Effects Of A Fluoride Vanish On The Prevention Of Enamel Demineralization And Brackets Bond Strength: An In Vitro Study

Objective: PH value through the cycle of in vitro experiments to study the effects of a fluoride vanish on inhibition of enamel demineralization.Methods: to be a result of orthodontic extraction of healthy premolars 60, were randomly divided into three groups, experimental group 1, when the bracket bonding after etching using fluoride vanish. Experimental group 2, End bracket bonding after 5 minutes using fluoride vanish . The control group when bonded brackets without making other treatment. All the samples of the PH value of the daily cycle of in vitro experiments (0.1M demineralization of lactic acid in 4 hours, the rest of the time placed in artificial saliva), a total of 30 days. The next day demineralization fluid collection, with fully automatic biochemical analyzer fluid lactic acid measurement in the leaching of calcium ions. The data using SPSS12.0 statistical software for statistical analysis.Results:1. Experimental group 1 of dissolved calcium 1.55mmol / 1, the experimental group 2 was dissolved calcium 1.76mmol / 1, the control group of dissolved calcium 1.83mmol / 1.2. Experimental group 1, the volume of enamel demineralization significantly lower than the control group (P <0.01), experimental group 2 was slightly lower than the volume of enamel demineralization control group. (P <0.01)Conclusion: fluoride vanish can prevent orthodontic demineralized enamel, and when the bracket bonding after etching fluoride better protect the paint. Objective: To understand the etching when bonding brackets after the use of fluoride vanish on the bracket the impact of bond strength.Methods: to be a result of orthodontic extraction of healthy premolars 48, were randomly divided into 2 groups. Group 1 (experimental group): with 35% phosphoric acid etching gel 30 seconds, 15 seconds Washing, drying, coating evenly fluoride vanish layer of paint, after drying and 30 seconds, according to Lake Barre Manual enamel conventional sticky adhesive end brackets, compact and complete removal of excess adhesive around the bracket. Group 2 (control group): with 35% phosphoric acid etching gel 30 seconds, 15 seconds Washing, drying, according to Lake Barre Manual enamel conventional adhesive bonding brackets, compact and completely remove the brackets around the redundant binder. Save water bath temperature of 37 degrees with a material testing machine mechanical testing after a 24-hour shear bond strength. Statistics tooth surface and binder residues.Results:1. The experimental group of anti-shear strength for 13.344±1.120MPa, shear strength of the control group to 15.289±1.140 MPa.2. The experimental group and control group values of shear bond strength, there was a significant difference (P <0.05).3. ARI points show the experimental group after removal of tooth surface bracket adhesive residue control group is relatively small, the rank sum test, between the two groups was significant difference (P <0.05).Conclusion: The two sets of shear bond strength compared with shear strength of the control group and experimental group there Significant difference, but the experimental group was still higher than the shear bond strength of orthodontic shear bond strength required for the smallest 6MPa , to meet clinical needs.