Fracture toughness of different adhesive/dentin interfaces analyzed by finite element stress analysis | ||||
| Egyptian Dental Journal | ||||
| Article 17, Volume 67, Issue 2 - Serial Number 4, April 2021, Page 1505-1515 PDF (1.04 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2021.58301.1454 | ||||
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| Authors | ||||
Hend Mustafa   1; Mohamed kandil 2; Tamer Nassef 3; Tarek Hussien4
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| 1Faculty of Dentistry Ain-Shams University | ||||
| 2Lecturer of Dental Materials, Faculty of Dentistry, Ain-Shams University, Cairo, Egypt | ||||
| 3Associate Professor, Computer and Software Engineering, Misr University for Science and Technology | ||||
| 4Professor, Dental materials Department, Faculty of Dentistry, Ain- Shams University | ||||
| Abstract | ||||
| Objectives: Study aimed to assess the fracture toughness of different dentin adhesive approaches and to evaluate the stress distribution at the bond interface during fracture toughness testing by finite element analysis. Materials and Methods: Specimens for chevron-notched beam fracture toughness (CNB) were prepared with dimensions of (3.0 mm × 4.0 mm × 20 mm) according to ISO 24370:2005 standard. Chevron notch was prepared at the adhesive–dentin interface using a highly polished stainless steel spacer. Four different dentin adhesives approaches were used total-etch 3 and 2 step and self-adhesives 2 and 1 step. A total of 60 specimens were prepared for each adhesive approach (n=15). Each specimen was loaded until failure in a 4-point bend test setup and the fracture toughness was calculated according to the ISO specifications. Finite element modeling of the specimens was carried out in order to analyze stress distribution during fracture toughness testing. Data were analyzed by one-way ANOVA followed by tukey‘s post hoc test with significant level at p < 0.001 level (p= 0.0001).. Results: Solobond plus 3-step etch-and-rinse showed the highest mean fracture toughness (1.78 MPam1/2) Whereas, Futurabond M+ 1-step self-etch showed the lowest value (1.13 MPam1/2). These finding were supported by finite element analysis which showed stresses to concentrate at the adhesive–dentin interface during fracture toughness loading and crack propagation. Conclusion: The adhesive approach has a strong effect on the fracture toughness of the adhesive–dentin interface. the 3-step etch-and-rinse approach showing the highest mean fracture toughness while 1-step self-etch approach showing the lowest value. | ||||
| Keywords | ||||
| Fracture toughness; CNB; Adhesives; Dentin; Finite element analysis | ||||
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