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A comparison between immediate and 24 hour bond strength

Liu Xinqiang, Zhang Ding, Sun Zhihui Department of Orthodontics, Medical School Hospital of Qingdao University, Qingdao 266003  
Objective The aim of this study was to compare the immediate and 24 hour bond strength. Method Forty extracted human premolars were randomly and evenly divided into 4 groups. Edgewise bracket was bonded on each tooth. The immediate shear bond strengthin group 1, the immediate tensile bond strength in group 2, the 24 hour shear bond strength in group 3, and the 24 hour tensile bond strength in group 4 were tested respectively. The adhesive remnant index was recorded. Results There were statistically significant differences in both shear and tensile bond strength between immediate groups and 24 hours groups. Conclusion In vitro, immediate bond strength was significantly lower than 24 hour.
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