How is the depth of curing and shade of the material related?: (A) Lighter shade requires more curing, (B) Darker shade requires less curing, (C) Lighter shade requires less curing, (D) Both 1 and 2
Answer is C. Optical modifiers affect light transmission through a composite. Thus, darker shades and greater opacities have a decreased depth of light-curing ability and require either an increased exposure time or a thinner layer when cured. Studies have shown that for optimal polymerization, resins with darker shades and opacifiers should be placed in thinner layers.
Phillip’s 12th edition page 291