For a Class III furcation involvement on the upper left first molar (through-and-through furcation), all of the following are appropriate treatments EXCEPT:

Correct answer: A. Prophylaxis (routine cleaning only)

• A. Correct. Prophylaxis (routine scaling and polishing) is NOT an adequate treatment for Class III furcation involvement. Class III furcation (through-and-through — probe passes completely through the furcation) requires a definitive treatment due to the severity of attachment loss and poor prognosis with maintenance alone.
• B. Extraction is a valid treatment option for Class III furcation when the tooth cannot be managed by other means.
• C. Tunnel preparation (creating access for brushing through the furcation) is a controversial but recognized management option for Class III furcation in specific situations.
• D. Root resection (removing one or more roots) is an appropriate treatment for Class III furcation when selected roots are viable.