Which condition might indicate that a dental restoration is failing?

Increased sensitivity to temperature is a clear indicator that a dental restoration may be failing. This sensitivity suggests that there may be an issue with the seal of the restoration, allowing thermal stimuli to reach the pulp of the tooth. It can also imply that there are microleakages or deterioration of the materials that make up the restoration. This condition can arise from a variety of factors, such as wear over time, breakdown of the bonding agents, or even secondary caries.

In contrast, maintained esthetic appearance, absence of marginal discoloration, and smooth surface upon palpation are generally signs that indicate a restoration is functioning well. These factors suggest that the restoration appears healthy, fits properly, and has not developed any visible flaws or looseness that could lead to failure. Therefore, increased sensitivity to temperature is the most telling sign of potential issues with a restoration.