The best method of checking Zenker fixed tissue for the completeness of decalcification is radiologic examination.

• A. True
• B. False
• C. Chemical testing
• D. Visual inspection

Answer: (B)

The main idea here is how to confirm that decalcification is actually complete. Radiographic (X-ray) examination can show remaining mineralized material, but it isn’t the most reliable or practical way to judge when a Zenker-fixed tissue has finished decalcifying. Small amounts of calcium or irregular decalcification can escape detection on X-rays, and the process can be time-consuming with added radiation exposure. More accurate and objective confirmation comes from chemical testing of the decalcifying solution for calcium ions. If the test shows no calcium ions, decalcification is complete; if calcium ions are still present, decalcification should continue. Visual assessment of softness or transparency is too subjective to be relied upon alone, because tissue hardness can vary and may not reflect complete mineral removal. So, chemical testing of the solution provides a clearer, more dependable indicator of complete decalcification.