Which statement about ultrathin metal matrices for posterior Class II composites is false?

Ultrathin metal matrices are designed to create optimal conditions for restoring posterior Class II cavities. One of the advantages of using ultrathin metal matrices is that they are crafted to allow easy placement and adaptation to the tooth's surface, which helps to produce tight interproximal contacts and superior proximal contours. Because of their thin profile, these matrices can adapt well to the contours of the teeth, facilitating better contact formation and esthetics.

The statement regarding the complication of matrix placement is not accurate when considering the intended design and use of ultrathin metal matrices. Clinicians often find that these matrices simplify the process of placement, especially in tight interproximal spaces, rather than complicating it. The use of light-reflecting wedges can further enhance the adaptation and effectiveness of these matrices, improving the overall restoration outcomes.

In essence, the primary goal of ultrathin matrices is to facilitate the creation of ideal interproximal contacts and contours, so asserting that they complicate matrix placement contradicts their purpose and established benefits in clinical practice.