Sealants can vary in which of the following aspects?

Sealants can indeed vary significantly in the method of polymerization. This aspect refers to the chemical process by which the sealant material hardens after it is applied to the tooth surface. There are different types of polymerization methods, including chemical (self-cured) and light-cured systems. The choice of method can impact the sealant's setting time, durability, and ease of application, making it a critical aspect of sealant variation that affects performance.

Other aspects, like color, effectiveness, and brand name, while they do play a role in the selection of sealants, do not encompass the same fundamental differences in the functionality and application process of the material as the method of polymerization does. Color primarily affects aesthetics but does not influence the sealant's protective qualities. Degree of effectiveness can vary as well, but this is influenced by more factors than just the resin type, including application technique and patient factors. Brand name may indicate different manufacturers, but the core differentiating factor in sealant behavior and performance lies in how the material is polymerized.