If a PFM crown is mobile and the gums are red, what could be a likely reason?

A mobile porcelain-fused-to-metal (PFM) crown, combined with red gums, suggests a few important clinical considerations, including the possibility of hyper occlusion. Hyper occlusion occurs when a tooth or dental restoration is positioned too high in relation to the opposing teeth, leading to excess pressure during biting or chewing. This excessive force can cause the crown to become loose and may also contribute to inflammation in the surrounding gum tissue, resulting in redness and potential tenderness.

In this scenario, a misalignment in occlusion can compromise the stability of the crown as well as the health of the periodontal tissues, leading to both mobility of the crown and inflammation of the gums. Addressing hyper occlusion would involve adjusting the occlusal surfaces to ensure that the forces of biting are evenly distributed, thereby improving both the condition of the crown and the health of the gums.

Understanding this connection is critical for proper diagnosis and treatment, as it emphasizes the importance of occlusal adjustments in preserving dental restorations and periodontal health.