الفهرس 
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Abstract
Purpose. Evaluation of trueness and tissue surface adaptation of digital versus conventional mandibular implant assisted complete overdenture (IACO). Keywords. Digital overdenture, 3D printing, Trueness, Tissue surface adaptation. Materials and methods. Two implant analogs were installed in the inter foraminal region of the completely edentulous mandibular epoxy resin model which was scanned and saved as a Standard Tessellation Language (STL) file for future evaluation. The model with the implants was duplicated into twenty-stone models. All models were scanned and the STL files were saved for digitally designed twenty IACO by CAD software. Half of the digitally designed IACO were fabricated by three dimensions (3D) printing technology and the other half were fabricated by the conventional pack and press technique. To evaluate the trueness all IACO were scanned and superimposed to the STL files of the original design by using the Geomagic software. By using the same software, the gap distance between the intaglio surface of the scanned IACO and the scanned reference model were measured to evaluate the tissue surface adaptation. ‘Data was collected and tabulated. Statistical analyses were performed using Statistical Package for Social Sciences (SPSS version 26). Results. The statistical analysis revealed a highly significant difference between the two groups with less mean deviation value of the digital group with p-value of 0.000**. The Least mean of gap value is at the buccal slope of the digital group and the highest mean of gap value is at the lingual slope area of the conventional group and the implant area of the digital group. The statistical analysis revealed a significant difference between the two groups with p-value0.035* at the implant region. There is a significant difference in the average overall tissue surface adaptation between the two groups with less mean deviation value of the digital group with p-value of 0.041*. Conclusion. The digital group has better trueness and tissue surface adaptation than the conventional group. Despite the gap distance at the implant area and retromolar pad in the digital group, the average overall fit of the digital group is better than the conventional group.