Dental For a dental hand instrument with a formula of 10-8.5-8-14, the number 10 refers to A The width of the blade in tenths of a millimeter. B The primary cutting edge angle in centigrades. C The blade length in millimeters. D The blade angle in centigrades. 💡 Explanation For a dental hand instrument with a formula of 10-8.5-8-14, the number 10 refers to ✓ Correct Answer: A. The width of the blade in tenths of a millimeter.