Purpose: The objective of this investigation was to estimate the various bulk fill restorations clinical performance and fracture resistance in class II cavities. Materials and Methods: The 30 freshly extracted human premolars fracture resistance was evaluated in the invitro portion of this study. The bulk-fill restorative materials were applied to the mesio-occluso-distal (MOD) cavities that were prepared. Teeth were divided into three groups of 30 teeth (10 for each test) corresponding to the treatment materials utilized (A). Group (A1): Self-adhesive composite (Surefil one); Group (A2): Thermoplasticized (Viscalor); Group (A3): EquiaForteTM HTfil. Specimens were examined for fracture resistance using universal testing machine. For the clinical study total 30 carious molar teeth in class II cavities were assigned into three main groups (10 for each group test) according to the treatment material using some selected World Dental Federation (FDI) criteria at different time intervals of baseline,6 months and 12months. Results: The results showed that fracture resistance and functional properties (fracture and retention)of the Thermoplasticized (viscalor) showed statistically significant highest mean value followed by Self-adhesive composite (surefil one), while the lowest mean value was recorded for Equiaforte TMHT Fil. Conclusion: Among the three groups Thermoplasticized (viscalor) appeared to be promising as a bulk fill restorative material.