Effect of Polymerization Time and Home Bleaching Agent on the Microhardness and Surface Roughness of Bulk-Fill Composites: A Scanning Electron Microscopy Study
Autor: | Magrur Kazak, Zümrüt Ceren Özduman, Rumeysa Hatice Enginler Ozlen, Mehmet Ali Fildisi, Nazmiye Dönmez, Evrim Eliguzeloglu Dalkilic |
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Přispěvatelé: | ÖZLEN, RÜMEYSA HATİCE |
Rok vydání: | 2018 |
Předmět: |
Materials science
Time Factors Article Subject Light Surface Properties 0206 medical engineering Bulk fill 02 engineering and technology Surface finish Indentation hardness Composite Resins Polymerization 03 medical and health sciences Bleaching Agents 0302 clinical medicine Hardness Microscopy Materials Testing Surface roughness Humans Composite material lcsh:Microscopy Instrumentation Scanning electron microscopy study Home bleaching lcsh:QH201-278.5 030206 dentistry 020601 biomedical engineering Atomic and Molecular Physics and Optics A scanning electron microscopy study- Scanning cilt.2019 2019 [ÖZDUMAN Z. C. Kazak M. FİLDİŞİ M. A. ÖZLEN R. H. DALKILIÇ E. DÖNMEZ N. -Effect of polymerization time and home bleaching agent on the microhardness and surface roughness of bulk-fill composites] Multivariate Analysis Microscopy Electron Scanning Research Article |
Zdroj: | Scanning Scanning, Vol 2019 (2019) |
ISSN: | 1932-8745 |
Popis: | Objective. The aim of this study is to evaluate the microhardness and surface roughness of two different bulk-fill composites polymerized with light-curing unit (LCU) with different polymerization times before and after the application of a home bleaching agent.Materials-Methods. For both microhardness and surface roughness tests, 6 groups were prepared with bulk-fill materials (SonicFill, Filtek Bulk Fill) according to different polymerization times (10, 20, and 30 s). 102 specimens were prepared using Teflon molds (4 mm depth and 5 mm diameter) and polymerized with LCU. 30 specimens (n=5) were assessed for microhardness. Before home bleaching agent application, the bottom/top (B/T) microhardness ratio was evaluated. After bleaching agent application, the microhardness measurements were performed on top surfaces. Roughness measurements were performed in 72 specimens (n=12) before and after bleaching application. Additionally, for SEM analyses, two specimens from all tested groups were prepared before and after bleaching agent application. The data B/T microhardness ratio before bleaching was analyzed by two-way ANOVA and Tukey’s HSD test. The data from the top surface of specimens’ microhardness before and after bleaching were analyzed using Wilcoxon signed-rank test, Kruskal-Wallis, Mann-WhitneyUtests. The data from surface roughness tests were statistically analyzed by multivariate analysis of variance and Bonferroni test (p<0.05).Results. The B/T microhardness ratio results revealed no significant differences between groups (p>0.05). Comparing the microhardness values of the composites’ top surfaces before and after bleaching, a significant decrease was observed exclusively in FB30s (p<0.05). No significant differences in surface roughness values were observed when the groups were compared based on bulk-fill materials (p>0.05) while the polymerization time affected the surface roughness of the SF20s and SF30s groups (p<0.05). After bleaching, surface roughness values were significantly increased in the SF20s and SF30s groups (p<0.05).Conclusion. The clinicians should adhere to the polymerization time recommended by the manufacturer to ensure the durability of the composite material in the oral environment. |
Databáze: | OpenAIRE |
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