ERGONOMICS IN A SCALER DR. CONSOLATA PEJRONE
of design-test-revise allowed to make evidence on key factors like reduction of pinch force of the fingers around the handle and pressure on the tooth. Harmony™ are the first scalers with a science-based design. LOOK AND TRY The Harmony™ Handle is perfect for a modified pen grasp: the tapered shape invites and improves the coupling of the finger pads during high force pulling motion required for scaling. Moreover the difference of diameter along the handle allows the grasp to change position while adapting the working end to the different areas of the mouth: another hint to distress the pinching too forcefully the instrument and avoid cramps and rigidity. Adaptation to all hand sizes is also facilitated by the recessed double-helix knurling pattern surface texture assuring a safe
29.75
61.59 51.7%
63.29 52.2%
63.13 52.9%
86.19 65.5%
Baseline
and easy rolling of the instrument between the fingers. The final results are very encouraging: there is a good combination of decrease pinch force against the handle (65% compared to other ergonomic scaler design), minor pressure needed against the tooth (37% less compared to other leading scaler handle design) that results in significant and precious patient comfort without sacrificing effectiveness. The combination of these obtained features with the EverEdge™ 2.0 Technology of outstanding sharpness of the cutting edge (72% sharper than the next leading competitor) gives evidence to the efficiency, comfort and ergonomic qualities in one instrument.
Hu-Friedy Harmony™ Scaler Handle
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REFERENCES 1. Netanely S, Luria S, Langer D. Musculoskeletal disorders among dental hygienists and students of dental hygiene. Int J Dent Hyg. 2020; 18(2): 210-216. 2. Hayes M, Cockrell D, Smith DR. A systematic review of musculo skeletaldisorders among dental professionals. Int J Dent Hyg. 2009; 7(3): 159-65. 3. Lalumandier JA, McPhee SD. Prevalence and risk factors of hand problems and carpal tunnel syndrome among dental hygienists. J Dent Hyg. 2001; 75(2):130-4. 4. Rempel D, Lee DL, Dawson K, Loomer P. The effect of periodontal curette handle weight and diameter on arm pain: a four-month randomized controlled trial. J Am Dent Assoc. 2012 Oct; 143(10):1105-13. 5. Mulimani P, Hoe VC, Hayes MJ, Idiculla JJ, Abas AB, Karanth L. Ergonomic interventions for preventing musculoskeletal disorders in dental care practitioners. Cochrane Database Syst Rev. 2018; 10(10):CD011261. 6. Dong H, Barr A, Loomer P, Laroche C, Young E, Rempel D. The effects of periodontal instrument handle design on hand muscle load and pinch force. J Am Dent Assoc. 2006; 137(8):1123-30. 7. Dong H, Loomer P, Barr A, Laroche C, Young E, Rempel D. The effect of tool handle shape on hand nuscle load and pinch force in a simulated dental scaling task. Appl Ergon. 2007; 38(5); 525-531. 8. Michalak-Turcotte C. Controlling dental hygiene work-related musculoskeletal disorders: the ergonomic process. J Dent Hyg. 2000; 74(1):41-48. 9. Villanueva A, Dong H, Rempel D. A biomechanical analysis of applied pinch force during periodontal scaling. J Biomech. 2007; 40(9): 1910-15. 10. Hayes MJ. The effect of stainless steel and silicone instruments on hand comfort and strength: a pilot study. J Dent Hyg. 2017; 91(2):40-44. 11. Villa-Forte A. Musculoskeletal pain. Merck Manual Consumer Version Updated Feb 2021.Accessed Jan 7, 2022.https//www.merckmanuals.com/home/bone, joint,-and-muscle-disorders/ symptoms-of-musculoskeletal-disorders/musculoskeletal-pain.
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