Usage can use what volunteers?

• A. Animal
• B. Human
• C. Both Animal and Human
• D. None

Answer: (C)

Biocompatibility testing for dental materials relies on data from both animal and human subjects to understand safety and performance. Animal studies provide in vivo information about how the material interacts with living tissues, including local tissue responses, inflammation, potential toxic effects, and systemic exposure, helping identify hazards and establish safe exposure levels before human use. Human clinical studies with volunteers then confirm tolerability and real-world behavior in the oral environment, capturing data on irritation, allergenicity, corrosion or wear, release of constituents, and patient-reported outcomes. Together, these approaches build a comprehensive safety profile: animal data offers mechanistic insight and risk thresholds, while human data verifies actual biocompatibility under clinical conditions. Regulatory and ethical safeguards apply: animal work is governed by welfare standards, and human studies require informed consent and ethics oversight. In practice, researchers also use in vitro tests to screen materials and reduce animal use, aligning with the goal of patient safety while advancing knowledge. The combination of animal and human volunteering data is why both are used when evaluating dental materials.