This prospective controlled clinical trial evaluates the three-dimensional positional accuracy of implant-level impressions obtained using scannable healing abutments compared with conventional open-tray and closed-tray impression techniques in partially edentulous patients with unilateral free-end saddle situations.

Accurate transfer of implant position is critical for achieving passive fit of implant-supported prostheses. This study compares the trueness of implant impressions obtained using a digital workflow based on scannable healing abutments with conventional open-tray and closed-tray impression techniques. Twenty-two partially edentulous patients with unilateral distal extension ridges will undergo all three impression techniques. Three-dimensional deviations will be quantified using best-fit superimposition and root mean square analysis, with the open-tray technique serving as the reference standard.

Inclusion Criteria:

• Partially edentulous patients with unilateral free-end saddle (Kennedy Class II)
• Adequate bone for two implants
• Good systemic health
• Ability to provide informed consent

Exclusion Criteria:

• Active periodontal disease
• Poor oral hygiene
• Parafunctional habits
• Temporomandibular disorders
• Heavy smoking (>10 cigarettes/day)

Individual participant data will not be shared. The data generated in this study include identifiable clinical and radiographic measurements that are specific to the study protocol and participants. De-identified aggregate data are reported in the published manuscript.