Trueness of Full Arch Scans and Generated Digital Implant Models

Assessment of Accuracy of Full Digital Workflow in Fabrication of Four-Implant Screw-Retained Mandibular Hybrid Prostheses

The goal of this clinical trial study is to evaluate the accuracy of the full digital workflow for four-implant, screw-retained mandibular hybrid prostheses in patients with completely edentulous mandible.

The main issues to evaluate are:

• The trueness of full arch digital scans when additional geometric scanning aids are coupled with the scan bodies.
• The trueness of the generated 3D-printed DIMs.

Participants will provide two types of impressions to compare after osteointegration; the first will be conventional open tray impression used as a gold standard comparator, the second will be digital scans with additional geometric scanning aids coupled with the scan bodies.

Accordingly generated 3D-printed DIMs will be printed and compared to the digital image to evaluate its accuracy.

Inclusion Criteria:

• Patients having a completely edentulous lower arch that could be restored by fixed screw-retained implant hybrid dentures.
• Patients having a substantial bone height and width at prospective implant sites to install four standard-size inter-foraminal implants.
• Sufficient crown height space according to criteria of all-on-4.
• good oral hygiene and motivation

Exclusion Criteria:

• Patients with bad oral hygiene.
• Patients with limited mouth opening.
• Vulnerable groups.
• Uncooperative patients.
• Patients receiving or undergoing radiotherapy or chemotherapy.
• Patients with systemic diseases affecting bone metabolism.
• Smokers