elsoudany, M., Hammad, I., Abdel Raheem, I. (2025). EVALUATION OF SHEAR BOND OF TWO PRESSABLE GLASS CERAMICS TO THEIR VENEERING MATERIALS (IN VITRO STUDY). Alexandria Dental Journal, 50(1), 139-144. doi: 10.21608/adjalexu.2024.246600.1433
momen gamal elsoudany; Ihab Adel Hammad; Islam Abdel Raheem. "EVALUATION OF SHEAR BOND OF TWO PRESSABLE GLASS CERAMICS TO THEIR VENEERING MATERIALS (IN VITRO STUDY)". Alexandria Dental Journal, 50, 1, 2025, 139-144. doi: 10.21608/adjalexu.2024.246600.1433
elsoudany, M., Hammad, I., Abdel Raheem, I. (2025). 'EVALUATION OF SHEAR BOND OF TWO PRESSABLE GLASS CERAMICS TO THEIR VENEERING MATERIALS (IN VITRO STUDY)', Alexandria Dental Journal, 50(1), pp. 139-144. doi: 10.21608/adjalexu.2024.246600.1433
elsoudany, M., Hammad, I., Abdel Raheem, I. EVALUATION OF SHEAR BOND OF TWO PRESSABLE GLASS CERAMICS TO THEIR VENEERING MATERIALS (IN VITRO STUDY). Alexandria Dental Journal, 2025; 50(1): 139-144. doi: 10.21608/adjalexu.2024.246600.1433
EVALUATION OF SHEAR BOND OF TWO PRESSABLE GLASS CERAMICS TO THEIR VENEERING MATERIALS (IN VITRO STUDY)
2Conservative Department, Faculty of Dentistry, Alexandria university,Egypt
3Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
Abstract
Introduction: The bond between the veneering ceramic and the substructure is important for the long-term survival of the restorations. However, the shear bond strength of heat-pressed ceramic substructures to veneering ceramic materials remains unclear. Aim of study: This study aimed to evaluate the SBS and mode of failure of two heat-pressed glass ceramic substructures (lithium disilicate and zirconia-reinforced lithium silicate) with their corresponding veneering ceramics. Material and methods. Thirty glass ceramic disk-shaped specimens fabricated from heat-pressed LDS and ZLS (n = 15) with a diameter of 10mm and a thickness of 3mm. LDS and ZLS specimens were veneered with FLGC and LFP veneering materials, respectively. The veneering material was condensed in a mold and fired on the glass ceramic to form a disk with a diameter of 3mm and a thickness of 2mm. Specimens were subjected to shear force in a universal testing machine at a crosshead speed of 0.5 mm/minute until failure. Failed specimens were examined under an scanning electron microscope to analyze the mode of failure. Data analyzed using independent t-test. Results. LDS (29.75 MPa) showed a statistically significant higher Shear bond strength than that ZLS (21.96 MPa) (P value
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