Abstract
This study was designed to evaluate the shear bond strength of orthodontic brackets bonded to teeth under salivary contamination using three bonding systems; composite with self etching primer, composite with moisture insensitive primer and Assure hydrophilic bonding system. The adhesive remaining index scores were inspected and recorded for each group. Freshly extracted 45 human sound premolars were used in this study. They were randomly divided into three equal groups; each group was assigned with a bonding system. Debonding was done using a universal testing machine. The debonding forces were recorded and statistically analyzed. The results showed that all the three used bonding systems were in the clinically accepted range of the shear bond strength. Moisture insensitive primer group recorded the highest shear bond strength values followed by the self etching primer group; While Assure hydrophilic bonding system recorded the lowest shear bond strength values.
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