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OpenTrials
Completed

NCT Number: NCT07106177

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

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.

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Key information

Conditions

Edentulism

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Faculty of Dentistry, Alexandria University

Alexandria, Egypt

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • 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

Exclusion criteria

  • 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.

Treatment and study plan

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.

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.

Primary outcomes

  1. Vertical Deviation

    Time frame: through study completion, an average of 1 year

    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.

  2. Angular deviation

    Time frame: through study completion, an average of 1 year

    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.

  3. Horizontal deviation

    Time frame: through study completion, an average of 1 year

    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.

Sponsors and collaborators

Lead sponsor

Yasser Ahmed

Other

Collaborators

  • Alexandria University

Registry information

Important dates

Study start
2024
Primary completion
2025
Study completion
2025
First posted
Aug 6, 2025
Registry last updated
Aug 6, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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