Clinical acceptability of two self-etch adhesive resins for the bonding of orthodontic brackets to enamel.

Objective: To determine whether two self-adhesive resin cements, Clearfil SA and RelyX, can be used to successfully bond orthodontic brackets to enamel.

Materials And Methods: Seventy extracted premolars were custom mounted, cleaned and randomly divided into three groups. In group 1 (control), orthodontic brackets were bonded to 25 premolars using the Transbond Plus and Transbond XT two step adhesive systerm adhesive.

Forces of various nickel titanium closed coil springs.

Objective: To compare the forces generated by 14 different 9 mm springs supplied by five different companies.

Materials And Methods: Five replicates of 14 different 9 mm springs were evaluated, resulting in 70 total specimens. Each was extended once from its resting length to 12 mm and then was deactivated.