Before sending the reline impression for a distal extension base RPD to the lab, which condition is an exception?

The condition regarding the increase in vertical dimension of the occlusion with supporting teeth stands out as an exception when preparing a reline impression for a distal extension base removable partial denture (RPD).

When relining a distal extension denture, it is critical that the relationship between the denture base and the supporting teeth remains consistent. Stability and proper occlusal relationships are essential for the success of the RPD. Increasing the vertical dimension may alter the alignment and relationship of the occlusal plane with the opposing dentition, potentially leading to issues with bite and aesthetics.

In contrast, the other conditions mentioned are essential considerations before sending a reline impression to the lab. The partial denture framework must maintain its relationship with the supporting teeth to ensure that the reline will not adversely affect fit and function. Stable tissue support is paramount for proper function, as any instability can lead to discomfort or a lack of retention in the denture. Lastly, maintaining the same occlusal relationship with opposing teeth is crucial for functional harmony and the prevention of occlusal interferences. Each of these conditions contributes to the success of the RPD, making an alteration in vertical dimension an exception rather than a standard practice.