Kellert M, Solomon C, Chalfin H
Columbia University School of Dental and Oral Surgery.
N Y State Dent J. 1994 Jun-Jul;60(6):25-8.
Ultrasonic devices are capable of generating better apical preparations than rotary instruments with less sacrifice of root structure. Regardless of the technique used, good lighting and magnification are necessary to insure an adequate apical preparation.
与旋转器械相比，超声设备能够在较少牺牲牙根结构的情况下制备出更好的根尖区预备形态。无论采用何种技术，良好的照明和放大设备对于确保充分的根尖区预备都是必要的。
