Extraoral Scanning of Implant Prosthetic Components under Difficult Conditions Using a Transfer Device
Abstract
:1. Introduction
2. Technique
- Prepare the transfer device. Make marks in three different regions on the chuck’s head with a metal bur (for better horizontal indexing of the chuck’s head) (Figure 1).
- Choose the implant analog according to the implant system used clinically. Mount the implant analog in the chuck; a 2–3 mm scannable area should be available for an intraoral scanner (Figure 1).
- During a clinical appointment, obtain a digital impression of mandibular and maxillary arches in the correct occlusion. Create an Exocad (Exocad GmbH, Darmstadt, Germany) order and import the 3D files.
- Choose an analog impression transfer that is suitable for the situation and exposes a sufficiently high area (4–5 mm) above the gingival margin. Scan intraorally the analog impression transfer screwed into the implant; export as an STL file. It is useful if the transfer abutment is sandblasted beforehand to achieve a better scan (Figure 2).
- Remove the analog transfer from the mouth and mount it in the transfer accessory.
- Scan with an intraoral scanner the analog transfer together with a sufficiently large area of the chuck, which will allow subsequent indexing in the CAD software; export as an STL file (Figure 3).
- Mount the digital scan body in the transfer accessory.
- Scan with an intraoral scanner the scan body together with a sufficient area of the chuck in order to permit correct indexing in the CAD software; export as an STL file (Figure 4).
- Import into the Exocad order the STL files from point 5 as an “extrajaw scan,” which is used for indexing the visible part of the transfer abutment (Figure 5).
- Import in the Exocad order the STL file from point 7 as an “extrajaw scan,” which is used for indexing the visible part of the device (chuck) (Figure 6).
- Access the Expert mode and isolate in the jaw scan only the part that contains the digital scan body.
3. Discussion
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- An intraoral digital impression of an analog classic transfer, which exposes a sufficiently high area above the gingival margin.
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- An extraoral digital impression of an analog transfer mounted in the transfer accessory (Wolfcraft Keyless Chuck Metal 2625000), which allows to achieve an accurate and reproducible position. This device was chosen because it has proper dimensions, is related to the analog implant dimension, has a black and opaque color, can be easily grasped by the hand during the grinding procedures, allows easy mounting of the prosthetic components, and can be sterilized due to its entirely metallic surface. We made three different marks on the chuck’s head with a metal bur for better horizontal indexing of the chuck’s head and the impression transfer assembly with the chuck’s head and scan body assembly. The connection between the chuck and the implant analog must remain fixed so the vertical housing of the transfer and the scan body will be the same.
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- An extraoral digital impression of the scan body mounted in the same analog in the transfer accessory.
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- Indexing, which involves replacement in the CAD application of the transfer abutment from the intraoral scanning with the same one scanned in the accessory device. This is so the virtual image of the accessory transfer device will be incorporated in the intraoral scan and replacement in the CAD application of the transfer abutment used intraorally with the original scan abutment, using as a reference the virtual image of the accessory transfer device.
4. Summary
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Conflicts of Interest
References
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Petre, A.E.; Drafta, S.; Oancea, L. Extraoral Scanning of Implant Prosthetic Components under Difficult Conditions Using a Transfer Device. Appl. Sci. 2022, 12, 5912. https://doi.org/10.3390/app12125912
Petre AE, Drafta S, Oancea L. Extraoral Scanning of Implant Prosthetic Components under Difficult Conditions Using a Transfer Device. Applied Sciences. 2022; 12(12):5912. https://doi.org/10.3390/app12125912
Chicago/Turabian StylePetre, Alexandru Eugen, Sergiu Drafta, and Luminita Oancea. 2022. "Extraoral Scanning of Implant Prosthetic Components under Difficult Conditions Using a Transfer Device" Applied Sciences 12, no. 12: 5912. https://doi.org/10.3390/app12125912