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Prevalence and Risk Factors of Neck Musculoskeletal Disorders among Dental Hygienist 
Int J Clin Prev Dent 2018;14(3):190-196
Published online September 30, 2018
© 2018 International Journal of Clinical Preventive Dentistry.

Ka-Yeon Lee1, Jong-Ae Chun2

1Department of Dental Hygiene, Ulsan College, Ulsan, 2Department of Dental Hygiene, Kyungwoon University, Gumi, Korea
Correspondence to: Jong-Ae Chun Department of Dental Hygiene, Kyungwoon University, 730 Gangdong-ro, Sandong-myeon, Gumi 39160, Korea. Tel: +82-54-479-4066, Fax: +82-54-479-4066, E-mail: belllove01@hanmail.net https://orcid.org/0000-0002-5656-5807
Received August 27, 2018; Revised September 17, 2018; Accepted September 18, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Objective: The purpose of this study was to investigate the prevalence and risk factors of neck musculoskeletal disorders in dental hygienists. 
Methods: A questionnaire survey was conducted on 266 dental hygienists currently working at the dental clinics in Busan. 
Results: Work intensity of the subjected dental hygienists considered as high with over 8 daily working hours (59.0%), six weekly working days (57.9%), and executing night duty (77.8%). Among 256 cases excluding 10 subjects who had the past history, 180 cases (70.3%) had subjective pain and 80 cases (44.4%) of the 180 cases had pain sustained over one week, and the prevalence of neck musculoskeletal symptoms according to National Institute of Occupation Safe for Health /Korean Occupational Safety and Health Agency criteria was 124 cases (48.4%). The prevalence were significantly higher in case of over 8 daily working hours (53.7%) than under 8 hours (41.3%) (p=0.065), over 45 degree neck bending (55.0%) than under 45 degree (35.3%) (p=0.005), both neck inclined or tilted (63.8%) than either one (p=0.024), and more fixed posture (53.3%) than rather free (39.6%) (p=0.048). As result of multiple logistic regression analysis, over 45 degree neck flexion (odds ratio [OR]=1.87, 95% confidence interval [CI]=1.06-3.30) and fixed posture (OR=1.93, 95% CI=1.01-3.68) significantly affected the neck musculoskeletal disorders. 
Conclusion: In summary, in order to decrease the risk of neck musculoskeletal disorders among dental hygienist, correct the habitual neck bending and tilting behaviors would be strengthened and a proper guide that efficiently release the state of bending and keeping fixed state would be needed. 
Keywords : dental hygienist, musculoskeletal diseases, neck, prevalence, risk factor


September 2018, 14 (3)