Today, tooth- or implant-supported single crowns and short-span fixed partial dentures can be fabricated on the basis of an intraoral scan, but the scanning accuracy decreases with increasing length of the jaw section to be captured. An accurate scan is also made more difficult by edentulous jaw sections, as these provide the scanner with few landmarks for proper three-dimensional image composition. With respect to both edentulous and edentulous patients with dental implants, the currently available literature does not provide a firm basis for deciding whether such patients can already be scanned with sufficient accuracy. It is considered problematic in this context that the findings on digital impression accuracy, regardless of whether teeth or implants have been scanned, are based almost exclusively on the results of in vitro studies. Conclusions about the accuracy of intraoral scanners under clinical conditions with moving patients and limited accessibility to the structures to be imaged, especially in the presence of blood, saliva or sulcus fluid, are extremely limited based on these data. Therefore, the aim of this study is to determine the clinical scanning accuracy of two current intraoral scanning systems for the three-dimensional acquisition of the position of two interforaminal dental implants in the edentulous mandible. The influence of artificial landmarks to achieve increased scan accuracy will also be tested.
Study Type
OBSERVATIONAL
Enrollment
16
Department of Prosthetic Dentistry, University Hospital Heidelberg, University of Heidelberg
Heidelberg, Baden-Wurttemberg, Germany
Effect of intraoral scanner on scanning accuracy
Accuracy will be given as trueness and precision according to ISO 20896-1:2019 Dentistry - Digital impression devices - Part 1: Methods for assessing accuracy. Implant distance deviations will be measured in \[µm\] and implant angle deviations in \[°\].
Time frame: through study completion, an average of 2 hours
Effect of artificial landmarks on scanning accuracy
Accuracy will be given as trueness and precision according to ISO 20896-1:2019 Dentistry - Digital impression devices - Part 1: Methods for assessing accuracy. Implant distance deviations will be measured in \[µm\] and implant angle deviations in \[°\].
Time frame: through study completion, an average of 2 hours
Effect of implant attachment on scanning accuracy in [µm] and [°]
Accuracy will be given as trueness and precision according to ISO 20896-1:2019 Dentistry - Digital impression devices - Part 1: Methods for assessing accuracy. Implant distance deviations will be measured in \[µm\] and implant angle deviations in \[°\].
Time frame: through study completion, an average of 2 hours
Effect of intraoral scanner/use of artificial landmarks on intraoral scanning process/quality of the 3D dataset by a study investigator on the basis of qualitative criteria (see description)
Effect of intraoral scanner/use of artificial landmarks on intraoral scanning process (successful, successful with difficulties, failed)/quality of the 3D dataset (Surface irregularities, deformations, stitching errors, other)
Time frame: through study completion, an average of 2 hours
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