Clinical Acceptance of Digitally Produced Zirconia and Metal Post and Cores, Based on the Impression Method
Abstract
:1. Introduction
2. Materials and Methods
- 1.
- Following the completion of endodontic treatment, gutta-percha removal from the tooth is performed using burs (Gates Glidden, Pulpdent Corp., Watertown, MA, USA) to achieve the desired post length, ensuring the preservation of the apical seal.
- 2.
- The coronal aspect of the tooth is then prepared to eliminate acute angles between the post surfaces and the apical surface of the core. This adjustment facilitates optimal reading by the intraoral scanner at the core-post junction. Special attention is given to ensuring that the core-post junction possesses sufficient width to prevent fracture during the milling of zirconia. Additionally, the post is shaped with rounded internal line angles where it interfaces with the tooth surfaces.
- 3.
- A fully digital workflow was implemented for each zirconia or metal post. The digital post impression was captured using an intraoral scanner (TRIOS 4, 3Shape, Copenhagen, Denmark) and the completeness of the digital impression of the prepared root canal was verified on the scanner’s display. Also, the rules of taking a good TRIOS scan were respected according with the manufacturer’s recommendations, and the clinician dried the teeth well before scanning [17].
- 4.
- The STL dataset was utilized to design the post and core in CAD software (Exocad 3.1 Rijeka, EXOCAD GmbH, Darmstadt, Germany). The cement gap parameter was set to 50 µm.
- 5a.
- After completing the design, the STL files of the post and cores were transmitted to the 5-axis milling machine (CORiTEC® 250i Loader PRO, Imes Icore GmbH, Eiterfeld, Germany) to mill the zirconia disk (Luxen, Dentalmax, Cheonan-si, Republic of Korea). Subsequently, the attachment points of the post to the CAD/CAM disk were cut and smoothed. The posts underwent sintering in a zirconia furnace (AUSTROMAT Series 6, DEKEMA Dental-Keramiköfen GmbH, Salzburg, Germany) for 11 h at a maximum temperature of 1530 °C.
- 5b.
- Upon finalizing the design, STL files of the post and cores were transferred to the 3D metal printer (MySint100, Sisma, Vicenza, Italy), employing Cr-Co powder for the laser sintering of metal posts. Subsequently, attachment points of the printed post underwent cutting and smoothing.
- 1.
- Following endodontic therapy, gutta-percha removal utilized burs (Gates Glidden, Pulpdent Corp., Watertown, MA, USA) to achieve the desired post length, preserving the apical seal.
- 2.
- The coronal aspect underwent preparation to eliminate acute angles between post surfaces and the core’s apical surface. This adjustment optimized the flow of impression material, with a focus on ensuring a sufficiently wide core-post junction to prevent fractures during zirconia milling.
- 3.
- Impression recording for post and core preparation involved addition silicone impression material (Elite HD, Zhermack, Badia Polesine, Italy). The silicone was injected into the canal with a disposable dispenser. In addition, alginate (Hydrogum 5, Zhermack, Badia Polesine, Italy) recorded antagonists, while bite registration silicone (Occlufast, Zhermack, Badia Polesine, Italy) recorded intermaxillary relations. Arch impressions were promptly sent to the dental laboratory and poured into plaster models (Elite Rock, Zhermack, Badia Polesine, Italy). For assuring the quality and precision of the plaster models, technicians respected the instructions for use from the manufacturer: water/powder ratio of 20 mL/100 g, 12 min working time, 14 min setting time for a 2 h setting expansion of 0.08%.
- 4.
- From this point, the workflow became digital, scanning the plaster models with a laboratory scanner (Medit T510, Medit, Seoul, Republic of Korea).
- 5.
- The STL dataset facilitated post and core design in CAD software (Exocad Rijeka, EXOCAD GmbH, Darmstadt, Germany). The cement gap parameter was set at 50 µm.
- 6a.
- After completing the design, the STL files of the zirconia post and cores were transmitted to the 5-axis milling machine (CORiTEC® 250i Loader PRO, Imes Icore GmbH, Eiterfeld, Germany) to mill the zirconia disk (Luxen, Dentalmax, Republic of Korea). Subsequently, the attachment points of the post to the CAD/CAM disk were cut and smoothed. The posts underwent sintering in a high-speed furnace (AUSTROMAT Series 6, DEKEMA Dental-Keramiköfen GmbH, Salzburg, Germany) for 11 h at a maximum temperature of 1530 degrees.
- 6b.
- Upon finalizing the design, STL files of the post and cores were transferred to the 3D metal printer (MySint100, Sisma, Vicenza, Italy), employing Cr-Co powder for the laser sintering of metal posts. Subsequently, attachment points of the printed post underwent cutting and smoothing.
3. Results
4. Discussion
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Perlea, P.; Stefanescu, C.; Petre, A.E. Clinical Acceptance of Digitally Produced Zirconia and Metal Post and Cores, Based on the Impression Method. Clin. Pract. 2024, 14, 2533-2541. https://doi.org/10.3390/clinpract14060199
Perlea P, Stefanescu C, Petre AE. Clinical Acceptance of Digitally Produced Zirconia and Metal Post and Cores, Based on the Impression Method. Clinics and Practice. 2024; 14(6):2533-2541. https://doi.org/10.3390/clinpract14060199
Chicago/Turabian StylePerlea, Paula, Cosmin Stefanescu, and Alexandru Eugen Petre. 2024. "Clinical Acceptance of Digitally Produced Zirconia and Metal Post and Cores, Based on the Impression Method" Clinics and Practice 14, no. 6: 2533-2541. https://doi.org/10.3390/clinpract14060199
APA StylePerlea, P., Stefanescu, C., & Petre, A. E. (2024). Clinical Acceptance of Digitally Produced Zirconia and Metal Post and Cores, Based on the Impression Method. Clinics and Practice, 14(6), 2533-2541. https://doi.org/10.3390/clinpract14060199