Piezoelectric ultrasonic scaler scaling across the tooth surface could make the surface rough . Surface roughness would increase as the scraping frequency with ultrasonic scaler was increased too . b. After ultrasonic scaling operation the polishing must being carried .

结论：1.压电陶瓷式超声洁治器在 牙面划过会使牙釉质表面粗糙，粗糙程度随 洁治 器划过次数的增多而增加。