Effect of nanofiller on shear bond strength of orthodontic bracket
objective: To determine the influence of the type of orthodontic adhesive and nanofiller on mechanical properties of orthodontic brackets
Materials and Methods: Metal brackets were bonded to extracted human premolars (n =125) by using four types of adhesives including hydrophilic, hydrophobic resins and nanofiller(ox50), microfiller(glass).The teeth were stored in distilled water at 37 C for 24 hours and thermocycled in distilled water.10 samples of every group selected randomly for shear bond strength with universal test machine. Statistical evaluation was made using the ONE WAY ANOVA test .
Result: The highest shear bond strength was in hydrophilic,nanofiller group and least shear bond strength in hydrophilic,microfiller group
Conclusion: Adhesives which containing nanofillers can be used safely with different advantages of less discoloration and more esthetic with higher shear bond strength and with fewer adhesive remains can be used successfully for orthodontic bracket bonding.