The water-to-powder ratio of an adult mandibular impression is:

The correct water-to-powder ratio for an adult mandibular impression is established as 2:2. This specific ratio ensures the optimal consistency of the impression material, allowing it to flow properly into the details of the mandibular anatomy while providing sufficient rigidity once set. Achieving the right consistency is critical for capturing accurate impressions, as too much water can compromise the integrity and detail of the final impression, making it less effective for creating dental prostheses.

While alternative ratios may theoretically produce a usable material, they may not provide the same level of detail or stability necessary for high-quality impressions. Maintaining the recommended ratio is essential for achieving adequate results in clinical practice, particularly in procedures involving further restorations or appliance fabrications.