Publication: Marginal adaptation and fracture resistance of milled and 3D-printed CAD/CAM hybrid dental crown materials with various occlusal thicknesses
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Issued Date
2024-01-01
Resource Type
ISSN
18831958
eISSN
22124632
Scopus ID
2-s2.0-85190312140
Pubmed ID
37438119
Journal Title
Journal of Prosthodontic Research
Volume
68
Issue
2
Start Page
326
End Page
335
Rights Holder(s)
SCOPUS
Bibliographic Citation
Journal of Prosthodontic Research Vol.68 No.2 (2024) , 326-335
Suggested Citation
Suksuphan P., Krajangta N., Didron P.P., Wasanapiarnpong T., Rakmanee T. Marginal adaptation and fracture resistance of milled and 3D-printed CAD/CAM hybrid dental crown materials with various occlusal thicknesses. Journal of Prosthodontic Research Vol.68 No.2 (2024) , 326-335. 335. doi:10.2186/jpr.JPR_D_23_00089 Retrieved from: https://hdl.handle.net/20.500.14740/20285
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Corresponding Author(s)
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Abstract
Purpose: To evaluate the marginal adaptation and fracture resistance of three computer-aided design/computer-assisted manufacturing hybrid dental materials with different occlusal thicknesses. Methods: Ninety single-molar crowns were digitally fabricated using a milled hybrid nanoceramic (Cerasmart, CE), polymer-infiltrated ceramic network (PICN, Vita Enamic, VE), and 3D-printed materials (Varseosmile, VS) with occlusal thicknesses of 0.8, 1, and 1.5 mm (10 specimens/group). Anatomical 3D-printed resin dies (Rigid 10K) were used as supporting materials. A CEREC MCX milling unit and a DLP-based 3D printer, Freeform Pro 2, were utilized to produce the crown samples. Before cementation, the marginal adaptation, absolute marginal discrepancy (AMD), and marginal gap (MG) were assessed using micro-CT scanning. After cementation with self-adhesive resin cement, fracture resistance was evaluated using a universal testing machine. The number of fractured crowns and the maximum fracture values (N) were recorded. Data were statistically analyzed using both one-and two-way ANOVA, followed by Tukey’s honestly significant difference (HSD) test. Results: For all occlusal thicknesses, the VS crowns demonstrated the lowest AMD and MG distances, significantly different from those of the other two milling groups (P < 0.05), whereas CE and VE did not differ significantly (P > 0.05). All VS crowns were fractured using the lowest loading forces (1480.3±226.1 to 1747.2±108.7 N). No CE and 1 and 1.5 mm VE crowns fractured under a 2000 N maximum load. Conclusions: All hybrid-material crowns demonstrated favorable marginal adaptation within a clinically acceptable range, with 3D printing yielding superior results to milling. All materials could withstand normal occlusal force even with a 0.8 mm occlusal thickness.