Akademik Veri Yönetim Sistemi
Journal of Advanced Oral Research, cilt.16, sa.2, ss.223-232, 2025 (ESCI, Scopus)
Aim: The purpose of this study was to evaluate the effect of two acidic environments, simulated gastric acid and cola, on the mechanical properties of a computer-aided design and computer-aided manufacturing (CAD/CAM) resin nanoceramic restorative material compared to artificial saliva as the control. Materials and Methods: A total of 30 bar-shaped (15 mm × 4 mm × 1.5 mm) CAD/CAM samples (Lava Ultimate) were prepared and polished. The samples were randomly divided into three groups and immersed in artificial saliva, cola or simulated gastric acid. The modulus of elasticity and flexural strength was then measured by performing a three-point bending test using a universal device for testing. Afterwards, surface hardness values were measured using a microhardness tester. Fractographic analysis was performed by scanning electron microscopy (SEM) on one sample from each group. Data was analysed using the Kruskal–Wallis H test and Spearman correlation analysis. Results: The highest and lowest flexural strength values were obtained from the samples immersed in artificial saliva (215.49 MPa ± 50.15 MPa) and cola (160.14 MPa ± 34.79 MPa) respectively (p < .05). These results correspond to a ~25% decrease in flexural strength when the samples were immersed in cola compared to artificial saliva. The groups did not differ significantly in terms of modulus of elasticity (p > .05). The microhardness values of the samples immersed in artificial saliva were significantly higher than those immersed in the other two acidic environments (p < .05). SEM images showed significant surface irregularities and diffuse pores on the surfaces of the samples subjected to acidic environments. Conclusion: Within the limitations of this in vitro study, exposure to acidic environments may decrease the mechanical properties of CAD/CAM resin nanoceramic materials and contribute to surface degradation. Therefore, clinicians should be cautious when using this type of restorative material for the patients who suffer from gastric reflux and who consume acidic beverages frequently.