Confocal microscopy revealed that curettes [ mean changes in the value of surface roughness average reduced by 0.11 0.3 ] , piezo-ceramic ultrasonic scaler ( roughness average reduced by 0.47 0.93 ) and piezosurgery ultrasonic scaler ( roughness average reduced by 0.62 0.93 ) left a smoother surface than termination diamond burs ( roughness average increased by 0.39 0.18 ) .
