[Effect of etching concentration on bond strength of the light-cured resin reinforced glass ionomer cement].
OBJECTIVE
To compare the shear strength of a light-cured resin reinforced glass ionomer cement with brackets after the enamel was etched with different etching concentrations.


METHODS
sixty maxillary first premolars were randomly divided into 6 groups (A, B, C, D, E, F) with 10 teeth in each group. Then the teeth in each group were treated with different methods. All specimens were bathed with an artificial saliva after 10-minute bonding for 24 hours, then the shear strength were tested. The adhesive remain index (ARI) after bracket removal from the enamel was recorded and analyzed using SPSS11.5 software package.


RESULTS
The mean shear bond strength was 14.786 MPa+/-4.940 Mpa in group A, 7.002 MPa+/-3.768 Mpa in group C, 7.879 MPa+/-3.013 Mpa in group D, 7.452 MPa+/-2.561 Mpa in group E, 7.406 MPa+/-2.407 Mpa in group F, while not tested in group B. The difference was not significant among group C, D, E and F. While the difference was significant between group A and the other groups. The difference of ARI in each group was not significant.


CONCLUSIONS
The different etching concentrations in this experiment had no significant influence to the shear strength of the brackets which were boned with RMGIC. There was no significant difference of ARI among the six groups in which enamel was treated with different etching concentrations.
Fang
Bo-Jun
BJ
Department of Stomatology, Shengjing Hospital, China Medical University, Shenyang 110004, Liaoning Province, China. sys1203@hotmail.com
Wang
Wei
W
D001641:Bicuspid; D001840:Dental Bonding; D003743:Dental Enamel; D045662:Dental Etching; D005899:Glass Ionomer Cements / Q000737:chemistry*; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry; D012464:Saliva, Artificial; D033081:Shear Strength; D013499:Surface Properties
D005899:Glass Ionomer Cements; D019279:Resin Cements; D012464:Saliva, Artificial