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. 2021 Sep 28;14(19):5642.
doi: 10.3390/ma14195642.

Effect of the Degree of Conversion on Mechanical Properties and Monomer Elution from Self-, Dual- and Light-Cured Core Composites

Branislava Petronijevic Sarcev  1 , Sebastian Balos  2 , Dubravka Markovic  1 , Ivan Sarcev  1 , Marija Vukcevic  3 , Danka Labus Zlatanovic  2   4 , Vesna Miletic  5
Affiliations

Effect of the Degree of Conversion on Mechanical Properties and Monomer Elution from Self-, Dual- and Light-Cured Core Composites

Branislava Petronijevic Sarcev et al. Materials (Basel). .

Abstract

The objective of this work was to measure and correlate the degree of conversion (DC), mechanical properties and monomer elution from self-, dual- and light-cured core composites. Five samples of each of the following materials were prepared for each test: Clearfil (Core, Photo Core, Automix), Bisco (Core-Flo, Light-Core and Bis-Core). DC was determined using FTIR, compressive and flexural strength and modulus of elasticity using a universal testing machine and microhardness using Vickers hardness. Elution was measured using HPLC. One-way ANOVA with Tukey's post-test and Pearson's correlation were used to statistically analyze the data. DC of Clearfil-Dual (70.1%) and Clerafil-Photo (66.8%) were higher than Clearfil-Self (55.4%) and all Bisco materials (51.4-55.3%). Flexural strength of Clearfilwas higher than that of Bisco composites. The Microhardness of Clearfil-Dual (119.8VHN) and Clearfil-Photo (118.0VHN) were higher compared to other materials. The greatest elution was detected from self-cured materials. DC positively correlated to microhardness and compressive/flexural strength and negatively to BisGMA elution. Clearfil-Photo and Automix showed higher conversion, lower monomer elution and, generally, better mechanical properties. Self-cured composites should not be recommended for routine clinical use as their performance was inferior to dual- and light-cured composites. Microhardness may be used as an indicator of elution.

Keywords: composite core materials; degree of conversion; mechanical properties; monomer elution.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Mean and standard deviation values of the degree of conversion of core composites. The same letters indicate no significant difference between materials (p > 0.05): (a) FTIR spectra and (b) degree of conversion of tested materials.
Figure 2
Figure 2
Mean and standard deviation values of (a) microhardness and (b) compressive strength of core composites. The same letters indicate no significant difference between materials (p > 0.05).
Figure 3
Figure 3
Mean and standard deviation values of (a) flexural strength and (b) modulus of elasticity of core composites. The same letters indicate no significant difference between materials (p > 0.05).
Figure 4
Figure 4
Mean and standard deviation values of monomer elution from core materials. The same upper-case letters indicate no significant differences in TEGDMA elution; the same lower case letters indicate no significant differences in BisGMA elution (p > 0.05).
Figure 5
Figure 5
Correlation between mechanical properties and the degree of conversion of core composites.
Figure 6
Figure 6
Correlation between monomer elution and the degree of conversion and between monomer elution and mechanical properties of core composites.
See this image and copyright information in PMC

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