Fracture behavior of short fiber-reinforced CAD/CAM inlay restorations after cyclic fatigue aging

• Published in: Odontology 2024-01, Vol.112 (1), p.138-147
• Main Authors: Garoushi, S., Barlas, D., Vallittu, P. K., Uctasli, M. B., Lassila, L.
• Format: Article
• Language: English
• Subjects: Aging; Composite Resins - chemistry; Computer-Aided Design; Crack propagation; Dental Caries; Dental Stress Analysis; Dentistry; Humans; Inlays - methods; Materials fatigue; Materials Testing; Medicine; Molar; Molars; Oral and Maxillofacial Surgery; Original; Original Article; Teeth; Variance analysis
• ISSN: 1618-1247; 1618-1255
• DOI: 10.1007/s10266-023-00815-y

[Abstract] The aim of this study was to assess the fracture behavior of molar teeth restored with MOD inlays made of experimental short fiber-reinforced CAD/CAM composite block (SFRC CAD) before and after cyclic fatigue aging. Standardized MOD cavities were prepared on 60 intact mandibular molars. Three groups of CAD/CAM made inlay restorations (Cerasmart 270, Enamic, and SFRC CAD) were fabricated (n=20/group). All restorations were luted with self-adhesive dual-cure resin cement (G-Cem One). Half of restored teeth per each group (n=10) were quasi-statically loaded until fracture without aging. The other half underwent cyclic fatigue aging for 500,000 cycles (Fmax=150 N) before being loaded quasi-statically until fracture. Then, the fracture type was visually inspected. The microstructure and elemental content of CAD/CAM materials were assessed using SEM and EDS. Two-way analysis of variance (ANOVA) was used to statistically examine the data, and it was followed by the Tukey HSD test (α=0.05). ANOVA demonstrated that both material type and aging had a significant effect (p