Accuracy of Full Arch Intraoral Scanning

Condition(s) studied

Investigational drug(s) / intervention(s)

The Photogrammetry-assisted intraoral scanning: The Photogrammetry-assisted intraoral scanning; will be executed using the MUA-compatible ioConnect ® photogrammetry system components exactly in the same sequence as recommended by the manufacturer

The modified approach of splinting-assisted intraoral scanning: The scan bodies will be mounted over the MUA and loosely connected with a power chain before the Medit scanner single-shot scanning procedure. Using the additional scan option in the Medit scanner software, another single-shot scan will be obtained and superimposed to the first scan yielding a color map that reflects the accuracy of the obtained scan and directs a highly precise final scan.

Simple splinting-assisted intraoral scanning: The Medit i600 direct intraoral classical scans will be obtained while applying only a basic simple splinting

Study summary

Although an intraoral scanner IOS can offer the clinician a completely digital workflow, achieving trustworthy digital scans in edentulous jaws is challenging because of the lack of fixed anatomical landmarks. From this perspective, several methods have been proposed to improve the accuracy of digital scanning, however, related results remain inconclusive, and previously proposed devices have had limitations, such as bulkiness, excessive manufacturing requirements, and poor commercial applicability.

Thus, this study aims to clinically compare the effect of conventional versus photogrammetry intraoral scanning methods on the passive fit of mandibular all-on four screw-retained frameworks.

Eligibility

Primary outcome measure(s)

• Clinical assessment of passive fit following the latest update of the one screw test — six months
  Three CAD/Milled frameworks for each subject will be realized based on the acquired scans. The passive fit of each framework will be assessed intraorally following the Sheffield test: The test Part I involves checking the fit of the framework using finger pressure then tightening one of the most distal abutment screws. when an accurate horizontal and perpendicular fit viewed under magnification (will be categorized as 3 or excellent). If a slight "shadow" or suspicion of a vertical discrepancy, exists between the framework and abutment, a satisfactory passive fit will be confirmed by part 2 of test; If a suspected fit discrepancy can be closed using a 13mm wide modelling wax strip, representing 20 KN/m2 pressure load without distorting, then the fit is deemed to be clinically acceptable (categorized as 2 or good). If the wax does distort or is unable to close the discrepancy, will be (categorized as 1 or poor). this categorization arbitrarily defined by authors.

Trial sites (1)

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