TY  - JOUR 
T1  - Comparison surface characteristics and chemical composition of conventional metallic and Nickel-Free brackets
JO  - Brazilian Oral Research
A1  - SHINTCOVSK, Ricardo Lima
A1  - KNOP, Luegya Amorim Henriques
A1  - GANDINI Jr, Luiz Gonzaga
A1  - MARTINS, Lidia Parsekian
A1  - PIRES, Aline Segatto
SN  - 1806-8324
UL  - 10.1590/1807-3107BOR-2015.vol29.0022
VL  - 29 
Y1  - 2015
PB  - Brasil 
ER  -