What is a disadvantage of using composite materials as core materials?

Using composite materials as core materials does present challenges, particularly regarding their performance in wet environments. One significant disadvantage is their poor dimensional stability when exposed to moisture. Composite materials can absorb water, which may lead to swelling or changes in shape that can compromise the integrity of a restoration. This instability can affect the fit of the restoration and potentially lead to issues such as microleakage, further increasing the risk of secondary caries and reducing the longevity of the dental restoration.

While other factors like compressive strength and adhesion might be concerns in different contexts, the dimensional changes in the presence of moisture are particularly impactful since they can directly affect the function and longevity of the restoration in a clinical setting. Aesthetic qualities, while important, are less of a concern in the context of core materials as these are typically not visible. Thus, the issues related to moisture exposure highlight the unique considerations that must be taken into account when utilizing composite materials in dental applications.