Original Research Article
Year: 2020 | Month: November | Volume: 10 | Issue: 11 | Pages: 112-122
A Study to Evaluate and Compare the Shear Bond Strength of Different Core Materials – An in Vitro Study
Srinu G1, Malathi Dayalan2,Ravi Kumar Nagabhairava3, Rinu Thomas4, Syeda Rahath Fatima5
1Senior Lecturer, Department of Prosthodontics, The Oxford Dental College, Bangalore-560068
2Professor, Department of Prosthodontics, The Oxford Dental College, Bangalore-560068
3Professor, Department of Prosthodontics, The Oxford Dental College, Bangalore-560068
4Prosthodontist, Kerala-691551
5Post Graduate Student, Department of Prosthodontics, The Oxford Dental College, Bangalore-560068
Corresponding Author: Syeda Rahath Fatima
ABSTRACT
Purpose: To evaluate and compare the shear bond strength of different core materials.
Materials and method: Eighty extracted non-carious permanent first molar teeth were randomly selected and embedded in an auto polymerizing pink acrylic resin. Specimens were selected on the basis of certain inclusion and exclusion criteria. Four commercially available brands of core materials were selected, (Bulk fill (IVOCLAR), Core X flow (DENTSPLY), Valux plus (3M ESPE) and Resin Modified Glass ionomer cement (GC)). The shear bond strength was tested using an Universal Testing Machine, (Mecmesin UK) using load cell of 500 N. The dimensions of the specimens were entered into the program for computation. The fracture sites along the dentin core materials interface was evaluated by Scanning electron microscope (Ultra 55, field emission scanning electron microscope, Karl Zeiss) to determine whether the fracture was adhesive or cohesive in nature.
Results: Higher mean shear bond strength was recorded for CORE X FLOW (GROUP II) group followed by BULK FILL (GROUP I) and VALUX PLUS (GROUP III) respectively. Lowest shear strength was recorded for RESIN MODIFIED GIC (GROUP IV).
Conclusion: Resin modified glass ionomer cement can be used as a core build up material in situations where the tooth structure lost is minimal, as it the least shear bond strength and its use may be limited to anterior esthetic zone.
Materials and method: Eighty extracted non-carious permanent first molar teeth were randomly selected and embedded in an auto polymerizing pink acrylic resin. Specimens were selected on the basis of certain inclusion and exclusion criteria. Four commercially available brands of core materials were selected, (Bulk fill (IVOCLAR), Core X flow (DENTSPLY), Valux plus (3M ESPE) and Resin Modified Glass ionomer cement (GC)). The shear bond strength was tested using an Universal Testing Machine, (Mecmesin UK) using load cell of 500 N. The dimensions of the specimens were entered into the program for computation. The fracture sites along the dentin core materials interface was evaluated by Scanning electron microscope (Ultra 55, field emission scanning electron microscope, Karl Zeiss) to determine whether the fracture was adhesive or cohesive in nature.
Results: Higher mean shear bond strength was recorded for CORE X FLOW (GROUP II) group followed by BULK FILL (GROUP I) and VALUX PLUS (GROUP III) respectively. Lowest shear strength was recorded for RESIN MODIFIED GIC (GROUP IV).
Conclusion: Resin modified glass ionomer cement can be used as a core build up material in situations where the tooth structure lost is minimal, as it the least shear bond strength and its use may be limited to anterior esthetic zone.
Key words: Core build up, resin modified glass ionomer cement, composite resin core materials, shear bond strength, fracture site.