A COMPARISON OF PUSHOUT BOND STRENGTH OF FIBRE POST LUTED WITH FOUR DIFFERENT RESIN CEMENTS
AN IN VITRO STUDY
Abstract
Aim: To compare the push out bond strength of a fibre post in single rooted tooth at coronal and middle third using four different resin based luting cements.
Materials & Methods: In this in-vitro study 80 mandibular premolars were decoronated 2mm above the CEJ, and roots were treated endodontically. The samples were then sectioned using safe-sided diamond disc in coronal and middle regions of root (1mm thickness). On the basis of two regions (coronal and middle), samples were divided in two subgroups. Fibre-reinforced composite posts were cemented with four resin cement systems: (a) RMGIC, (b) Paracore, (c) SoloCem, and (d) Maxcem Elite. The push-out test was performed with a universal testing machine at a crosshead speed of 1 mm/min, and bond strength values were evaluated. The data was statistically analyzed using ANOVA one way test for comparing mean resistance values and post hoc test for multiple comparisons using SPSS 23.0.
Results: Multiple comparisons revealed that difference between all 4 groups is significant with P value <0.05 suggesting that Paracore dual cured resin based luting cement has highest bond strength at coronal as well as at middle region of post cemented root sections as compared to other three dual cured resin based luting cements RMGIC, SoloCem and Maxcem Elite.
Conclusion: Fibre post luted with dual-polymerized glass-reinforced composite resin cement- Paracore has highest bond strength in coronal as well as in middle sections as compared to other 3 cements (RMGIC, SoloCem, Maxcem Elite). RMGIC & Maxcem Elite resin cements shows approximately equal values, which can be considered to have similar bond strength in middle as well as in coronal sections.
Clinical Significance:
Push out bond strength test by application of single compressive load it simulates the dynamics of delivery and distribution of force in clinical situation. Significance of this result, when applied to clinical situations, lies in the fact that selection of luting cement affects the adhesion of post within the canal.
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