Ceramic crown being biocompatible means that the material is

• A. Bioinert
• B. Not releasing toxic agents
• C. No bioactivity is necessary
• D. All of the above

Answer: (D)

Biocompatibility means the material can stay in the mouth without causing harm to tissues or releasing toxic substances. For a ceramic crown, this typically means it is bioinert—showing minimal interaction with surrounding tissues—so it won’t provoke inflammation or irritation. It also must not leach toxic agents into saliva or dentin. Bioactivity, the ability to bond or interact chemically with tissue, is not necessary for a crown to be biocompatible; a crown can be safe and accepted by the body without needing to form such bonds. Putting these together, a biocompatible ceramic crown can be bioinert, must not release toxins, and does not need to be bioactive, which is why all of these aspects fit the concept.