:sharpen(level=0):output(format=jpeg)/up/dt/2025/04/Digital-workflows-for-conversion-prostheses_New-Africa_AdobeStock_520195567.jpg?ssl=1 "Dental Information – Virtual workflows for conversion prostheses in full-arch implant dentistry")
:sharpen(level=0):output(format=webp)/up/dt/2025/04/Digital-workflows-for-conversion-prostheses_Fig-1.png "Fig. 1: Initial situation.")
Fig. 1: Preliminary scenario.
Conventionally, a denture is transformed to a direct implant-supported brief recovery after the implants are positioned. In short, generating a standard pick-up conversion prosthesis calls for finding the implants relative to the denture, drilling holes within the denture on the implant places and attaching the brief abutments to the denture.5, 6 As soon as the implant abutments were luted to the denture, it’s got rid of from the mouth. Flanges are lower, voids are crammed and the intaglio floor is adjusted to deal with any bone aid that can have befell and to mold the tissue in a undeniable form, relying at the design of the prosthesis. Afterwards, the prosthesis is inserted into the mouth. This complete procedure may also be very tedious, messy and time-consuming.7
With virtual generation in modern day dentistry, the method of fabricating a direct conversion prosthesis may also be a lot progressed—in relation to each affected person convenience and scientific potency. This text will provide two circumstances to exhibit a virtual workflow for dentate (Fig. 1) and edentulous sufferers the use of intra-oral scanning and virtual instrument to manufacture the conversion prosthesis.
Partly dentate case
The virtual procedure begins with a virtual wax-up lengthy sooner than the day of surgical operation. Correct making plans for any case is important to remedy luck. As soon as the enamel positioning has been finalised, a surgical plan may also be installed position for implant placement. The digital wax-up is stored and shall be wanted at the day of surgical operation for the virtual conversion (Figs. 2a & b).
Crucial issue for virtual conversion at the day of surgical operation is sequencing of each the surgical operation (extractions and implant placement) and the intra-oral scans. Some of the advantages of virtual generation is the power to merge commonplace issues from one scan to the following. The foundation of the conversion is the right kind merging of the implant scan at the day of surgical operation with the preoperative scan, thus finding the unique wax-up at the new implant scan. If no reference issues exist between the unique scan and the implant scan, there shall be problem in merging the 2 scans, and the brand new implant scan shall be misplaced in 3D area and not using a technique to reference it again. Thus, you will need to resolve the reference issues previous to surgical operation with a right kind plan. For circumstances the place the affected person remains to be dentate or partly dentate, selective extractions and protecting of explicit enamel for reference is a simple technique to allow correct merging of the scans with the preoperative scan.
As soon as the scans were merged (Figs. 3a-d), the unique wax-up may also be referenced to the brand new implant scan. The usage of dental instrument (DentalCAD, exocad), the conversion prosthesis may also be designed by way of connecting the enamel within the wax-up to the implants. This procedure normally takes roughly 30 mins as a result of lots of the design time is going into design of the wax-up previous to surgical operation (Figs. 4a-d). After the virtual conversion, the prosthesis is 3D-printed, processed and inserted directly to the in an instant positioned implants (Figs. 5 & 6).
:sharpen(level=0):output(format=webp)/up/dt/2025/04/Digital-workflows_fig-7.png "Figs. 7a & b: Relined maxillary (a) and mandibular trial prostheses (b). Cutouts in the prosthesis allow it to be scanned intra-orally with reference points.")
Figs. 7a & b: Relined maxillary (a) and mandibular trial prostheses (b). Cutouts within the prosthesis permit it to be scanned intra-orally in regards issues.
Edentulous case
For edentulous circumstances, a tribulation prosthesis remains to be important as a way to check enamel positioning and vertical measurement previous to surgical operation like you may do with some other edentulous case. This trial prosthesis (which is product of the virtual wax-up) additionally doubles so that you can attach the implant scan again to the virtual wax-up (Figs. 7a & b).
Since cushy tissue is typically no longer dependable as a reference, particularly all the way through or after full-arch implant surgical operation, reference issues should be positioned for the aim of merging. Those reference issues may also be any type of brief screw that may be embedded within the bone for surgical operation. Examples come with brief anchorage units (TADs) or camping screws. The enamel of the trial prosthesis may also be merged with the second one (period in-between) scan. The TADs in the meanwhile scan may also be merged with the 3rd (ultimate, implant) scan (Figs. 8a-c & 9a-c). Thus, the implant scan may also be comparable again to the unique scan. The similar virtual procedure as for the dentate affected person is then repeated, and the prosthesis is 3D-printed and inserted at the identical day as surgical operation (Figs. 10a-d, 11a & b).
Conclusion
The development of latest virtual applied sciences has enabled the conversion procedure to be cleaner, extra streamlined and extra predictable. The greater accuracy of intra-oral scanners, progressed functions of dental instrument and greater power of 3D-printed fabrics all play a task in those developments. Because the virtual panorama continues to switch, it’s a thrilling time to look what important enhancements in each affected person convenience and care in addition to dental scientific skillability may also be completed.
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