Mechanical and Optical Behavior of Two Lithium Silicate-Based Glass Ceramics after Aging in Intra-Oral Simulating Condition

Sherief Mowafy, Postgraduate student, Department of Dental Biomaterial, Mansoura University, Mansoura, EgyptFollow
Salwa Abdel Raouf Elnegoly, Professor, Department of Dental Biomaterial, Mansoura University, Mansoura, Egypt
Hagag Abdelkader Mohammed, Lecturer, Department of Dental Biomaterial, Mansoura University, Mansoura, Egypt

Article Type

Original Article

Section/Category

Oral Biology

Abstract

Aim This study evaluated the mechanical and optical properties of Zirconia-reinforced lithium disilicate (ZLS) and lithium disilicate (LS) glass ceramics after immersion in artificial saliva solutions with varying pH. Methods A total of 104 samples were fabricated from Vita Suprinity (ZLS) and IPS E.max CAD (LS). Samples were divided into test and control groups, with the test group further divided into neutral (7.2), acidic (5.8), and basic (8.3) pH subgroups. Samples were immersed for 24 hours at 37°C and evaluated for microhardness, fracture toughness, and color stability. Results Significant differences were found in the properties of both materials across the different pH mediums. The hardness and fracture toughness of both materials decreased significantly after immersion, with the most pronounced changes occurring in the 5.8 pH medium. Color stability and surface roughness were also significantly affected, with greater color changes and increased roughness observed in acidic environments. Conclusion Acidic environments significantly degrade the mechanical and aesthetic properties of ZLS and LS. Near-neutral and basic pH environments are less detrimental but still cause noticeable changes. Suprinity generally exhibits better resistance to pH-induced degradation than E.max. Maintaining a neutral oral pH is crucial for the longevity of dental restorations. Future research should focus on developing materials with enhanced pH resistance and exploring protective strategies.

Keywords

Lithium Silicate Glass Ceramics; Aging; Mechanical and Optical Behavior; Intra-Oral Simulation; Dental Materials

How to Cite This Article

Mowafy S , Elnegoly S , Mohammed H . Mechanical and Optical Behavior of Two Lithium Silicate-Based Glass Ceramics after Aging in Intra-Oral Simulating Condition. Mans J Dent. 2024; 12(1):
Available at: https://doi.org/10.61793/2812-5479.1148