If there is 1 mm of space between upper and lower molars in complete dentures, what corrective action should be taken?

When there is 1 mm of space between the upper and lower molars in complete dentures, the most appropriate corrective action is to reduce the tuberosity. This is because excessive space between the upper and lower molars can indicate a misalignment in the occlusion or an improper fit, often due to an overgrown tuberosity or residual ridge. Reducing the tuberosity helps in achieving a better fit and alignment between the dentures, which in turn helps to stabilize the occlusion.

Adjusting the occlusion focuses on balancing the bite relationship between the upper and lower sets of teeth without necessarily addressing the structural issues that may cause the spacing. Performing a denture reline is generally indicated when there is an issue with the fit due to changes in the shape of the alveolar ridge rather than the presence of excess space caused by bony structures. Increasing the bite height may exacerbate occlusal issues and is not typically a solution for correcting spacing discrepancies unless there is a specific need based on the patient's occlusion needs.

Thus, reducing the tuberosity is a targeted corrective measure to address the underlying issue leading to the 1 mm space, making it a more effective and necessary step in the fabrication and adjustment of complete dentures.