2
Fixed prosthodontics department, Faculty of Dentistry, Cairo University, Egypt
3
Cairo university
10.21608/acdj.2025.396282.1038
Abstract
Abstract Introduction:The success of ceramic restorations relies heavily on the bond strength between ceramic and resin composites. Hydrofluoric acid(HF)etching is a critical step in surface treatment, yet its optimal duration for advanced lithium disilicate ceramics like CEREC Tessera remains unclear. Objectives:This is vitro study aimed to assess how different HF etching times (20, 30, and 60 s) affect the shear bond strength between CEREC Tessera and resin composite substrates. it aims to evaluate the influence of etching time on failure modes. Methodology: Twenty-four ceramic blocks (1.5 × 11 × 14 mm) were fabricated using CAD/CAM technology and randomly divided into three groups (n=8) based on HF etching duration: Group A (30 s), Group B (20 s), and Group C (60 s). All specimens were subjected to 5% HF etching, silane application,and bonding with dual-cure resin cement under a standardized load. After thermocycling (5,000 cycles),shear bond strength was tested using a universal testing machine. Failure modes were analyzed microscopically.Statistical analysis included one-way ANOVA, Chi-square tests,and normality assessments. Results:Mean shear bond strengths were4.84 MPa(Group A), 4.91MPa (Group B),and5.32 MPa (Group C).No significant differences were found among groups p=0.90. Failure mode analysis revealed predominantly cohesive failures(>80%), with no statistically significant variation across groups p=0.39. Conclusions:Within the limitations of this in vitro study, HF etching times ranging from 20 to 60 s did not significantly alter shear bond strength or failure patterns. The high incidence of cohesive failures indicates strong internal ceramic integrity and effective bonding Keywords:CAD/CAM ceramics,CEREC Tessera,hydrofluoric acid etching,lithium disilicate,shear bond strength,thermocycling
kamal, N., Mohamed Farghaly, A., & Awadallah, K. (2025). EFFECT OF ACID ETCHING DURATIONS ON SHEAR BOND STRENGTH OF ADVANCED LITHIUM DISILICATE CERAMICS (An in-vitro study). Ahram Canadian Dental Journal, 4(3), 158-177. doi: 10.21608/acdj.2025.396282.1038
MLA
nehal Mohammed kamal; Ahmed Farghaly Mohamed Farghaly; Karim Ahmed Awadallah. "EFFECT OF ACID ETCHING DURATIONS ON SHEAR BOND STRENGTH OF ADVANCED LITHIUM DISILICATE CERAMICS (An in-vitro study)", Ahram Canadian Dental Journal, 4, 3, 2025, 158-177. doi: 10.21608/acdj.2025.396282.1038
HARVARD
kamal, N., Mohamed Farghaly, A., Awadallah, K. (2025). 'EFFECT OF ACID ETCHING DURATIONS ON SHEAR BOND STRENGTH OF ADVANCED LITHIUM DISILICATE CERAMICS (An in-vitro study)', Ahram Canadian Dental Journal, 4(3), pp. 158-177. doi: 10.21608/acdj.2025.396282.1038
VANCOUVER
kamal, N., Mohamed Farghaly, A., Awadallah, K. EFFECT OF ACID ETCHING DURATIONS ON SHEAR BOND STRENGTH OF ADVANCED LITHIUM DISILICATE CERAMICS (An in-vitro study). Ahram Canadian Dental Journal, 2025; 4(3): 158-177. doi: 10.21608/acdj.2025.396282.1038
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