TY  - JOUR 
T1  - A comparative evaluation of the efficacy of manual, magnetostrictive and piezoelectric ultrasonic instruments: an in vitro profilometric and SEM study
JO  - Journal of Applied Oral Science
A1  - Singh, Sumita
A1  - Uppoor, Ashita
A1  - Nayak, Dilip
SN  - 1678-7757
UL  - 10.1590/S1678-77572012000100005
VL  - 20 
Y1  - 2012
PB  - Brazil 
ER  -