Which blade has two cutting edges?

The blade that features two cutting edges is the #12D blade. This blade is a surgical incision instrument commonly used in oral and maxillofacial surgery and has a design that includes a curved edge on both sides. The dual cutting edges enable precise incisions and efficient tissue manipulation, making it particularly useful in delicate areas such as the oral cavity.

In contrast, other choices such as the #12 blade typically have a single cutting edge, which is designed for specific types of incisions but lacks the versatility provided by the dual edges of the #12D blade. The #15 and #15C blades are also designed with a single cutting edge but with varying curvature and dimensions which serve other purposes rather than the dual cutting approach found in the #12D. Understanding the unique features of surgical blades and their specific applications can enhance surgical precision and outcomes.