Flowable composite an alternative orthodontic bonding adhesive: an in vitro study

To determine the clinical applicability of Ormocer based fowable adhesive (Admira fow) in comparison with BisGMA based adhesive (Transbond XT) and Ormocer based packable adhesive (Admira).

Sixty human premolars, divided into group I (n = 20) Transbond XT, group II (n = 20) Admira and group III (n = 20) Admira fow were bonded with metal brackets using adhesives. Brackets were debonded in shear on an Instron universal testing machine with a crosshead speed of 1 mm per minute. The mode of bond failure was determined by modifed ARI index.

The results obtained from SBS evaluation and modifed ARI showed highest shear bond strength for Transbond XT (SD 11.64) 3.68 followed by Admira fow (SD 11.0) 2.87 and least for Admira (SD 9.42) 2.21. However, the difference was not statistically signifcant, but an intergroup comparison done using Independent student 't' test, showed statically signifcant difference between Transbond XT and Admira. Kaplan-Meier survival analysis showed least survival median value for Admira, but the survival median value is not statistically signifcant among the three groups. All groups had modifed ARI score of three (60-70%), suggestive of cohesive type of failure.

The in vitro study showed that fowable Ormocer can be an good alternative to commonly used BisGMA based adhesive but the its effcacy needs clinical assessment through a survival analysis. CLINICAL SIGNIFCANCE: Admire fow can defnitely be considered as an alternative bonding system due to their comparable bond strength and debonding characters and reported properties of biocompatibility.