Abstract

NIVEE SANJANA, Z et al. Comparative evaluation of shear bond strength to dentin with three different aesthetic chemically bonded restorative materials - an In-vitro study. S. Afr. dent. j. [online]. 2024, vol.79, n.1, pp.17-20. ISSN 0375-1562.  http://dx.doi.org/10.17159/sadj.v79i01.18158.

INTRODUCTION: The use of glass ionomer cements (GIC) as a restorative material was limited to areas of low masticatory forces due to their low mechanical properties which were also affected by the powder/liquid mixing ratio of this material. Bond strength is important for the clinical success of adhesive material. The shear bond strength (SBS) is the maximum force that an adhesive joint can tolerate before fracture which is tested by SBS tests. The high bond strength helps the adhesive to resist stresses caused by resin contraction and forces for a longer time and thus prevents the problems of bond failure such as recurrent caries, tooth sensitivity and restoration failure. GIC as a restorative material has the capacity to release fluoride and shows good bonding ability. The use of GIC in anterior applications appears to be satisfactory, but they have limitations for use in permanent posterior teeth, particularly with regard to large restorations. Zirconia-reinforced GI (Zirconomer, Shofu Inc, Japan) is a new class of restorative material containing reinforced glass ionomer with special zirconia fillers that promises the strength and durability of amalgam with the protective benefits of glass ionomer while eliminating the hazards of mercury. Amalgomer CR (Advanced Health Care, Tonbridge, Kent, UK), a novel ceramic-reinforced GIC, was introduced, which combines the benefits of GIC with the high strength of ceramics. In the present study, shear bond strength to the dentin with Zirconomer, Amalgomer CR and Fuji type IX GIC (GC Tokyo) are compared. AIM: To evaluate the shear bond strength of three different aesthetic materials to dentin. METHODOLOGY: Thirty extracted human molar teeth were taken, cleaned, stored and the occlusal surfaces of the teeth were flattened with a straight fissured bur at a depth of three millimetres until dentin was exposed. Acrylic blocks were prepared by cold cure acrylic resin and the samples were embedded into the blocks and conditioning of dentin was done using dentin conditioner (GC Corporation Tokyo, Japan). Out of 30 dentin-exposed samples, 10 samples were restored with Zirconomer, the other 10 with Amalgomer CR and the remaining 10 with GIC respectively. All the specimens were transferred to the universal testing machine individually and subjected to shear bond strength analysis. RESULT: Statistical analysis was done for all three groups by using descriptive statistics that include one-way ANOVA and Tukey's multiple post hoc procedures for intergroup comparison. CONCLUSION: Zirconomer showed better shear bond strength than Amalgomer CR and GIC

Keywords : Zirconomer; Amalgomer CR; glass ionomer cement; shear bond strength.

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