Effect of surface treatments on push out strength of fiber posts to composite resin core materials
Introduction: Influence of different surface treatments of fiber posts on the bond strength of dual cure resin cement
Objective: To evaluate the influence of different surface treatments on the push out bond strength between fiber posts and dual cure composite resins.
Methodology: Glass fiber posts were divided into 4 groups based on different surface treatments i.e Group I - control, Group II - methyl methacrylate monomer, Group III - 30% hydrogen peroxide (H2O2), Group IV- methylene chloride (CH2Cl2). Group-III and IV post samples were subjected to treatment for a period of 5 mins and group-II post samples were subjected to treatment until the monomer completely evaporates. After treatment all the specimens were rinsed. The posts were secured perpendicularly on a glass slab. Cylindrical plastic matrix was placed around the post and core build up was done incrementally using a light curing unit. The post-composite assembly was then sectioned into 1 mm thick discs and push-out bond strength was recorded using universal testing machine.
Result: Bond strength after treatment with 30% Hydrogen peroxide was maximum (32.98 MPa). The bond strength of the control group (no treatment) was least (6.20 MPa).
Conclusion: Surface treatment of glass fiber posts with CH2Cl2, 30% H2O2 for 5 min or methyl methacrylate enhances the adhesion between fiber posts and resin core materials. 30% H2O2 provides greater bond strength when compared to CH2Cl2 and methyl methacrylate.
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