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. 2021 Sep 13;13(18):3088.
doi: 10.3390/polym13183088.

Polymerization Shrinkage of Short Fiber Reinforced Dental Composite Using a Confocal Laser Analysis

Daisuke Miura  1 , Yoshiki Ishida  1 , Akikazu Shinya  1   2
Affiliations

Polymerization Shrinkage of Short Fiber Reinforced Dental Composite Using a Confocal Laser Analysis

Daisuke Miura et al. Polymers (Basel). .

Abstract

The purpose of this study was to investigate the polymerization shrinkage of short fiber reinforced composite (SFRC) using a multicolor confocal displacement laser that can measure the polymerization shrinkage with high accuracy. The three types of SFRCs used in this study were XD (Ever X Flow Dentin), XB (Ever X Flow Bulk), and XP (EverX Posterior). In addition, CF (Clearfil majesty ES Flow) with hybrid type filler was used as a control. The measured values of the final polymerization shrinkage rate and amount of polymerization shrinkage rate when the polymerization shrinkage rate became constant (less than 0.1 µm/s) were approximated for all SFRCs. XP had a large aspect ratio of glass fiber filler and showed a significant difference from XD with a small aspect ratio (p < 0.05). There was no significant difference in the measured value of time when the polymerization contraction reached a constant speed (0.1 µm/s or less) for all SFRCs (p > 0.05). There was no significant difference in the measured values of polymerization shrinkage rate after the polymerization shrinkage reached a constant rate for all SFRCs (p > 0.05). These results show that glass fiber with large aspect ratio can alleviate polymerization shrinkage stress. The polymerization behavior of SFRC was found to be dependent on the amount of glass fiber filler, aspect ratio, and orientation.

Keywords: aspect ratio of glass fiber; biomimetics restoration; bulk fill dental composite resin; contraction gap; dental composite resin; dental materials; fiber reinforced composite; multicolor confocal displacement laser; polymerization shrinkage stress; short fiber reinforced dental composite resin.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Multicolor confocal displacement laser used in this study for measuring the shrinkage of short fiber reinforced composites. (a): a center head CL-L007G, Keyence, Osaka, Japan, (b): optical unit CL-L015, Keyence, Osaka, Japan.
Figure 2
Figure 2
Final polymerization shrinkage rate of short fiber reinforced composites. (Significant difference between the same letters: p < 0.05, I: 95% confidence interval).
Figure 3
Figure 3
Polymerization shrinkage rate amount when the polymerization shrinkage speed becomes constant of short fiber reinforced composites (0.1 µm/s or less) (PSC). (Significant difference between the same letters: p < 0.05, I: 95% confidence interval).
Figure 4
Figure 4
Time when the polymerization contraction reached a constant speed of short fiber reinforced composites (0.1 µm/s or less) (TPS) (I: 95% confidence interval).
Figure 5
Figure 5
Amount of polymerization shrinkage rate after polymerization shrinkage reaches a constant speed of short fiber reinforced composites (0.1 µm/s or less) (PSA) (I: 95% confidence interval).
Figure 6
Figure 6
Curves of the polymerization shrinkage on short fiber reinforced composites.
See this image and copyright information in PMC

References

    1. Abouelleil H., Pradelle N., Villat C., Attik N., Colon P., Grosgogeat B. Comparison of mechanical properties of a new fiber reinforced composite and bulk filling composites. Restor. Dent. Endod. 2015;40:262–270. doi: 10.5395/rde.2015.40.4.262. - DOI - PMC - PubMed
    1. Miura D., Miyasaka T., Aoki H., Aoyagi Y., Ishida Y. Correlations among bending test methods for dental hard resins. Dent. Mater. J. 2017;36:491–496. doi: 10.4012/dmj.2016-304. - DOI - PubMed
    1. Pallesen U., van Dijken J.W. A randomized controlled 27 years follow up of three resin composites in Class II restorations. J. Dent. 2015;43:1547–1558. doi: 10.1016/j.jdent.2015.09.003. - DOI - PubMed
    1. Pallesen U., van Dijken J.W. A randomized controlled 30 years follow up of three conventional resin composites in Class II restorations. Dent. Mater. 2015;31:1232–1244. doi: 10.1016/j.dental.2015.08.146. - DOI - PubMed
    1. Darabi F., Seyed-Monir A., Mihandoust S., Maleki D. The effect of preheating of composite resin on its color stability after immersion in tea and coffee solutions: An in-vitro study. J. Clin. Exp. Dent. 2019;11:e1151–e1156. doi: 10.4317/jced.56438. - DOI - PMC - PubMed

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