This surgery results in the root and the crown cut lengthwise and removed.

• A. Hemisection
• B. Root amputation
• C. Extraction
• D. Apicoectomy

Answer: (A)

Hemisection is the procedure where a multi-rooted tooth is sectioned vertically through the furcation so that one root and the corresponding portion of the crown can be removed, leaving the other root and crown segment intact. This matches the description of cutting the root and crown lengthwise and removing one portion. It’s done to salvage the remaining root structure when decay, periodontal involvement, or furcation problems make restoration of the entire tooth impractical.

In contrast, removing just a root while keeping the crown describes a root amputation, not a full sectioning of the tooth. Extraction would remove the entire tooth, and an apicoectomy targets the root tip, not the crown-root division.