Which of the following is a consequence of not addressing hyper occlusion in a PFM?

The consequence of not addressing hyper occlusion in a PFM (Porcelain-Fused-to-Metal crown) primarily relates to the mobility of the tooth. Hyper occlusion means that the tooth is under excessive biting pressure, which can lead to increased stress on the periodontal structures. This stress may cause the supporting bone and gum tissue to become compromised, potentially resulting in tooth mobility.

When a tooth is not appropriately aligned with its opposing tooth or when it's bearing more occlusal force than it should, it can lead to an inflammatory response in the periodontal tissues. This inflammation can then progress to a condition known as periodontal disease, where the attachment of the tooth becomes weaker, leading to increased mobility.

In contrast, the options related to aesthetics, sensitivity, or gum health would not be the main direct consequences of hyper occlusion. Improved aesthetics would actually be unrelated, as hyper occlusion typically worsens the overall dental health situation rather than improving it. Similarly, reduction in sensitivity is not a direct outcome of hyper occlusion, as sensitivity issues can be associated with other factors like enamel loss or exposure of dentin. Lastly, there is indeed an impact on gum health; prolonged hyper occlusion can lead to the deterioration of gum health rather than having '