Evaluation of the Integrity of Ceramic Laminates After Adhesive Cementation

OBJECTIVES: This study evaluated the effects of resin-based materials on crack occurrence in ceramic laminate veneers (CLVs) after adhesive cementation. Additionally, the polymerization shrinkage stress (PSS) and maximum polymerization rate (MPR) of the resin-based materials were determined. MATERIALS AND METHODS: Four resin-based materials were used as luting agents: Variolink Esthetic LC (Ivoclar), SDR Plus (Dentsply), heated Z100 (69°C, Solventum), and heated VisCalor Bulk (65°C, Voco). Twenty-eight prepared premolars received CLVs (n = 7). CLV integrity was assessed by transillumination and scanning electron microscopy. PSS was measured in a universal testing machine and MPR by FTIR spectroscopy (n = 5). Data were analyzed by one-way ANOVA and Tukey's test (α = 0.05). RESULTS: No CLV cracks were detected. VisCalor Bulk showed the lowest PSS (74.2 ± 15.3 MPa) and Variolink Esthetic LC the highest (135.4 ± 8.4 MPa) and the highest MPR (15.5%/s ± 2.3%/s). SDR Plus presented the lowest (10.0%/s ± 1.2%/s). CONCLUSIONS: The type of luting agent did not influence crack formation in CLVs. The PSS and MPR varied among materials.