Abstract
Aims This in vitro study aimed to evaluate the effect of the degrees of translucency in different types of monolithic zirconia as well as the aging and surface treatment with airborne particle abrasion on the flexural strength of monolithic zirconia. Materials and Methods Sixty bar-shaped specimens were fabricated from three different types of presintered monolithic zirconia (n = 20 per group) including low translucent (LT) (DD Bio ZW iso, high strength zirconia, Dental Direkt, Germany), high translucent (HT) (DD Bio ZX2 98, high translucent zirconia, Dental Direkt, Germany), and multilayered system (ML) (DD cubeX2®ML, multilayer, cubic zirconia system, Dental Direkt, Germany). Each monolithic zirconia group was equally subdivided according to be either air-abraded with 110 µm aluminium oxide particles or left untreated (control). After thermocycling, the flexural strength was measured by using a universal testing machine. Two-way ANOVA followed by Tukey's post hoc and independent samples t-test were used for the statistical analyses (P < 0.05). Results Surface treatment and types of zirconia were found to have a significant interaction (P = 0.010). Having controlled the effect of surface treatment, the flexural strength of HT and LT zirconia was found to be significantly higher than the ML zirconia system (P ≤ 0.001). Airborne particle abrasion could significantly decrease the flexural strength of monolithic zirconia only in ML zirconia (P = 0.002). Conclusions Multilayered zirconia system had the lowest flexural strength among all groups. Moreover, the flexural strength of this system was attenuated by surface treatment with airborne particles abrasion.
Highlights
Bilayered core-ceramic systems were designed to cover the opaque face of zirconia under a tooth-like appearance while having the strength of yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP)
Monolithic zirconia has the advantages of less teeth preparation and fabrication time, International Journal of Dentistry material thickness, high strength, and toughness in solidsintered zirconia, as well as eliminating the complications of porcelain veneer sintering. ese prostheses are made with computer-aided design (CAD) and computer-aided manufacturing (CAM) technology [7, 8]
Not enough studies have addressed the effect of different translucencies and types of monolithic zirconia especially multilayered system and the combined effect of translucency and surface treatment on the flexural strength of monolithic zirconia. is in vitro study was designed to evaluate the effect of three different translucencies and air abrasion with aluminum oxide (Al2O3) on the flexural strength of aged monolithic zirconia. e null hypothesis was that different translucencies and surface treatment would not affect the flexural strength of thermocycled monolithic zirconia
Summary
Is in vitro study aimed to evaluate the effect of the degrees of translucency in different types of monolithic zirconia as well as the aging and surface treatment with airborne particle abrasion on the flexural strength of monolithic zirconia. Its strength is affected by different stresses such as sintering temperatures, occlusal adjustment, mechanical forces, and surface treatments like grinding or airborne particle abrasion (APA) [2, 3]. Is in vitro study was designed to evaluate the effect of three different translucencies and air abrasion with aluminum oxide (Al2O3) on the flexural strength of aged monolithic zirconia. E null hypothesis was that different translucencies and surface treatment would not affect the flexural strength of thermocycled monolithic zirconia
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