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Dr. Elena Márquez was a new graduate, proud of her diploma but terrified of her first solo root canal. She knew the theory: pulp chambers, root apexes, the curve of the mesial root. But knowing a map and navigating a storm are different things.

Anatomy is not a suggestion. It is the law. And Figún & Garino’s PDF is the law book every clinical dentist must keep close.

Her patient, an elderly carpenter named Señor Ríos, sat in the chair with a fractured molar. “Fix it straight, Doctora,” he said. “I need to bite into an apple, not just soup.”

Using a dental operating microscope, she searched for that extra canal. Her heart pounded. The X-ray shadow was faint. But because Figún & Garino had described exactly where to look (2 mm below the cervical line, slightly lingual), she found it—a tiny, calcified fourth canal hiding like a secret door.