Anatomy & Histology · single question
What is biological width?
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Correct answer: B. JE + connective tissue attachment (~2mm total)
BIOLOGICAL WIDTH = JUNCTIONAL EPITHELIUM (~1mm) + SUPRACRESTAL CONNECTIVE TISSUE ATTACHMENT (~1mm) = approximately 2mm (Gargiulo 1961). This is the zone of tissue directly attached to the tooth above the alveolar bone. The SULCUS (~1mm) is NOT part of the biological width. Total supracrestal tissue = sulcus + biological width ≈ 3mm total. Violation of this zone (crown margins placed too close to bone) causes chronic inflammation. B is correct.
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