An In Vitro Evaluation Of Shear Bond Strength Of Two Self Etching Primers At Two Different Time Intervals.

Objective : To evaluate the clinical efficacy of a new restorative material Clearfil S3 bond, SEP for orthodontic bonding in comparison with Transbond plus SEP at two different time intervals. Methodology : The present study was planned to evaluate the clinical efficacy of a new restorative material Clearfil S3 bond, in comparison with TPSEP at two different time intervals (30 minutes and 24 hours).Stainless steel brackets (Gemini 3M) were bonded on extracted premolar teeth using the above two mentioned SEP’s, Transbond XT (3M UNITEK), a BISGMA based composite was used as a common adhesive. Shear bond strength and debonding characters of the two materials were compared. Results : It can be seen that the mean SBS of Clearfil S3 bond is marginally higher both at 30 minutes (4.8 ±0.63 MPa) and 24 hours (8.5 ±0.59 MPa) time of debonding compared to that of TPSEP (4.43±0.46 MPa; 7.0 ± 0.42 MPa). The difference noted was statistically significant (p= 0.05%). Key Words Clearfil S3 bond, Transbond plus SEP, Self Etching Primers, Shear Bond Strength. 10Methacryloyloxydecyl dihydrogen phosphate (MDP) and other constituents of this SEP are comprised of Bisphenol A diglycidylmethacrylate (BisGMA), 2Hydroxyethyl methacrylate (HEMA) (hydrophilic), Ethyl alcohol, Water and [5] Silanated colloidal silica . Clearfil S3, used for restorative purpose, has recently been considered as one step SEP in orthodontics. Clearfil S3was evaluated in comparison with Transbond plus SEP, whose Shear bond strength (SBS) was determined at two different time intervals, half an hour after bonding when the initial arch wires are placed and 24 hours from the time of bonding when the adhesive would achieve most of its bond strength.