Document Type : Original Article

Authors

1 Kerman Dental and Oral Diseases Research Center, Kerman University of Medical Sciences,

2 Department of Oral Medicine, School of Dental Kerman, Kerman University of Medical Sciences

3 Kerman Dental and Oral Diseases Research Center, Kerman University of Medical Sciences, Departments of Oral Medicine, School of Dental Kerman, Kerman University of Medical Sciences, Kerman Social Determinants on Oral Health Research Center, Kerman University of Medical Sciences, Kerman, Iran

Abstract

BACKGROUND: Dynamic and static activities in dentistry cause musculoskeletal disorders, but
dental students do not have sufficient awareness about the effects of ergonomic factors on their
health. The aim of this study was to investigate ergonomic factors that cause pain muscle in dental
students in Kerman Medical University, Iran.
METHODS: This cross‑sectional analysis study was carried out on dental students of the 3rd, 4th, 5th,
and 6th year, in clinical practice in the School of Dentistry, Kerman University of Medical Sciences.
A convenient sample of 199 students who met the inclusion criteria was selected and those willing
to participate signed an informed consent form. Data were collected by means of a structured
questionnaire for ergonomic factors and the presence of pain. The variables evaluated were pain,
affected zones, gender, postures, and work environment.
RESULTS: The present research work reveals that over 69% of the dental students complained
of pain in at least one part of their body. Most individuals suffered from hand and elbow (23%) and
head (19%) pain. The clinical areas where more pain was found were endodontics and pedodontics.
Furthermore, it was found that a high percentage of students usually worked with their legs slightly
separated, with the sole of the feet resting on the stool when working. The presence of muscular
pain was higher in males in this study. Furthermore, there was a statistically significant relationship
with the final Rapid Entire Body Assessment score in different body parts and the participants’
demographic data (sex, age, weight, height, sports, and smoking).
CONCLUSIONS: The results of this study showed that the students’ sitting positions and working
environments need to be improved and it seems more training is necessary in this field.

