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Shear Bond Strength Lab Report

937 Words4 Pages

The purpose of this experiment was to determine if there was a significant difference in the shear bond strength of orthodontic brackets on teeth bleached with hydrogen peroxide and teeth bleached with carbamide peroxide. It was hypothesized that the teeth bleached with carbamide peroxide would have a lower shear bond strength than the teeth bleached with hydrogen peroxide. In this experiment, 30 human teeth were separated into three groups: control, hydrogen peroxide, and carbamide peroxide. In the control group, the teeth were etched with 37% phosphoric acid gel for 45 seconds and then distilled water was used to rinse off the gel. An LED curing light was used to cure each tooth for 45 seconds, and then remained on the tooth for 3.5 minutes before any remaining phosphoric acid gel was rinsed off with distilled water. For the teeth labeled “Carbamide”, the same method applied to the control group was used here. After the brackets had been applied to each tooth, 3 mm of the 36% carbamide peroxide gel was brushed onto the teeth until the enamel was fully …show more content…

The null hypothesis stated that there was not a significant difference in the shear bond strength of orthodontic brackets on teeth bleached with carbamide peroxide and hydrogen peroxide. The results of the t-test showed that there was indeed a significant difference in the shear bond strength of orthodontic brackets on teeth bleached with carbamide peroxide and teeth bleached with hydrogen peroxide. Do to these results, the null hypothesis was rejected and the alternate hypothesis, which stated that there was a significant difference in the shear bond strength of orthodontic brackets on teeth bleached with carbamide peroxide and hydrogen peroxide was

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