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Clinical Note

Effect of static force on bone conduction hearing thresholds and comfort

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Pages 632-635 | Received 30 Nov 2010, Accepted 24 Dec 2010, Published online: 21 Apr 2011
 

Abstract

Abstract

Objective: To assess the effect of the static force of a bone vibrator on the results of bone conduction (BC) threshold measurements and comfort. Design: BC thresholds were determined for 40 participants using the standardized P-3333 headband and a leather adjustable headstrap with variable static forces (2.4, 3.4, 4.4, 5.4 N). Comfort ratings were examined using a five-point Likert scale. Results: Mean BC thresholds were within ± 2 dB across all conditions; differences may be considered small enough to be clinically insignificant. Participants experienced significantly greater discomfort with the P-3333 versus the adjustable headstrap. The mean static force of the P-3333 varied considerably and was higher in situ than the calibration standard of 5.4 N. Conclusions: The results suggest that future revisions of relevant international and national standards should address the use of an adjustable headstrap and a static force less than 5.4 N.

Sumario

Objetivo: Evaluar el efecto de la fuerza estática de un vibrador óseo en los resultados de las mediciones de los umbrales por conducción ósea (BC) y sobre la comodidad. Diseño: Se determinaron los umbrales BC en 40 participantes utilizando la diadema estandarizada P-3333 y una banda cefálica ajustable con fuerzas estáticas variables (2.4, 3.4, 4.4, 5.4 N). La calificación de la comodidad se examinó con una escala Likert de cinco puntos. Resultados: Los umbrales promedio estuvieron en los ± 2dB a través de todas las condiciones; las diferencias pueden ser consideradas lo suficientemente pequeñas para ser clínicamente insignificantes. Los participantes experimentaron una molestia mucho mayor con la P-3333 que con la banda cefálica ajustable. La fuerza estática de la P-3333 varió considerablemente y fue mayor in situ que en el estándar de calibración de 5.4 N. Conclusiones: Los resultados sugieren que las revisiones de los estándares internacionales y nacionales deben dirigir la atención al uso de las bandas cefálicas ajustables y una fuerza estática menor que 5.4 N.

Acknowledgements

The authors thank Dr. Stephen Pallett for assistance.

Declaration of interest: The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.

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