Three-dimensional Accuracy of Direct Digital Scanning for All on Four Implants in Comparison to a Custom-made Verification Jig in Fully Edentulous Patients

NCT07106177 | Completed

• 1 other identifier: 1093-05/2025
• Study Type: interventional
• Target: 22
• Locations: 1 country
• Sites: 1

Brief Summary

The aim of this study is to assess the three-dimensional accuracy of direct intraoral scanning in All-on-4 implant-supported prostheses by comparing intraoral scan data with a custom-made verification jig.

Conditions

Edentulism

Outcome Measures

Primary Outcomes (3)

• Vertical Deviation

  Analogues Saved from the Intraoral scan and those saved from stone model were superimposed. The vertical discrepancy (mm) in implant position between intraoral digital scanning and verification jig-based stone model in All-on-4 implant cases.

  through study completion, an average of 1 year

• Angular deviation

  Analogues Saved from the Intraoral scan and those saved from stone model were superimposed. The angular difference (degrees) in implant position between intraoral digital scanning and verification jig-based stone model in All-on-4 implant cases.

  through study completion, an average of 1 year

• Horizontal deviation

  Analogues Saved from the Intraoral scan and those saved from stone model were superimposed. The horizontal discrepancy (mm) in implant position between intraoral digital scanning and verification jig-based stone model in All-on-4 implant cases.

  through study completion, an average of 1 year

Study Arms (2)

Scanning with the aid of jig

EXPERIMENTAL

Other: Scanning with verification jig

Scanning without jig

ACTIVE COMPARATOR

Other: Direct intraoral scanning

Interventions

Scanning with verification jig OTHER

Comparing Relative Implant Positions of the 4 implants in each case obtained through desktop scanning of intraoral provisional verification jig. All-on-4 treatment for mandibular and maxillary edentulous cases were scanned using the Medit i700 intraoral scanner. Scan data were imported into Exocad software, where scan-body matching was performed using the Neodent library to determine the positions of multiunit abutment analogues.

Scanning with the aid of jig

Direct intraoral scanning OTHER

Comparing Relative Implant Positions of the 4 implants in each case obtained through direct intraoral scanning without jig. All-on-4 treatment for mandibular and maxillary edentulous cases were scanned using the Medit i700 intraoral scanner. Scan data were imported into Exocad software, where scan-body matching was performed using the Neodent library to determine the positions of multiunit abutment analogues.

Scanning without jig

Eligibility Criteria

• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• Patients with complete mandibular edentulism.
• Patients requiring full-arch rehabilitation with an All-on-4 implant concept.
• Absence of systemic conditions that could affect bone healing or osseointegration.
• Adequate bone volume in the anterior mandible for implant placement without the need for additional grafting.
• Patients capable of maintaining oral hygiene

You may not qualify if:

• Patients with uncontrolled systemic diseases (e.g., diabetes, osteoporosis).
• History of head and neck radiation therapy.
• Severe parafunctional habits (e.g., bruxism).
• Patients with inadequate bone volume requiring extensive grafting procedures.
• Active periodontal or oral infections.

Sponsors & Collaborators

• Yasser Ahmed: lead
• Alexandria University: collaborator

Study Sites (1)

Faculty of Dentistry, Alexandria University

Alexandria, Egypt

Location

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: SPONSOR INVESTIGATOR
• PI Title: Associate Professor of Fixed Prosthodontics

Study Record Dates

• First Submitted: July 22, 2025
• First Posted: August 6, 2025
• Study Start: June 3, 2024
• Primary Completion: July 10, 2025
• Study Completion: July 10, 2025
• Last Updated: August 6, 2025

Record last verified: 2025-08

Locations

EG (1)