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Accuracy of Standard and Geometric Pattern-Assisted Digital Scanning for Full-Arch Implant Prosthesis Frameworks

NCT07065487 · Status: RECRUITING · Phase: NA · Type: INTERVENTIONAL · Enrollment: 4

Last updated 2025-07-15

No results posted yet for this study

Summary

This clinical trial aims to compare three different impression techniques used to fabricate full-arch implant-supported dental prostheses. Accurate impressions are essential to ensure a passive and precise fit of the final prosthetic framework, which contributes to long-term implant success and patient comfort.

In this crossover study, participants with four osseointegrated dental implants in the lower jaw will undergo three types of impressions:

Conventional splinted impression using polyvinyl siloxane (PVS) material.

Standard digital impression using an intraoral scanner.

Geometric pattern-assisted digital impression, which incorporates a visual reference pattern to improve scan alignment and accuracy.

Each participant will receive all three impression techniques in a randomized sequence, at different time points. The accuracy of each method will be assessed by evaluating the passivity of the resulting prosthetic frameworks using two methods: (1) digital superimposition analysis to measure three-dimensional (3D) spatial deviation, and (2) the clinical "one-screw test" to detect misfit.

The study seeks to determine whether digital scanning, particularly with geometric pattern assistance, can provide accuracy comparable to or better than conventional methods. Findings may guide improvements in digital prosthodontic workflows and support more efficient, predictable treatment outcomes.

Conditions

  • Edentulous Jaw
  • Dental Prosthesis, Implant-Supported
  • Prosthodontics
  • Dental Implantation, Endosseous

Interventions

DEVICE

Intraoral Scanner - Standard Protocol

A full-arch digital impression is obtained using a high-precision intraoral scanner. Scan bodies are placed on multi-unit abutments and scanned without the use of external reference markers or geometric aids. The scan follows the manufacturer-recommended scanning path to capture the complete arch. This serves as a baseline digital technique for comparison with geometric pattern-assisted scanning.

DEVICE

Intraoral Scanner with Geometric Reference Pattern

The same intraoral scanner is used, but with an additional geometric reference pattern introduced in the scanning field to improve stitching accuracy and alignment of the digital scan.

PROCEDURE

Conventional Splinted Impression Technique

A physical impression is taken using open-tray impression copings splinted with DuraLay resin and polyvinyl siloxane (PVS) material in a custom tray, according to conventional protocols for full-arch implant prostheses.

Sponsors & Collaborators

  • Mirna ashraf anis heneen

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
DIAGNOSTIC
Masking
NONE
Model
CROSSOVER

Eligibility

Min Age
30 Years
Max Age
70 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2025-09-30
Primary Completion
2026-09-15
Completion
2026-09-15

Countries

  • Egypt

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07065487 on ClinicalTrials.gov