Comparative evaluation of fracture resistance of posterior teeth restored with recent composite resins
An in vitro study
Keywords:
fracture resistance, nanohybrid composite, micro hybrid composite, nanofilled compositeAbstract
Aim: Comparative evaluation of the fracture resistance of maxillary molar teeth restored with recent composite resins. Materials and Methods: Fifty freshly extracted molar teeth were selected. Ten specimens served as control –unrestored, unprepared, intact (Group 1). Mesio-occluso-distal cavity preparation was prepared on the rest of the specimens. These specimens were further divided into four groups: prepared but unrestored (Group 2), teeth restored with with Nano hybrid composite (Tetric N-Ceram, Ivoclar Vivadent). (Group 3), teeth restored with Micro hybrid composite (Polofil supra). (Group 4), and teeth restored with Nano filled composite (Filtek Z-350). (Group 5). The specimens were then subjected to compressive axial load using universal testing machine. Data were analyzed using data were analyzed using Statistical package for social sciences software (SPSS v 20.0, IBM Corp.) Results: The positive control group exhibited highest fracture load (377±63.8 Kg-force). There was less difference seen in between the all recent composite resins (P > 0.05). There is significant difference noted in fracture load between control group and treatment groups Conclusion: Type of the composite restoration makes little difference in the fracture toughness while restoring MOD cavities.
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