Introduction: Crestal bone loss around implants may be regarded as threat to durability of the implant treatment. Objectives: To evaluate and compare the crestal bone loss in prefabricated titanium abutmemts and castable cobalt-chromium abutments. Methods: The present study was conducted on five partially edentulous patients seeking fixed replacement of missing teeth. Each of the patients received Prefabricated abutments on the right side (Group 1, n=5) and Castable abutments on the left side (Group 2, n=5). Intraoral periapical radiograph and orthopantomogram were evaluated to assess the available bone height and width and vital structures. Patients were reviewed after 3 months. The measurement of bone levels on the mesial and distal side of the implant was performed parallel to the long axis of the implant from point of reference to the first bone-to-implant (BIC). Results: Mean values for group 1 and group 2 at the time of loading and 3 months after loading does not shows a significant difference. When compared to group 1 the crestal bone loss for group 2 was found to be less at the time of loading and after 3 months of loading. Conclusion: It is concluded that there was no significant crestal bone loss between prefabricated and castable abutments at the time of loading while there is a significant increase in bone loss for prefabricated abutments after 3 months of loading. © 2021 Elsevier B.V., All rights reserved.