Effect of implant angulation and impression technique on Nobel active implant impressions: An original study

Accurate implant impressions are essential for the success and longevity of implant-supported prostheses. The Nobel Active system has a tapered body and aggressive thread design, demanding high precision. Therefore, it is of interest to compare open-tray and closed-tray techniques for impression accuracy. Implants were placed at 0°, 15°, and 25° angulations for evaluation. A Coordinate Measuring Machine was used for 3D deviation measurements. At 0°, both techniques showed negligible differences in accuracy. At 15° and 25°, the open-tray technique had significantly better accuracy (p < 0.05). Impression errors increased with implant angulation, mainly in closed-tray groups. Angulated implants posed greater challenges for accurate impressions. Thus, we show the role of angulation in impression precision. Open-tray techniques are preferred in angulated Nobel Active implant cases. This approach enhances prosthetic fit and improves clinical outcomes.