Which of the following is an ABSOLUTE contraindication to dental implant placement? (Choose the item that is NOT a contraindication — i.e., the exception is the implantable patient.) Identify the condition that is NOT an absolute contraindication:

Correct answer: B. A prosthetic (mitral) heart valve

• A. Uncontrolled diabetes impairs healing/osseointegration and is a contraindication until controlled.
• B. Correct. A prosthetic heart valve is NOT a contraindication to implants — it simply may require antibiotic prophylaxis per AHA guidelines. The other three are genuine (absolute/serious) contraindications.
• C. A recent MI is a strong contraindication to elective surgery.
• D. Active IV bisphosphonate therapy markedly increases MRONJ risk and contraindicates elective implant surgery.