Shear Bond Strength of Aegis® Orthodontic Adhesive with ACP

Amorphous calcium phosphate (ACP) filled composite resins are known to recover 71% of the lost mineral content of decalcified teeth and may reduce the prevalence of white spots around orthodontic appliances. Objective: To compare the enamel shear bond strength (SBS) achieved in vitro using Aegis^® light cured orthodontic adhesive (Bosworth Co.) and Transbond^TM XT (3M/Unitek). Method: Shear bond strength (SBS) was measured on extracted human teeth. The teeth were imbedded in acrylic ring molds, cleaned with coarse, oil free pumice with a rubber prophylaxis cup and rinsed with water. Teeth were lightly air dried, Aegis^® and Transbond^TM XT materials were applied according to the manufacturer's instructions. Metal rectangular brackets (3.01x3.67) mm were bonded on the teeth, and the teeth were stored in distilled water for two hours at 37 °C. MTS, Alliance RT/5 with head speed of 5mm/min was used to measure the break stress in MPa. Statistical analysis was performed. Results: The average shear bond strength (std dev) in MPa are summarized in table.

Material Tested	Shear Bond Strength (MPa)
Aegis®	9.8 ± 3.0
TransbondTM XT	10.2 ± 3.6

Conclusions: Aegis^® and Transbond^TM XT showed no significance differences in shear bond strength