Working Time Definition — NDEB AFK MCQ
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Correct answer: B — The time from start of mixing until the material can no longer be manipulated and placed effectively
Working time is the period from the start of mixing until the material becomes too stiff or viscous to be manipulated, placed, and adapted effectively. It must be long enough for the clinician to complete the intended procedure (mixing, loading, seating). Working time is influenced by temperature (increased temperature shortens working time), mixing technique, and material composition. For example, zinc phosphate cement working time is extended by mixing on a cooled glass slab over a large area.
Reference: Anusavice – Phillips' Science of Dental Materials, 13th ed., 2022