Mechanistic Modeling of Hydraulic Energy Transmission Technology of an Improved Dental Patient Chair Design

Abstract

This work focused on mechanistic modeling of hydraulic technology of an improved dental chair design. ISO 6385 standard for P(M)95 patient were basis for system parameters, and fathom masses between 60kg-93kg, corresponding to DINED 2003 mass of patients, produced total load on the pantograph. The force exerted by the lower limb of the dentist is an ergonomic stressor that was experimentally studied using Pascal’s law of the hydraulic system. Methodology adopted was mechanistic modeling technique. The results indicated that pedal force of 0.1375kN elevated trimmed chair (dead load) of 0.55kN, while pedal force of 211N to 277N were required to recline between 60kg-93kg masses on the system. It infers that the pump has a mechanical advantage of approximately 5, with displacement volume, 11.7825cm-2, that produced a platform displacement of 3. 75cm during a 15cm hydraulic pedal travel stroke. The experimental results corroborated Pascal’s laws and is has technological significance on carrier-long musculoskeletal disorders (MSDs) of lower limb among dental practitioners.