:sharpen(level=0):output(format=jpeg)/up/dt/2024/11/Shutterstock_2351651213.jpg?w=1200&fit=1200,627&ssl=1 "The most productive of each worlds")
:sharpen(level=0):output(format=webp)/up/dt/2024/11/A-hybrid-digital%E2%80%93analogue-workflow_1_Fig-18b1.jpg "Fig. 1: Full-face view of the initial situation.")
Fig. 1: Complete-face view of the preliminary scenario.
When designing a full-arch implant-supported prosthesis, optimum implant positioning is decided no longer most effective via the to be had bone construction but in addition via the prosthetic design, which accounts for occlusion, aesthetics and soft-tissue anatomy.1 Making plans starts with knowledge acquisition and might come with extra-oral and intra-oral virtual images, intra-oral scans, facial scans and CBCT imaging. This knowledge is used to formulate a facially pushed remedy plan that accounts for supreme incisal edge place, lip dynamics and affected person personal tastes.2 The STL record from the intra-oral scan and the DICOM record from the CBCT scan can also be superimposed in implant making plans device to design a surgical information and provisional prosthesis, which can also be fabricated the usage of additive or subtractive production. It’s crucial that the surgical information is stabilised to forestall any motion throughout surgical treatment, and continuously anchor pins are included into the design to score the best stage of surgical accuracy.3 As soon as the implants had been positioned and number one balance showed, the prefabricated provisional prosthesis can also be picked up intra-orally with resin and finalised extra-orally whilst the sutures are positioned. This gives the affected person rapid aesthetics and serve as, making improvements to the whole revel in.
Attaining a passive have compatibility is a key issue within the luck of implant-supported fastened prostheses. Misfit can result in each mechanical and organic headaches reminiscent of screw loosening, part fracture and bone loss.4 Throughout affect taking, it will be significant to correctly switch the implant positions to the type to verify a passive have compatibility.5 Whilst a completely virtual preoperative workup is effective to each sufferers and clinicians, the overall step of the full-arch remedy (i.e. the definitive prosthesis) has confronted demanding situations with a virtual workflow. Intra-oral scanners have proven clinically applicable accuracy when compared with standard impressions for unmarried crowns and short-span fastened prostheses.6 Alternatively, standard impressions are extra correct for full-arch implant-supported prostheses than is intra-oral scanning era.7, 8 Whilst the era continues to conform and more-recent literature has proven similar effects between the 2 affect modalities, it is going to nonetheless be smart to workout warning when digitally shooting full-arch implant impressions, because the accuracy very much depends upon the scanning technique and lots of research had been inconclusive.9
This example document demonstrates a hybrid virtual–analogue workflow for the design and fabrication of a full-arch implant-supported fastened maxillary prosthesis. Through combining technological advances in virtual dentistry for making plans a predictable surgical treatment and provisional prosthesis with the gold usual standard affect methodology for fabricating the definitive prosthesis, the affected person skilled the most productive of each worlds in his or her care and remedy end result.
Case document
A 65-year-old feminine affected person introduced with maxillary terminal dentition, in quest of a hard and fast approach to substitute her lacking and failing enamel (Fig. 1). Her maxillary arch have been rehabilitated 20 years ahead of with a mixture of crowns and bridges, and lots of of her enamel have been extracted inside the remaining two years owing to recurrent caries. A maxillary partial acrylic denture have been fabricated on the time to switch the extracted enamel; alternatively, she used to be by no means pleased with this prosthesis and used it in social scenarios most effective (Figs. 2a-b & 3a-b). She introduced with most effective 4 final maxillary enamel, two of which had huge recurrent caries and had been deemed unrestorable. Even if closely restored, her herbal mandibular dentition used to be nonetheless intact, however there used to be recurrent caries on all anterior enamel.
After discussing each detachable and stuck choices, the affected person made up our minds to continue with extraction of the remainder maxillary enamel and site of six implants to beef up a full-arch fastened prosthesis. The recurrent caries at the mandibular enamel could be restored with direct composite resin restorations ahead of injection moulding to stage out the mandibular occlusal airplane (Figs. 4a & b).
After complete exam, periodontal review, and scaling and root planing, an preliminary smile design used to be carried out the usage of full-face images to resolve the best incisal edge place. Each arches had been scanned with an intra-oral scanner (TRIOS 3, 3Shape) for a virtual wax-up in accordance with the initial smile design. This information used to be merged with a facial scan to generate a facially pushed remedy plan. An intra-oral mock-up used to be carried out the usage of a Three-D-printed prototype of the virtual wax-up to evaluate aesthetics and higher lip beef up and not using a flange (Figs. 5a-c). Owing to over the top lip mobility and a top smile line, the plan used to be to manufacture a Misch classification FP-1 (and not using a red within the design; Fig. 6a & b). Because the transition line may just no longer be hidden with out really extensive bone removing, the affected person authorised a prosthetic design with lengthy enamel. As soon as the design have been authorized, fiducial markers had been positioned at the prototype and scanned intra-orally. This used to be adopted via a CBCT scan. The ensuing STL and DICOM information had been merged in implant making plans device (coDiagnostiX, Dental Wings) for restoratively pushed implant making plans. This used to be used to provide an anchor pin information, pin-retained surgical information and pin-retained provisional prosthesis with get admission to holes for pickup (Figs. 7a-c).