Keywords

1. Nordin M, Andersson GB, Pope MH. Musculoskeletal Disorder
in the Workplace: Principles and Practice. New York Mosby‑Year
Book, Inc.; 1997. p. 24‑5.
2. Rundcrantz BL. Pain and discomfort in the musculoskeletal
system among dentists. Swed Dent J Suppl 1991;76:1‑02.
3. Diaz‑Caballero AJ, Gómez‑Palencia IP, Díaz‑Cárdenas S.
Ergonomic factors that cause the presence of pain muscle
in students of dentistry. Med Oral Patol Oral Cir Bucal
2010;15:e906‑11.
4. Marshall ED, Duncombe LM, Robinson RQ, Kilbreath SL.
Musculoskeletal symptoms in new south wales dentists. Aust
Dent J 1997;42:240‑6.
5. Biller FE. The occupational hazards in dental practice. Oral Hyg
1946;36:1194‑201.
6. Health and Wellness. Available from: http://www.ADA.
org. [Last retrieved on December 2013]
7. A Resource for Ergonomic Design is Oriented toward Those
Concerned with Ergonomic Standards in the Field of Dentistry.
Available from: http://www.designbyfeel.com. [Last retrieved
on 2009 Feb 26].
8. Valachi B, Valachi K. Preventing musculoskeletal disorders in
clinical dentistry: Strategies to address the mechanisms leading
to musculoskeletal disorders. J Am Dent Assoc 2003;134:1604‑12.
9. Bernard BP. Muscoskeletal Disorders and Workplace Factors.
Columbia Parkway.National Institute for Occupational Safety
and Helath (NIOSH); 1997. p. 34.
10. Varmazyar S, Amini M, Kiafar S. Ergonomic evaluation
of work conditions in Qazvin dentists and its association
with musculoskeletal disorders using REBA method. JIDA
2012;24:182‑7.
11. Saremi M. Assessment of Musculoskeletal Disorders among
Dentistry of Shahed University, Using REBA Method and
Provide Appropriate Corrective Methods. Occupational Health
Field Master’s. [Thesis]. Tehran: Faculty of Medical Sciences of
University Tarbiat Modarres; 2003, No 49130; 2003.
12. Dargahi H, Saraji J, SadrJ, Sadri G. Ergonomics in dentistry. JDM
2009;22:199‑207.
13. Nasle Seraji J. Ergonomic evaluation of working conditions dental
practitioner’s careers city of Birjand method (REBA). J Dent
Tehran Univ Med Sci 2005;18:61‑7.
14. Ahmadi Motemayel F, Abdolsamadi HR, Roshanaei G, Jalilian S.
Prevalence of musculoskeletal disorders among Hamadan general
dental practitioners. Sci J Hamadan Univ Med Sci 2012;19:61‑6.
15. Mojabi B. Investigation neck, back and shoulders pains and
ergonomics factors among general dentists of Qazvin University
of Medical Sciences. Iran Ergonom 2007;2:25‑3.
16. Sim J, Lacey RJ, Lewis M. The impact of workplace risk factors on
the occurrence of neck and upper limb pain: A general population
study. BMC Public Health 2006;6:234.
17. Beach JC, DeBiase CB. Assessment of ergonomic education in
dental hygiene curricula. J Dent Educ 1998;62:421‑5.
18. Rising DW, Bennett BC, Hursh K, Plesh O. Reports of body pain
in a dental student population. J Am Dent Assoc 2005;136:81‑6.
19. Yaghobee S, Esmaeili V. Evaluation of the effect of the ergonomic
principles’ instructions on the dental students’ postures; an
ergonomic assessment. J Tehran Med Univ 2010;63:121‑7.
20. Thornton LJ, Stuart‑Buttle C, Wyszynski TC, Wilson ER. Physical
and psychosocial stress exposures in US dental schools: The need
for expanded ergonomics training. Appl Ergon 2004;35:153‑7.
21. Rucker LM, Sunell S. Ergonomic risk factors associated with
clinical dentistry. J Calif Dent Assoc 2002;30:139‑48.
22. Bramson JB, Smith S, Romagnoli G. Evaluating dental office
ergonomic. Risk factors and hazards. J Am Dent Assoc
1998;129:174‑83.
23. Caruso CC, Waters TR. A review of work schedule issues and
musculoskeletal disorders with an emphasis on the healthcare
sector. Ind Health 2008;46:523‑34.
24. Sartorio F, Franchignoni F, Ferriero G, Vercelli S, Odescalchi L,
Augusti D, et al. Work‑related musculoskeletal disorders in
dentistry professionals 2. Prevention, ergonomic strategies and
therapeutic programs. G Ital Med Lav Ergon 2005;27:442‑8.
25. Yamalik N. Musculoskeletal disorders (MSDs) and dental practice
Part 2. Risk factors for dentistry, magnitude of the problem,
prevention, and dental ergonomics. Inter Dent J 2007; 57:45‑54.
26. Finkbeiner BL. Selecting equipment for the ergonomic
four‑handed dental practice. J Contemp Dent Pract 2001;2:44‑52.
27. Dehghan CA, Amiri Z, Rabiee M. Prevalence of musculoskeletal
pain among a group of Iranian dentists, (Tehran‑1999). J Dent Sch
2003;21:185‑92.
28. Wogalter MS, Wendy AR. Human Factors Ergonomics. Available
from: http://www.psichi.org. [Last retrieved on 2008 ‑12 March].
29. Lindfors P, von Thiele U, Lundberg U. Work characteristics
and upper extremity disorders in female dental health workers.
J Occup Health 2006;48:192‑7.
30. Alexopoulos EC, Stathi IC, Charizani F. Prevalence of
musculoskeletal disorders in dentists. BMC Musculoskelet Disord
2004;5:16.
31. Moen BE, Bjorvatn K. Musculoskeletal symptoms among dentists
in a dental school. Occup Med (Lond) 1996;46:65‑8.