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Hydraulic dental chairs are dental chairs that use a hydraulic system to raise, lower, and adjust the chair's position. Electric dental chairs are currently the more widely used type of dental chair. They use a motor-driven system, along with a control panel and electronic logic, to achieve chair height adjustment, backrest adjustment, and multi-angle positioning.

From a professional perspective, the correct answer is: dental chairs can be both electric and hydraulic. • If referring to the current mainstream configuration: Most dental chairs are electric. • If considering historical and structural classification: Not all dental chairs are electric.