Variability of Musculoskeletal Strain on Dentists: An Electromyographic and Goniometric Study

• Autorzy: Blanc D. , Farre P. , Hamel O.
• Języki publikacji: EN

Abstrakty

EN

Introduction. Dentists and hygienists are strongly affected by musculoskeletal disorders (MSDs). As workstation concepts are supported by subjective arguments only, the aim of this study was to use objective measurements to compare the variability of strain in various concepts: a dental chair equipped with a cart or an over-the-patient delivery system without an assistant, and Dr Daryl Beach’s concept with an assistant. Methods. Goniometric and electromyographic recordings were made on 8 subjects, during a scaling operation. The electrical activity of their trapezius and lumbar muscles was compared, as were their cervical and lumbar ranges of motion. Results. The results showed that there was a wide variability depending on the workstation. However, the Beach concept tended to reduce physical strain on most parameters: duration of left lumbar muscle activity (2% compared to 15% of time spent in >10% maximal voluntary contraction, MVC), time spent in cervical side bending (4% compared to 30%), cervical flexion of >20° (9% compared to 40%), and left trapezius activity (9% of time spent >10% MVC compared to 28%). Conclusion. Practitioners and students should adjust their workstations to reduce the prevalence of MSDs.

Słowa kluczowe

EN

dental workstation; electromyography; goniometry; musculoskeletal disorders

PL

elektromiografia; zaburzenia układu mięśniowo-szkieletowego; stomatolog

• Wydawca: Taylor & Francis
• Czasopismo: International Journal of Occupational Safety and Ergonomics
• Rocznik: 2014
• Tom: Vol. 20, No. 2
• Strony: 295--307
• Opis fizyczny: Bibliogr. 25 poz., rys., tab.

Twórcy

autor

Blanc D.

• Department of Public Health, Universite Paul Sabatier, Toulouse, France

autor

Farre P.

• Department of Public Health, Universite Paul Sabatier, Toulouse, France

autor

Hamel O.

• Department of Public Health, Universite Paul Sabatier, Toulouse, France

Bibliografia

• 1.Hayes M, Cockrell D, Smith DR. A systematic review of musculoskeletal disorders among dental professionals. Int J Dent Hyg. 2009;7(3):159–65.
• 2.Dong H, Barr A, Loomer P, Rempel D. The effect of finger rest position on hand muscle load and pinch force in simulated dental hygiene work. J Dent Educ. 2005; 69(4):453–60. Retrieved March 5, 2014, from: http://www.jdentaled.org/content/69/4/453.long.
• 3.Rolander B, Jonker D, Karsznia A, Oberg T. Evaluation of muscular activity, local muscular fatigue, and muscular rest patterns among dentists. Acta Odontol Scand. 2005;63(4):189–95.
• 4.Oberg T, Karsznia A, Sandsjö L, Kadefors R. Work load, fatigue, and pause patterns in clinical dental hygiene. J Dent Hyg. 1995; 69(5):223–9.
• 5.Milerad E, Ericson MO, Nisell R, Kilbom A. An electromyographic study of dental work. Ergonomics. 1991;34(7):953–62.
• 6.Åkesson I, Balogh I, Hansson GÅ. Physical workload in neck, shoulders and wrists/hands in dental hygienists during a workday. Appl Ergon. 2012;43(4):803–11.
• 7.Åkesson I, Hansson GÅ, Balogh I, Moritz U, Skerfving S. Quantifying work load in neck, shoulders and wrists in female dentists. Int Arch Occup Environ Health. 1997;69(6):461–74.
• 8.Finsen L, Christensen H, Bakke M. Musculoskeletal disorders among dentists and variation in dental work. Appl Ergon. 1998; 29(2):119–25.
• 9.Fauchard P. Le chirurgien-dentiste ou traité des dents [The dental surgeon, about teeth]. 1746. Retrieved March 5, 2014, from: http://gallica.bnf.fr/ark:/12148/bpt6k106170j.
• 10.Société française d’histoire de l’art dentaire. Histoire de l’aménagement opératoire du cabinet dentaire [The history of the dental office layout]. 2008. Retrieved March 5, 2014, from: http://www.bium.univparis5.fr/sfhad/cab_txt23.htm.
• 11.Kilpatrick HC. Work simplification in dental practice: applied time and motion studies. Philadelphia, PA, USA: Saunders; 1964.
• 12.Neddermeyer W. The Beach system: physiological basis for work positions. Rev Odontostomatol (Paris). 1980;9(4):53–7. In French.
• 13.Smith CA, Sommerich CM, Mirka GA, George MC. An investigation of ergonomic interventions in dental hygiene work. Appl Ergon. 2002;33(2):175–84.
• 14.Kadefors R, Forsman M, Zoéga B, Herberts P. Recruitment of low threshold motor-units in the trapezius muscle in different static arm positions. Ergonomics. 1999;42(2):359–75.
• 15.McAtamney L, Corlett EN. RULA: a survey method for the investigation of work-related upper limb disorders. Appl Ergon. 1993;24(2):91–9.
• 16.Chaffin DB. Localized muscle fatigue—definition and measurement. J Occup Med. 1973;15(4):346–54.
• 17.Kilbom A, Persson I, Jonsson B. Risk factors for work related disorders of the neck and shoulder—with special emphasis on working postures and movements. In: Corlett EN, Wilson JR, Manenica J, editors. The ergonomics of working posture. London, UK: Taylor & Francis; 1986. p. 44–53.
• 18.Kilbom Å, Persson I, Jonsson B. Disorders of the cervicobrachial region among female workers in the electronics industry. Int J Ind Ergon. 1986;1(1):37–47.
• 19.Drury CG. A biomechanical evaluation of the repetitive motion injury potential of industrial jobs. Semin Occup Med. 1987;2(1):41–9.
• 20.Grandjean E. Fitting the task to the man: a textbook of occupational ergonomics. 4th ed. London, UK: Taylor & Francis; 1988.
• 21.Grandjean E, Hünting W, Pidermann M. VDT workstation design: preferred settings and their effects. Hum Factors. 1983;25(2):161–75.
• 22.Kapandji IA. Physiologie articulaire [Articular physiology]. Vol. 3, Tronc et rachis [Trunk and spine]. Paris, France: Maloine; 2007.
• 23.Sjøgaard G. Savard G, Juel C. Muscle blood flow during isometric activity and its relation to muscle fatigue. Eur J Appl Physiol. 1988;57(3):327–35.
• 24.Verkindere MT, Lacombe C, Lodter JP. Electromyographic study of the dynamic sitting position suitable for dentists [Extract translated from French]. L’Information Dentaire. 1998;80(12):911–6. Retrieved March 5, 2014, from: http://www.healthydesign.com/products/bambach/BSSdownloads/electromyographic-study-ofdentists.pdf.
• 25.Blanc D. Astreinte musculosquelettique chez le chirurgien dentiste: etude electromyographique et goniométrique [Musculoskeletal strain on dental surgeons: an electromyographic and goniometric study] [doctoral dissertation]. Toulouse, France: Université Paul Sabatier-Toulouse III; 2013. In French, with an abstract in English. Retrieved March 5, 2014, from: http://thesesante.ups-tlse.fr/113/1/2013TOU33034.pdf.