Comparative Assessment of Flexural Strength of Monolithic Zirconia With Different Thicknesses and Two Sintering Techniques Publisher Pubmed

Summary: Research shows thicker monolithic zirconia is stronger, but sintering time doesn’t significantly affect strength. #DentalMaterials #Zirconia

Karbasian N¹ ; Fathi A² ; Givehchian P³ ; Nosouhian S³ ; Jamshidian M⁴ ; Almassi F⁴ ; Fazeli A⁴
Source: Clinical and Experimental Dental Research Published:2024

Abstract

Objectives: This study aimed to compare the flexural strength of monolithic zirconia with different thicknesses and two sintering techniques. Materials and Methods: This in vitro, experimental study was conducted on 28 monolithic zirconia discs with 10 mm diameter and 0.5 (n = 14) and 1.2 mm (n = 14) thickness. Each group was divided into two subgroups (n = 7) for fast (60 min) and conventional (120 min) sintering at 1450°C. After sintering, the specimens were thermocycled and their flexural strength was measured by piston-on-3-balls technique in a universal testing machine (0.5 mm/min, 1.2 mm pin diameter). Data were analyzed by the Weibull test, one-way analysis of variance, and Tukey's test (α =.05). Results: The flexural strength of specimens with 1.2 mm thickness was significantly higher than that of specimens with 0.5 mm thickness (p <.05). The flexural strength of 1.2 mm/120-min group was slightly, but not significantly, higher than that of 1.2 mm/60-min group (p >.05). The flexural strength of 0.5 mm/120-min group was slightly, but not significantly, higher than that of 0.5 mm/60-min group (p >.05). Conclusion: The increase in thickness of monolithic zirconia increases its flexural strength; however, increasing the sintering time appears to have no significant effect on the flexural strength of monolithic zirconia. © 2024 The Authors. Clinical and Experimental Dental Research published by John Wiley & Sons Ltd.