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"Dental chair" is a colloquial term, "dental treatment chair" is a professional component, while a dental chair unit is the complete dental treatment equipment system.

• Dental unit: The most common and standard professional term. • Dental chair: More colloquial, emphasizing the chair itself. • Dental chair unit: Emphasizes the integrated system structure. • Operatory unit: Emphasizes the core operational unit within the treatment space.

1. Different Definitions • A dental treatment chair is a positional support device. • A dental chair unit is a complete dental treatment system. 2. Different Structural Complexities • A dental treatment chair has a relatively simple structure. • A dental chair unit has a highly integrated structure.