Excessive trituration is discouraged because it can result in which of the following?

Excessive trituration of dental materials, particularly for amalgams or composites, can lead to a weakened restoration. When the materials are over-mixed or triturated, it can compromise the integrity of the bonds and the physical properties of the material. Specifically, excessive trituration can introduce too much heat or create an unbalanced mix that alters the desired strength and durability of the restoration. This can result in weakened mechanical properties, which ultimately can affect the longevity and reliability of the restoration once placed in the patient's mouth.

Inadequate matrix formation and setting too slowly are potential consequences related to other factors in dental material manipulation, but they are not the primary outcomes of excessive trituration. Therefore, while those issues might arise from different aspects of the mixing or setting process, the main concern with excessive trituration directly relates to the resultant weakened restoration.