When making plans a full-arch case, now we have the problem of figuring out the place probably the most supreme implant places could be. It is very important steadiness the anterior–posterior unfold with the anatomical boundaries that the affected person items with. Whilst the revealed luck charges usually seem to be very identical between tilted implants and immediately implants relating to failure fee and marginal bone loss over 3 years in serve as,10 the position of tilted implants is a lot more delicate to methodology.11 It is very important deal with symmetry of implant placement for equivalent pressure at the implants and to regulate the cantilevers. On this case, it used to be decided that when osseous aid there could be no or minimum local bone final across the distal implants. Anterior–posterior unfold will have to be decided via bone high quality, quantity and distribution of implants, rehabilitation design and prosthetic subject material,12 and on this case, extending to the primary molars used to be deemed suitable.
On the time of implant surgical treatment, the tooth-supported anchor pin information used to be attempted in and whole seating showed during the home windows included into the design (Figs. 8a & b). After the 4 anchor pins have been inserted, the remainder maxillary enamel had been extracted and a mucoperiosteal flap used to be raised previous to striking the pin-retained surgical information (Figs. 9a & b). Implants had been positioned in websites #15, 13, 11, 21, 23 and 25 (Bone Stage Tapered Implant, Roxolid, Straumann), implants #15 and 25 being angled to steer clear of sinus grafting. Number one balance used to be showed in any respect websites with the exception of website online #23, which used to be handled as a two-stage surgical treatment and omitted of the provisional prosthesis. Angled multi-unit abutments (SRA, Straumann) had been connected to the 5 solid implants (Fig. 10), adopted via insertion of transient abutments in preparation for pickup (Figs. 11 & 12). The provisional prosthesis used to be then positioned the usage of anchor pins and due to this fact connected to the transient abutments with flowable composite resin (Figs. 13a & b). Minor occlusal changes had been made ahead of removing of the provisional prosthesis for completing and sprucing whilst the surgical websites had been sutured (Figs. 14 & 15). The provisional prosthesis used to be reinserted, and postoperative directions got (Figs. 16a & b).
After 4 months of therapeutic, osseointegration used to be showed, and second-stage surgical treatment used to be carried out at website online #23. A initial closed-tray affect used to be thinking about polyvinylsiloxane for the fabrication of a customized open tray. The overall affect used to be captured the usage of an open-tray methodology with splinted affect copings (Fig. 17). A verification jig used to be designed and Three-D-printed from the scanned grasp forged and re-luted intra-orally with Triad gel (Dentsply Sirona; Fig. 18). Passive have compatibility at the grasp forged used to be showed with the one-screw check. A brand new prototype with a hybrid FP-1–FP-3 design used to be milled from polymethylmethacrylate to evaluate whether or not a extra fulfilling aesthetic end result might be completed, figuring out that the red transition line is also visual within the anterior (Figs. 19a & b). The affected person most popular the brand new design, because the anterior enamel had been extra proportionate and the gingival colour mixed smartly along with her herbal tissue (Figs. 20a & b). The definitive prosthesis used to be milled from monolithic zirconia, and a maxillary evening guard used to be equipped on the ultimate insertion appointment (Figs. 21a-c).
:sharpen(level=0):output(format=webp)/up/dt/2024/11/A-hybrid-digital%E2%80%93analogue-workflow_21c_Fig-18b2.jpg "Figs. 21c: Definitive prosthesis. Intra-oral view. Full-face view.")
Figs. 21c: Definitive prosthesis. Intra-oral view. Complete-face view.
Dialogue
The hybrid virtual–analogue workflow introduced on this paper shows the merging of virtual developments with standard tactics to optimise the rehabilitation of a affected person with terminal dentition. This method complements the predictability and luck of full-arch implant-supported prostheses via addressing the inherent boundaries of each strategies when utilized in isolation. Precision and potency had been higher considerably in fashionable implant dentistry thru virtual making plans and guided surgical treatment. The affected person’s postoperative revel in can also be very much stepped forward with rapid placement of a provisional prosthesis, restoring serve as and aesthetics at the day of surgical treatment.
In spite of the benefits of virtual era, the verdict to make use of an analogue methodology for the definitive prosthesis underscores the present boundaries of intra-oral scanners for full-arch implant-supported prostheses. This example demonstrates how combining virtual and standard strategies can streamline the workflow and cut back the danger of headaches from wrong implant placement or a non-passive have compatibility.
Affected person comments and prototype trying out had been an important in refining the prosthetic design ahead of fabrication of the definitive prosthesis. This flexibility within the remedy plan created a extra aesthetically fulfilling end result and stepped forward general affected person pride.
Conclusion
Using dental implants can give life-changing remedy for edentulous sufferers. Cautious case variety and making plans are key to acquiring optimum effects. This example document illustrates the efficient use of a hybrid virtual–analogue workflow for rehabilitating a affected person with maxillary terminal dentition. Through combining virtual tactics reminiscent of intra-oral scanning, CBCT imaging and facial scanning with standard splinted open-tray impressions, the remedy completed actual implant placement and ensured a passive have compatibility of the definitive prosthesis. Total, this hybrid method highlights some great benefits of integrating virtual and standard strategies in complicated full-arch rehabilitation. As virtual applied sciences proceed to conform, additional comparative research are required to determine standardised protocols that take complete good thing about those inventions in medical observe.
Acknowledgements
We wish to thank our instructors, Drs Anthony McCullagh and Mohamed Gebril, for his or her medical steerage.
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