In Eisenstein's method, a canal diameter of less than 12 mm is considered?

• A. Normal
• B. Relative stenosis
• C. Absolute stenosis
• D. Mild stenosis

Answer: (B)

In Eisenstein's method, the canal diameter is used to gauge how narrowed the space is. If the measured diameter is below twelve millimeters, that narrowing is labeled relative stenosis. This denotes an intermediate level of narrowing: not normal, but not yet severe or fixed. Relative stenosis reflects a reduced canal size that could become clinically meaningful with additional factors (degenerative changes, dynamic compression, etc.), whereas absolute stenosis would imply more severe, fixed narrowing. The term mild stenosis isn’t used here as the framework specifically separates normal, relative stenosis, and absolute stenosis based on these thresholds.