IADR Abstract Archives
Bulk-Fill and Bioactive Innovations on Low-Viscosity Composites Under Erosive Challenge
Objectives: Low-viscosity resin composites (RC) are materials that can offer clinical versatility, in particular when low-shrinkage monomers and/or bioactive ingredients are introduced towards the improvement of their properties and manipulation characteristics. This study aimed to investigate the flexural resistance (σ) and elastic modulus (E) of low-viscosity RCs categorized as traditional or bulk-fill systems combined or not with bioactive ingredients after an artificial erosive simulation cycle.
Methods: Experimental design involved the factors: 1- Materials (5 levels): Gold Label 2 (GL), Filtek Supreme Flowable Restorative (FSF), Filtek Bulk Fill Flowable Restorative (FBF), Beautifil Flow Plus F00 (F00) and Beautifil Bulk Flowable (BBF); 2- Condition (2 levels): artificial saliva (C); artificially eroded-orange juice (E), and 3- Time (2 levels): initial and 5 day- cycling. Bar-specimens (n=10/ 12x2x2 mm) were subjected to a 3-point flexural-strength test to record the maximum fracture load to calculate σ and E (500 N, 0.5 mm/ min). Degree of conversion (DC) was assessed without the erosive condition (n=6) using Fourier Transform Infrared Spectroscopy (FTIR/ATR), before and 24 h after photoactivation.
Results: For σ, material and the interaction between condition were statistically significant (p<0.001). With exception of GL, all materials presented similar behavior under control condition (p<0.05), while GL and F00 presented statically significant lower values after erosive challenge. Comparing both conditions, only F00 decreased significantly (p<0.05). For E, material (p=0.0007) and condition (p=0.0144) were statistically significant, without significant interaction. Under both conditions, GL, F00 and FBF had statistically lower E than BBF, while FSF did not differ to any material. After erosive cycle, all materials presented higher E. For DC, GL showed higher DC compared to RCs without bioactive technology (FSF and FBF).
Conclusions: In conclusion, the combination of low-shrinkage monomers and bioactive contents to RCs determines a variety performance of low-viscosity RCs under erosive challenge with acceptable parameters to be clinically employed.
Methods: Experimental design involved the factors: 1- Materials (5 levels): Gold Label 2 (GL), Filtek Supreme Flowable Restorative (FSF), Filtek Bulk Fill Flowable Restorative (FBF), Beautifil Flow Plus F00 (F00) and Beautifil Bulk Flowable (BBF); 2- Condition (2 levels): artificial saliva (C); artificially eroded-orange juice (E), and 3- Time (2 levels): initial and 5 day- cycling. Bar-specimens (n=10/ 12x2x2 mm) were subjected to a 3-point flexural-strength test to record the maximum fracture load to calculate σ and E (500 N, 0.5 mm/ min). Degree of conversion (DC) was assessed without the erosive condition (n=6) using Fourier Transform Infrared Spectroscopy (FTIR/ATR), before and 24 h after photoactivation.
Results: For σ, material and the interaction between condition were statistically significant (p<0.001). With exception of GL, all materials presented similar behavior under control condition (p<0.05), while GL and F00 presented statically significant lower values after erosive challenge. Comparing both conditions, only F00 decreased significantly (p<0.05). For E, material (p=0.0007) and condition (p=0.0144) were statistically significant, without significant interaction. Under both conditions, GL, F00 and FBF had statistically lower E than BBF, while FSF did not differ to any material. After erosive cycle, all materials presented higher E. For DC, GL showed higher DC compared to RCs without bioactive technology (FSF and FBF).
Conclusions: In conclusion, the combination of low-shrinkage monomers and bioactive contents to RCs determines a variety performance of low-viscosity RCs under erosive challenge with acceptable parameters to be clinically employed.