What can cause micro leakage in dental restorations?

Micro leakage in dental restorations is primarily influenced by the thermal expansion and contraction of materials used in the restoration process. When temperature changes occur, materials can expand or contract at different rates due to their inherent thermal properties. This differential movement can create gaps between the dental restoration and the natural tooth structure, leading to micro leakage.

Micro leakage itself can result in various complications, including the potential for bacterial infiltration, which can contribute to secondary caries or sensitivity issues for the patient. Therefore, the understanding of temperature changes as a cause of micro leakage is critical for maintaining the integrity of dental restorations and ensuring patient comfort.

While other options may relate to dental procedures and materials broadly, they do not directly lead to micro leakage in the same way that temperature fluctuations inherently disrupt the seal created by the restorative materials.