Investigation of microhardness, surface roughness, and color change of preheated composite resins
Abstract
Aim: Applying heat is a method currently used to enhance the depth of polymerization in composite resin. This study aimed to evaluate the effects of heat treatment on resin hardness, color change, and surface roughness.
Methodology: In this study, 64 samples (8 mm2 × 2 mm2) were produced (3M Filtek Universal, G-aenial A’CHORD, Neo Spectra and Clearfil Majesty ES-2) using a Teflon mold (n = 8). Half of the samples were preheated to 50oC, while the other half were polymerized at room temperature. Initial color measurements were performed using a spectrophotometer, the surface roughness was assessed with a profilometer, and the microhardness was determined using a Vickers microhardness device. Subsequently, all samples were immersed in a coffee solution at 37oC. The color changes were documented by the seventh day. The changes in color, roughness, and hardness of the materials were examined by the thirtieth day.
Results: The groups that received heat treatment exhibited higher hardness values. The unheated G-aenial A’CHORD composite resin demonstrated the most significant color change by the end of the thirtieth day, while heated and unheated Clearfil Majesty ES-2 composite samples exhibited the least color change. By the end of the thirtieth day, the surface roughness of all samples increased significantly from the baseline, with the 3M Filtek Universal samples, both heated and unheated, showing the highest surface roughness.
Conclusion: According to the results of this study, heat treatment of composite resins before polymerization reduces discoloration and improves hardness. Therefore, it is recommended to heat composite resins before application.
How to cite this article:
Çekmez MB, Karaoğlanoğlu S, Aybala Oktay E, Aydın N, Ersöz B. Investigation of microhardness, surface roughness, and color change of preheated composite resins. Int Dent Res 2024;14(1):42-49. https://doi.org/10.5577/intdentres.523
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This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.