A Novel Assessment Workflow of Implant Accuracy by Means of Stackable Guides: A Case Series.

Purpose: This study aims to assess the accuracy of one-piece implant placement using stackable surgical guides by means of a novel stent defined as 'number guide' screwed onto the fixed base template in order to improve the intra-surgical registration of the scan bodies.

Material and methods: A digital workflow was used for one-piece implant planning and placement. Participants were selected based on specific criteria, and stackable guides were used for fully guided implant placement with immediate provisional loading. The accuracy of implant placement was assessed by comparing pre- and post-intervention data registered with the aid of the number guide.

Results: Ten participants were treated with forty-seven one-piece implants placed in the maxilla and mandible. All implants achieved adequate primary stability, allowing immediate loading. Accuracy was measured by linear and angular deviations, showing greater precision in the mandible. Implant characteristics yielded statistically significant differences in terms of accuracy.

Conclusions: Fully guided digital workflow ensured precise implant placement and immediate provisional loading. The additional use of the number guide allowed effective accuracy assessments of the system in terms of linear and angular deviations, highlighting its potential to assess post-operative implant placement.