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https://ivicdental.com/hydraulic-vs-electric-dental-chair/#:~:text=in%20the%20market.-,Hydraulic%20Dental%20Chairs,operate%20than%20electric%20dental%20chairs.

https://www.reddit.com/r/askscience/comments/up9om/how_do_hydraulic_chairs_work/

https://www.ancar-online.com/en/blog/la-evolucion-del-sillon-dental/

https://collection.sciencemuseumgroup.org.uk/objects/co102142/hydraulic-dental-chair-philadelphia-united-states-1925-1935-hydraulic-dental-chair

https://www.worlifts.co.uk/blog/hydraulic-systems-found-everyday-life/

https://www.hydraproducts.co.uk/Blog/hidden-hydraulics-in-places-you-might-never-expect#:~:text=Dentist%20chairs%20use%20hydraulic%20pumps,work%20on%20the%20same%20principle.

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Dentist chairs use hydraulic pumps to lower and lift the body of the chair still on to alter the angle of the footrest and headrest.

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The first hydraulic dental chair was invented in 1877 by yankee medical practitioner Basil Manly Wilkerson (1842-1910), the chair was easier to regulate than older wood ones, this hydraulic system permits an improved position of the patient’s back throughout interventions and improves operating conditions.

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It uses pumps and valves to manage the dental chair and alter its position, hydraulic dental chairs are significantly quieter to manage than electrical dental chairs.There is a spring spiral at intervals of a gas cylinder, once you press the button, it opens a valve. If you're sitting on the chair once this happens, it lets air out of the cylinder, lowering the chair, but if you're not sitting on the chair, the spring expands the cylinder, drawing any air into it. Once you unleash the button, the valve closes, and thus, the chair stays at height. Two magnet valves are utilized throughout this application to manage the peak of the chair, once a button is ironed on the console, the magnet valve is operated: it intercepts oil at intervals the pump and sends it to the cylinder.The cylinder permits hydraulic energy to become energy so lifting the chair to the required height.

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By: Mariana and Dominique - Y8D