Digital Mounting Jigs: A Novel Technique
Abstract
:1. Introduction
2. Technique
- Mount the diagnostic casts in CR at the desired VDO on a mechanical articulator using a facebow transfer and program the articulator to simulate the patient’s eccentric movements.
- Scan the maxillary and mandibular casts individually via desktop scanner (E4 Scanner; 3Shape, Copenhagen, Denmark) to obtain Standard Tessellation Language (STL) files, and then scan the articulator mounting (jaw relation record) to virtually relate the STL files (Figure 1a).
- Prepare patient’s mandibular teeth while ensuring that the maxilla remains unchanged. Using an intraoral scanner (TRIOS3; 3Shape, Copenhagen, Denmark), make a final impression of the unprepared maxillary and prepared mandibular arches followed by jaw relations records in CR at the pre-determined VDO (Figure 1b).
- Prepare the maxillary teeth and make a final impression scan of the prepared maxilla and mandible and jaw relation records in CR while maintaining the same VDO (Figure 1c). Import the STL files of all three sets of scans into MeshMixer (Autodesk MeshMixer; Autodesk Inc., San Rafael, CA, USA) and begin the virtual alignment procedure.
- 5.
- Align the unprepared maxillary/prepared mandibular casts to the diagnostic casts by using the maxilla as a reference (Figure 2a). Then, align the working casts of both prepared arches to the unprepared maxillary/prepared mandibular casts using the mandibular preparations as a reference (Figure 2b). The three sets of scans should now be virtually aligned. After alignment, hide the scan of the unprepared maxillary/prepared mandibular arches as it is no longer required.
- 6.
- Append a rectangular block with a thickness of 2–5 mm, depending on the available inter-arch space, and place it between both arches. Akin to analog interocclusal records, the rectangular block extends to register the cusp/prep tips. Hide the mandibular working cast and reveal the original mandibular diagnostic cast to have it oppose the maxillary working cast.
- 7.
- Combine the maxillary working cast and the mandibular diagnostic cast by selecting both layers simultaneously and selecting ‘combine’ on the upper left side bar (Figure 3).
- 8.
- From the object viewer, select the combined casts and the rectangular block layers. The Boolean difference option will appear on the upper left side bar. This feature works by subtracting objects in areas where they intersect; thus, a digital bite registration is made between the maxillary working cast on the upper surface and the mandibular diagnostic cast on the lower surface. This forms ‘digital mounting jig #1’ that can now be exported and printed (Figure 4a).
- 9.
- Export digital mounting jig #1 by going to file > export and proceed with the 3D printing process on your printer of choice, using any of the model resins. Follow post-processing and curing instructions recommended by the manufacturer for the resin and curing unit used (Figure 4b).
- 10.
- Seat the jig onto the previously mounted mandibular diagnostic cast, which is preserving the 3-dimensional spatial relationship, and place the printed maxillary working cast on the opposing surface. Mount the maxillary working cast to the mechanical articulator (Figure 5).
- 11.
- Fabricate ‘digital mounting jig #2’ to mount the mandibular working cast. Append a new rectangular block between the two working casts and follow the same steps. Once the casts are combined, perform a Boolean difference to create jig #2 and proceed to printing.
- 12.
- 13.
- Adjust centric and eccentric contacts on the wax-up, provisional, or definitive restorations fabricated digitally onto the mechanical articulator until they are deemed satisfactory.
3. Discussion
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Akl, M.A.; Mansour, D.E.; Zheng, F.; Seong, W. Digital Mounting Jigs: A Novel Technique. Digital 2022, 2, 164-170. https://doi.org/10.3390/digital2020010
Akl MA, Mansour DE, Zheng F, Seong W. Digital Mounting Jigs: A Novel Technique. Digital. 2022; 2(2):164-170. https://doi.org/10.3390/digital2020010
Chicago/Turabian StyleAkl, Mohammed A., Dina E. Mansour, Fengyuan Zheng, and WookJin Seong. 2022. "Digital Mounting Jigs: A Novel Technique" Digital 2, no. 2: 164-170. https://doi.org/10.3390/digital2020010