherent in one of our most common items of furniture. The chair!
Assessment of dental student posture in two seating conditions.
Gandavadi A, JRE Ramsay, FJT Burke,
University of Birmingham, 1. School of Health Sciences, 2. School of Dentistry
The research was approved by the ethics committee of the School of Health Sciences. The study was outlined to all the year 2 dental students at the University of Birmingham who were attending their first classes in the phantom head laboratory. Their consent for participation in the study was requested. Sixty students were randomly selected for the study. 30 students were given Bambach Saddle Seats and 30 students were given conventional seats.
The results indicated that there was a significant difference between the RULA scores for the two seats used and indicated that the students using conventional seats recorded significantly higher risk scores compared to the students using the bambach Saddle Seat, suggesting an improvement in posture when using the bambach Saddle Seat.