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

## TL;DR

This study compares open-tray and closed-tray techniques for Nobel Active implant impressions, finding that open-tray is more accurate at higher angulations.

## Contribution

The study introduces a comparison of impression techniques for Nobel Active implants under varying angulations using 3D measurements.

## Key findings

- At 0° angulation, both open-tray and closed-tray techniques showed similar accuracy.
- At 15° and 25° angulations, open-tray techniques were significantly more accurate than closed-tray.
- Impression errors increased with implant angulation, especially in closed-tray groups.

## Abstract

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.