Abstract
The purpose of this study was to evaluate the shear bond strengths of fluoride releasing orthodontic adhesive to human enamel. Also, we examined the release of the fluorine of each adhesion materials and recharge performance. As a result, Superbond orthomite is the strongest (16.7 MPa) which deteriorated in order of Fuji ortho LC (14.2 MPa), Krasper F (12.9 MPa), Beauty ortho bond (10.1 MPa),Beauty ortho bond salivatect (7.4 MPa). As for Beauty ortho bond, the enamel surface was smooth as a result of SEM observation after the shear bond strength test. However, the enamel prism structure was exposed in Superbond orthomite and Krasper F which showed strong adhesive strength, and injury to enamel surface. By the measurement of the amount of release of the fluorine and recharge performance, most fluorine released it after one day of the measurement. On the second day, the amount of fluoride release decreased with the third day and became the equilibrium from day 4 to day 7. The most fluoride ions were released from Fuji ortho LC as resin modified glass ionomer cement. Beauty ortho bond which contained S-PRG filler followed it. It had the same tendency after fluoride recharge. Fluoride releasing orthodontic adhesive has moderate adhesive strength with little effect on enamel surface. These had the ability for the release of larger amounts of fluorine and recharge performance, and it was shown that it was effective materials for dental caries during orthodontic treatment.
