RÉSUMÉ
Objectives: To compare the shear bond strength of a nano‑ceramic restorative composite Ceram‑X MonoTM♦, a restorative resin with the traditional orthodontic composite Transbond XTTM† and to evaluate the site of bond failure using Adhesive Remnant Index. Materials and Methods: Sixty extracted human premolars were divided into two groups of 30 each. Stainless steel brackets were bonded using Transbond XTTM† (Group I) and Ceram‑X MonoTM♦ (Group II) according to manufacturer’s protocol. Shear bond strength was measured on Universal testing machine at crosshead speed of 1 mm/minute. Adhesive Remnant Index scores were assigned to debonded brackets of each group. Data was analyzed using unpaired ‘t’ test and Chi square test. Results: The mean shear bond strength of Group I (Transbond XTTM†) was 12.89 MPa ± 2.19 and that of Group II (Ceram‑X MonoTM♦) was 7.29 MPa ± 1.76. Unpaired ‘t’ test revealed statistically significant differences amongst the shear bond strength of the samples measured. Chi‑square test revealed statistically insignificant differences amongst the ARI scores of the samples measured. Conclusions: Ceram‑X MonoTM♦ had a lesser mean shear bond strength when compared to Transbond XTTM† which was statistically significant difference. However, the mean shear bond of Ceram X Mono was within the clinically acceptable range for bonding. Ceram‑X MonoTM† and Transbond XTTM† showed cohesive fracture of adhesive in 72.6% and 66.6% of the specimens, respectively.