30. A Comparison of Degree of Conversion, Microhardness and Surface Characterization of Two Commercially Available Composite Materials: An in Vitro Study
Amna Mehwish Ikram1, Faisal Moeen1, Muhammad Talal Khan1
Muhammad Humza Bin Saeed2
Objective: To compare the micro-hardness, degree of conversion and elemental composition of two resin based composites available in the market.
Study Design: Comparative study.
Place and Duration of Study: This study was conducted at the Department of Dental Materials, Islamic International Dental College, Islamabad for 06 months from January 2018 to June 2018.
Materials and Methods: 40 disc shaped specimens of two light cured composite filling materials FiltekTMZ250 XT and FiltekTMZ250 were irradiated for 20s and 40s. The degree of conversion, micro-hardness, surface characterization and compositional elemental analysis wererecorded and compared.
Results: The degree of conversion (DC) of FiltekTMZ250-XT was found to be greater thanFiltekTMZ250 composite material yielding a higher mean degree of conversion at 20s and 40s (p < 0.05).It was also found that the ultrastructure and size of filler particles of the two composites varied significantly from each other resulting in a statistically significant difference in Vickers hardness micro-hardness (MH) (p < 0.05).
Conclusion: The DC and MH of the FiltekTMZ250 composite was found to be lower than the FiltekTMZ250 XT composite. Additionally, with variations in values compared to those acquired from literature it appears that the Z250 composite acquired is a counterfeit. It is recommended that clinicians should purchase original products from authorized dealers and should remain aware of other commercially available counterfeit dental products.
Key Words: Degree of conversion, micro-hardness, scanning electron microscopy, energy dispersive X-ray analyzer, composite resin, FTIR, Vickers hardness
Citation of articles: Ikram AM, Moeen F, Khan MT, Saeed MHB. A Comparison of Degree of Conversion, Microhardness and Surface Characterization of Two Commercially Available Composite Materials: An in Vitro Study. Med Forum 2019;30(8):132-137.