EVALUATION OF SHEAR BOND OF TWO PRESSABLE GLASS CERAMICS TO THEIR VENEERING MATERIALS (IN VITRO STUDY) | ||
| Alexandria Dental Journal | ||
| Article 24, Volume 50, Issue 1, April 2025, Pages 139-144 PDF (188.02 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/adjalexu.2024.246600.1433 | ||
| Authors | ||
| momen gamal elsoudany* 1; Ihab Adel Hammad2; Islam Abdel Raheem3 | ||
| 1fixed prosthodontics, ALexandria university, Alexandria, Egypt. | ||
| 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 | ||
| Keywords | ||
| shear bond strength; bilayered ceramics; heat-pressed ceramics | ||
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