Dental In general, hand sharpening of instruments with unmounted stones is preferable to sharpening by motor – driven mounted stones because unmouted stones A have a finer grain B are less likely to alter the bevel C are easier to sterilize D wear away less of the instrument surface 💡 Explanation In general, hand sharpening of instruments with unmounted stones is preferable to sharpening by motor - driven mounted stones because unmouted stones ✓ Correct Answer: D. wear away less of the instrument surface