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Completed

NCT Number: NCT06040385

Effect of Geometric Modifications of Implant Scan Bodies

The aim of this clinical study will be the effect of geometric modifications of implant scan bodies compared to conventional transfer techniques on passivity of all on four mandibular restorations

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Key information

Conditions

Prosthesis Durability Pathologic Processes Pathological Conditions, Signs and Symptoms Postoperative Complications Prosthesis Failure

Age range

45 year–70 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Mansoura University ,Faculty of dentistry

Al Mansurah, 35516, Egypt

About this study

The aim of this study will be the effect of geometric modifications of implant scan bodies compared to conventional transfer techniques on passivity of all on four mandibular restorations.

Evaluation method:

The trueness of the final impression and the passivity of the final prosthesis will be evaluated by two methods:

Invitro evaluation For each patient in every group, the standard tessellation language (STL) files of scanned impressions will be superimposed on the reference file to determine the 3D surface, linear, and angular position analysis.

The STL files for both frameworks will be superimposed on the reference file to determine the passivity.

In vivo (Clinical) evaluation Radiographic evaluation using long cone parallel technique will be done for the framework after 6 month (T6) after one year (T12), and after 18 month (T18) from insertion.

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

  • 1. All selected patients will have four implants placed in the mandibular interforaminal region according to all -on -four concept.
  • All selected patients have a healthy mucosa and with no clinical complications.
  • All patients are cooperative and approve the proposed treatment protocol.

Exclusion criteria

  • 1. Patients who reject to participate in the study. 2. Patients who need implant placement as a result of previous implant failure.

Treatment and study plan

Implant supported hybrid prosthesis

Device

For each patient, implant supported mandibular hybrid prosthesis will be fabricated digitally. Frameworks will be tried in patient's mouth, scanned intraorally by intraoral scanner (IOS).

Primary outcomes

  1. passivity of the prosthesis

    Time frame: one year

    Radiographic evaluation using long cone parallel technique will be done for the framework

  2. trueness of final impressions

    Time frame: one year

    For each patient in every group, the standard tessellation language (STL) files of scanned impressions will be superimposed on the reference file to determine the 3D surface, linear, and angular position analysis

Secondary outcomes

  1. patient satisfaction

    Time frame: one year

    patient satisfaction will be evaluated using Visual analogue scale questionnaire

Sponsors and collaborators

Lead sponsor

Mansoura University

Other

Registry information

Official study title

Effect of Geometric Modifications of Implant Scan Bodies Compared to Conventional Transfer Techniques on Passivity of Mandibular All on Four Restorations

Important dates

Study start
2023
Primary completion
2024
Study completion
2025
First posted
Sep 15, 2023
Registry last updated
Aug 14, 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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