Dr Arqam Ali Khan, Dr Sehrish Zafar, Dr Asraa Naeem
Objective: The purpose of this study was to evaluate the shear bond strength of Heliosit Orthodontic and then compare it with the control group of Transbond XT. Study Design: A Retrospective Comparative Study. Place and Duration: In the Orthodontics department of Punjab Dental Hospital, Lahore for one year duration from June 2017 to June 2018. Methods: The study comprises of Groups A and B of 80 human premolar teeth each bonded with mesh based metal brackets. The bonding agent used in group A was Transbond XT and that of group B was Heliosit Orthodontic. Every effort was made to control the cofounding variables including force of application of bracket, light tip distance, orientation of bracket in the acrylic block and storage of teeth before and after bonding this was followed by debonding of the brackets by shearing in a testing machine made universally. Results: It was found that the Transbond XT mean shear bond strength was 25.5 MPa and that of Heliosit orthodontic was 10.54 MPa. The t-test revealed that there was a static variation between the shear bond strength of the two groups. Conclusion: In conclusion, both composites bond strengths were tested which observed to be greater than the recommended values of Reynolds for the composites to be clinically useful. It is recommended that the bond strength and the viscosity of the Heliosit Orthodontic be increased for it to be clinically as effective as Transbond XT. Key words: Heliosit Orthodontic, Transbond XT, Shear bond strength.