TY  - JOUR 
T1  - Effect of a carbamide peroxide bleaching gel containing calcium or fluoride on human enamel surface microhardness
JO  - Brazilian Dental Journal
A1  - Oliveira, Rogério de
A1  - Paes Leme, Adriana Franco
A1  - Giannini, Marcelo
SN  - 0103-6440
UL  - 10.1590/S0103-64402005000200003
VL  - 16 
Y1  - 2005
PB  - Brasil 
ER  -