Which In Vitro Test type assesses genetic material changes in a cell?

• A. Cytotoxicity (or cell growth)
• B. Mutagenesis assays
• C. Metabolic or other cell function
• D. In Vivo Tests

Answer: (B)

Mutagenesis assays are aimed at detecting changes in the genetic material itself. They look for mutations—permanent alterations in the DNA sequence—that can be passed to daughter cells. In vitro, these tests use a system with a selectable marker or reporter so that a mutation produces a measurable signal, such as restored growth or a color change. This focus on heritable genetic changes is what makes mutagenesis assays the right choice for assessing genotoxic potential of substances, including dental materials. Other in vitro tests measure different things: cytotoxicity checks if cells survive and grow, metabolic or other cell function tests examine enzyme activity or cellular processes, and in vivo tests study effects in whole organisms. A classic example of an in vitro mutagenicity assay is the Ames test, which detects mutations that restore the ability to grow in a mutant strain.