Dental Frequency of ultrasonic preparation is: A 20,000 - 25000 cycles/ sec B 5000 - 15000 cycles/ sec C 30000 - 40000 cycles/ sec D 1500 - 6500 cycles/ sec 💡 Explanation Frequency of ultrasonic preparation is: ✓ Correct Answer: A. 20,000 - 25000 cycles/ sec