Shear Bond Strength of Aged CAD/CAM Ceramic Materials Repaired by Resin Composite In vitro Using Different Repair Adhesives
Aim of the study: The aim of this study was to evaluate the shear bond strength of three different CAD/CAM ceramic blocks repaired with Nano-hybrid composite resin using three different repair adhesives, and to Compare and determine which bonding systems achieve superior bond strength with each type of ceramic materials tested.
Materials and methods: A total of 72 specimens (10 × 10 × 2 mm) of ceramic mini-blocks will be prepared and divided into three groups (n=24) according to the type of ceramic materials as: Group A: A resin Nano ceramic (VITA Enamic EM-14 2m2HT).
Group B: A feldspar ceramic (Cerec block CPC-14 A2C; Sirona Dental, Germany).
Group C: A lithium disilicate reinforced ceramic (IPS e.max HTA2 CAD; IVOCLAR), then each type was subjected to surface roughness using silicon carbide paper with a grit size of 120 p. Thermo-cycled (500 cycles, 5 °C to 55 °C). Each group was divided into three subgroups treated with three types of repair adhesives as: (1) Ceramic repair kit by Ivoclar vivadent. (2) Scotch bond universal adhesive by 3M ESPE (3) Application of tokuyama universal self-cure bond. All blocks will be repaired using the Nano-hybrid resin composite (Tetric Evo Ceram/A2). The ceramic-composite blocks will then subject to shear bond strength testing machine and the failure mode will be determine with stereomicroscopes. The data were analyzed using Two-way ANOVA and Bonferroni post hoc test (multiple Pairwise comparisons).
Results: The result of this study revealed that for the vita Enamic groups, Ivoclar repair system showed higher bond strength values with a significant difference with Palfique universal bond. In Cerec CPC and IPS e.max CAD, Palfique universal bond showed the highest mean bond strength values than the other repair adhesives.
Conclusion: Palfique universal bond achieved a high bond strength values with each type of ceramic material tested in this study. Type of ceramic materials produces the greatest influence on the bonding strength with a specific type of repair adhesive. Ivoclar ceramic repair system kit worked better with Vita Enamic ceramic. Scotch bond universal adhesive produced best results with IPS e.max CAD. Palfique universal bond bonds with the three types of ceramics equally.