Schmidt, Michael Benno and Hahnel, Sebastian and Rauch, Angelika and Rosentritt, Martin (2025) Influence of surface treatment on roughness, fracture force, flexural strength, and dynamic loading of a 3D-printed crown and bridge material. CLINICAL ORAL INVESTIGATIONS, 29 (9): 426. ISSN 1432-6981, 1436-3771
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Objectives: To investigate how surface treatment affects fracture force, flexural strength, and dynamic loading cycles until failure of 3D-printed restorations. Materials and methods: Specimens (7 groups; n = 8 per group) were 3D-printed from an acrylate-based crown and bridge material. After cleaning and post-polymerization, specimens were treated with either silicon carbide paper (1000 grit; 1000/4000 grit) or blasting (Al2O3; 1 bar/125 mu m; 2 bar/125 mu m; 1 bar/250 mu m) to simulate laboratory treatment. Surface roughness (Arithmetic mean Sa/maximum roughness height Sz; ISO 25178-2); fracture force (FF) and biaxial flexural strength (BFS; ISO 6872) were determined. The number of dynamic load cycles (LC) to failure was determined under cyclic loading in a BFS staircase approach. Statistics: ANOVA, Bonferroni-test, Kaplan-Meier survival, Pearson correlation; alpha = 0.05. Results: BFS ranged between 94.4 MPa and 199.9 MPa, FF between 260.6 N and 428.6 N and Sa/Sz between 0.0/1.0 mu m and 1.8/18.4 mu m. BFS, FF and Sa/Sz showed significant differences between the treatments (p < 0.001) and individual groups (p <= 0.013). Mean LC ranged between 204,364 and 267,637 cycles. ANOVA comparisons (p = 0.706) and Log Rank test (Chi(2): 10,835; p = 0.094; Fig. 2) revealed no significant differences between the loading cycles. Surface treatment with either silicon carbide papers or blasting protocols had a significant influence on FF, BFS, Sa, and Sz, but not on LC. Conclusions: Surface treatment affected the fracture force and biaxial fracture strength of a 3D-printed crown. It showed no influence on the long-term dynamic behavior.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RESIN; FATIGUE; CONVERSION; BEHAVIOR; SPLINT; Surface treatment; Roughness; Fracture force; Flexural strength; Dynamic loading; 3D-printing; Additive manufacturing |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Zahnärztliche Prothetik |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Jun 2026 08:49 |
| Last Modified: | 16 Jun 2026 08:49 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66093 |
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