TY - JOUR
T1 - Effect of polymerization time and home bleaching agent on the microhardness and surface roughness of bulk-fill composites
T2 - A scanning electron microscopy study
AU - Özduman, Zümrüt Ceren
AU - Kazak, Magrur
AU - Fildisi, Mehmet Ali
AU - Özlen, Rümeysa Hatice
AU - Dalkilic, Evrim
AU - Donmez, Nazmiye
N1 - Publisher Copyright:
© 2019 Zümrüt Ceren Özduman et al.
PY - 2019
Y1 - 2019
N2 - 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 (4mm depth and 5mm 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-Whitney U tests. 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.
AB - 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 (4mm depth and 5mm 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-Whitney U tests. 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.
UR - http://www.scopus.com/inward/record.url?scp=85069289556&partnerID=8YFLogxK
U2 - 10.1155/2019/2307305
DO - 10.1155/2019/2307305
M3 - Article
C2 - 31281561
AN - SCOPUS:85069289556
SN - 0161-0457
VL - 2019
JO - Scanning
JF - Scanning
M1 - 2307305
ER -