Effect of Immediate Dentin Sealing on Bond Strength of Two Ceramic Occlusal Veneers after Thermodynamic Loading

Authors

1 Dentist at Ministry Of Health, Libya

2 Assistant professor of Crown and Bridge, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt

3 Lecturer of Crown and Bridge, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt

Abstract

Purpose: The aim of this study was to evaluate the effect of two types of CAD/CAM ceramic occlusal veneers cemented to the teeth with or without immediate dentin sealing on shear bond strength of posterior occlusal veneers after thermodynamic loading. Materials and Methods: Twenty-four anonymous extracted sound permanent mandibular second molars were prepared to replicate flat occlusal surfaces. Samples were distributed into two groups according to the received occlusal veneer material; lithium disilicate ceramic (IPS-e.max press, Ivoclar Vivadent) and Ultra-translucent zirconia (Katana UTML Kuraray Noritake Dental Inc., Japan). Samples were divided into two equal groups (n=12). Each group was subdivided into two subgroups (n=6) regarding to dentin conditioning method (Immediate dentin sealing IDS vs delayed dentin sealing DDS). The samples were cemented with adhesive resin cement and subjected to thermo-mechanical fatigue, then shear bond strength was measured by the universal testing machine. Results: Statistical analysis showed that the highest statistically significant shear load mean value was recorded for e.max group with IDS subgroup (519.7 N) followed by e.max group with DDS subgroup (510.88 N) then the zirconia group with IDS subgroup (332.625 N) while the lowest statistically significant shear load mean value recorded for zirconia group with DDS subgroup (260.238 N) as proved by one way ANOVA (P= difference between (treated and non-treated) dentin subgroups with e-max group. Conclusion: IDS improves bond strength of occlusal veneers. Furthermore, the bonding technique may have critical effects on the dentin bond strength of occlusal veneers materials. .

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