Abstract
This study sought to assess the diagnostic performance of distinct digital radiographic systems in detecting microgaps at the implant–impression coping interface. Experimental assemblies with either a controlled 0 μm-100 μm microgap or complete adaptation were irradiated at angulations of 0-25, and the resulting radiographs were evaluated by multiple calibrated clinicians. CCD-based systems demonstrated superior spatial resolution compared with IP-based systems. Diagnostic reliability remained stable in external connection implants across the tested angulations. Conversely, internal connection implants exhibited substantial interpretive variability, including false-positive gap identifications. These findings suggest that the deeply situated engagement interface characteristic of internal connection designs diminishes radiographic discernibility. The results underscore the necessity of precise beam angulation and standardized radiographic protocols to ensure accurate verification of impression coping seating during implant prosthodontic procedures.
