What distinguishes chemical cured composites from light cured composites?

What distinguishes chemical cured composites from light cured composites?

• A. They only require heat to activate
• B. They use a catalyst activated by mixing two pastes
• C. They contain no fillers
• D. They are typically less flexible

Answer: (B)

Chemical cured composites are distinguished by their use of a catalyst system that is activated through the mixing of two pastes. This process occurs when the two components – typically a base and a catalyst – are combined, leading to a chemical reaction that hardens the material. This type of curing relies solely on the chemical reaction between the components rather than an external light source for polymerization. This method is particularly advantageous in certain clinical situations where a light source may not be available or where it is difficult to uniformly expose a composite material to light. The other characteristics of chemical cured composites, such as their potential limitations in working time and resistance to moisture, come from this curing method. In contrast, light cured composites rely on a photoinitiator that is activated by specific wavelengths of light, allowing for more precise control over the curing process and often leading to uniform results. The other options incorrectly describe the properties or activation processes of these materials. For example, chemical cured composites do not use heat for activation and do contain fillers, which serve to enhance their strength and aesthetic properties.

Chemical cured composites are distinguished by their use of a catalyst system that is activated through the mixing of two pastes. This process occurs when the two components – typically a base and a catalyst – are combined, leading to a chemical reaction that hardens the material. This type of curing relies solely on the chemical reaction between the components rather than an external light source for polymerization.

This method is particularly advantageous in certain clinical situations where a light source may not be available or where it is difficult to uniformly expose a composite material to light. The other characteristics of chemical cured composites, such as their potential limitations in working time and resistance to moisture, come from this curing method.

In contrast, light cured composites rely on a photoinitiator that is activated by specific wavelengths of light, allowing for more precise control over the curing process and often leading to uniform results. The other options incorrectly describe the properties or activation processes of these materials. For example, chemical cured composites do not use heat for activation and do contain fillers, which serve to enhance their strength and aesthetic properties.