What is the normal clearance angle for paraffin and frozen tissue sections?

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Multiple Choice

What is the normal clearance angle for paraffin and frozen tissue sections?

Clearance angle is the small tilt between the knife edge and the block that helps the blade slice without rubbing. For paraffin-embedded tissue, the block is firm, so a modest angle of about 2–4 degrees gives clean ribbons with minimal blade contact that could compress the tissue. Frozen sections are softer, so a larger clearance angle of about 5–7 degrees keeps the blade from dragging and reduces tearing and chatter. If the angle is too small, you get compression artifacts from the blade rubbing; if it’s too large, ribbons become uneven and edges may tear. The described ranges—2–4 degrees for paraffin and 5–7 degrees for frozen sections—best balance smooth sectioning with quality ribbons.

Clearance angle is the small tilt between the knife edge and the block that helps the blade slice without rubbing. For paraffin-embedded tissue, the block is firm, so a modest angle of about 2–4 degrees gives clean ribbons with minimal blade contact that could compress the tissue. Frozen sections are softer, so a larger clearance angle of about 5–7 degrees keeps the blade from dragging and reduces tearing and chatter. If the angle is too small, you get compression artifacts from the blade rubbing; if it’s too large, ribbons become uneven and edges may tear. The described ranges—2–4 degrees for paraffin and 5–7 degrees for frozen sections—best balance smooth sectioning with quality ribbons.

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