Effect of layer thickness on the elution of monomers from two high viscosity bulk-fill composites: A high-performance liquid chromatography analysis.

Autor:	Nazar AM; Department of Conservative Dentistry and Endodontics, Annoor Dental College, Ernakulam, Kerala, India., George L; Department of Conservative Dentistry and Endodontics, Annoor Dental College, Ernakulam, Kerala, India., Mathew J; Department of Conservative Dentistry and Endodontics, Annoor Dental College, Ernakulam, Kerala, India.
Jazyk:	angličtina
Zdroj:	Journal of conservative dentistry : JCD [J Conserv Dent] 2020 Sep-Oct; Vol. 23 (5), pp. 497-504. Date of Electronic Publication: 2021 Feb 10.
DOI:	10.4103/JCD.JCD_535_20
Abstrakt:	Aim: The aim is to evaluate the effect of different layer thickness on the amount of elution of monomers from two high viscosity bulk-fill composites after 24 h and 1 month storage in ethanol using high-performance liquid chromatography (HPLC) analysis. Materials and Methods: Forty-eight samples prepared from two high viscosity bulk-fill composite resins; Tetric EvoCeram Bulk Fill and x-tra fil were divided into three groups ( n = 8) based on their layer thickness, i.e., Group 1 (2 mm), Group 2 (4 mm), and Group 3 (6 mm) and were then subdivided based on their storage period. The analysis of the eluates was performed using HPLC unit. Statistical analysis was performed using One-way ANOVA, independent sample t -test, and paired "t" test at a significance level of 0.05 ( P < 0.05). Results: Increase in layer thickness resulted in increased amount of bisphenol A-glycidyl methacrylate (Bis-GMA) and urethane dimethacrylate (UDMA) elution for both composites, i.e., Group 3 > Group 2 > Group 1 and there was statistically significant difference among all the groups. Tetric EvoCeram Bulk Fill showed a statistically significant increase in amount of Bis-GMA and UDMA elution for all groups compared to x-tra fil. Furthermore, increase in storage period resulted in statistically significant increase in amount of Bis-GMA and UDMA elution for both composites, i.e., Group 1B > Group 1A, Group 2B > Group 2A, and Group 3B > Group 3A. The mean value of UDMA elution was higher when compared to that of Bis-GMA elution for both composites and there was statistically significant difference for all groups. Conclusion: Within the limitations of this in vitro study, it was concluded that increase in layer thickness resulted in increased amount of Bis-GMA and UDMA elution for both Tetric EvoCeram Bulk Fill and x-tra fil. Competing Interests: There are no conflicts of interest. (Copyright: © 2021 Journal of Conservative Dentistry.)
Databáze:	MEDLINE
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