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CC BY 4.0 · Eur J Dent
DOI: 10.1055/s-0044-1795116
Original Article

Accuracy, Reproducibility, and Gaps in Different Angulations of 3D-Printed versus Milled Hybrid Ceramic Crown

Nadaprapai Khwanpuang
1   Division of Restorative Dentistry, Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand
,
Chayaporn Suphachartwong
1   Division of Restorative Dentistry, Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand
,
Awiruth Klaisiri 
1   Division of Restorative Dentistry, Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand
2   Thammasat University Research Unit in Restorative and Esthetic Dentistry, Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand
,
Seelassaya Leelaponglit
1   Division of Restorative Dentistry, Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand
2   Thammasat University Research Unit in Restorative and Esthetic Dentistry, Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand
,
Chayanit Angkananuwat
3   Division of Prosthodontic Dentistry, Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand
,
Nantawan Krajangta 
1   Division of Restorative Dentistry, Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand
2   Thammasat University Research Unit in Restorative and Esthetic Dentistry, Faculty of Dentistry, Thammasat University, Pathum Thani, Thailand
› Institutsangaben Funding This study was supported by the Faculty of Dentistry, Thammasat University Research Fund, contract No 2/2565.
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Abstract

Objectives This article compared the accuracy, reproducibility, and gap of crowns resulting from variations in print angulation of three-dimensional (3D)-printed VarseoSmile Crownplus (VS) and milled resin-ceramic hybrid materials (Cerasmart 270, CS, and Enamic, E).

Materials and Methods A total of 60 specimens, consisting of VS printed at four different angulations (30, 45, 60, and 90 degrees), along with CS and E were investigated. External and internal accuracy and reproducibility were measured with the 3D deviation analysis. External and internal gaps were measured with the silicone replica technique. The results were analyzed using Welch's one-way analysis of variance with Dunnett T3 post hoc comparison at p ≤ 0.05.

Results Across all groups, external and internal accuracy were 0.55 to 20.02 μm and external and internal reproducibility were 0.05 to 0.69 μm. Overall external accuracy was not significant (p = 0.063), whereas significance was noted in overall internal accuracy and reproducibility among groups (p < 0.001). External and internal gaps were 33.76 to 93.11 μm. Statistically significant differences were found in internal and external gaps among groups (p < 0.001), with milled crowns demonstrating larger internal and smaller external gaps than 3D-printed crowns. Within the 3D-printed group, statistically, 90-degree angles exhibited the smallest external and internal gaps.

Conclusion Both milled and 3D-printed methods achieved clinically acceptable accuracy, reproducibility, and gap dimensions, offering viable options for hybrid ceramic crown restoration. Among 3D-printed crowns, the 90-degree printing angle group exhibited satisfactory accuracy and reproducibility, alongside the best internal and external fit.

Keywords

CAD/CAM - 3D printed - accuracy - reproducibility

Conclusion

The study concludes that both milled and 3D-printed, regardless of angulation, met clinically acceptable standards for accuracy, reproducibility, and gap measurements. Among 3D-printed crowns, those at a 90-degree angle exhibited the best internal and external gaps and were easiest to position.




Publikationsverlauf

Artikel online veröffentlicht:
30. Dezember 2024

© 2024. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

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