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. 2016 Sep-Oct;32(5):1199-1203.
doi: 10.12669/pjms.325.10727.

Compressive strength and the effect of duration after photo-activation among dual-cure bulk fill composite core materials

Fahad Alkhudhairy  1 , Fahim Vohra  2
Affiliations

Compressive strength and the effect of duration after photo-activation among dual-cure bulk fill composite core materials

Fahad Alkhudhairy et al. Pak J Med Sci. 2016 Sep-Oct.

Abstract

Objectives: To assess compressive strength and effect of duration after photoactivation on the compressive strength of different dual cure bulk fill composites.

Methods: Seventy-two disc shaped (4x10mm) specimens were prepared from three dual cure bulk fill materials, ZirconCore (ZC) (n=24), MulticCore Flow (MC) (n=24) and Luxacore Dual (LC) (n=24). Half of the specimens in each material were tested for failure loads after one hour [MC1 (n=12), LC1 (n=12) & ZC1 (n=12)] and the other half in 7 days [MC7 (n=12), LC7 (n=12), ZC7 (n=12)] from photo-polymerization using the universal testing machine at a cross-head speed of 0.5 cm/minutes. Compressive strength was calculated using the formula UCS=4f/πd2. Compressive strengths among different groups were compared using analysis of variance (ANOVA) and Tukey's multiple comparisons test.

Results: Maximum and minimum compressive strengths were observed in ZC7 (344.14±19.22) and LC1 (202.80±15.52) groups. Specimens in LC1 [202.80 (15.52)] showed significantly lower compressive strength as compared to MC1 [287.06 (15.03)] (p<0.01) and ZC1 [276.82 (11.51)] (p<0.01). ZC7 [344.14 (19.22)] specimens showed significantly higher (p<0.01) compressive strengths compared to LC7 [324.56 (19.47)] and MC7 [315.26 (12.36)]. Compressive strengths among all three materials were significantly higher (p<0.01) at 7 days as compared to one hour.

Conclusions: Bulk fill material with Zr nano-hybrid filler (ZC) showed high compressive strength compared to MC and LC. Increasing the post photo-activation duration (from one hour to 7 days) significantly improves the compressive strengths of dual cure bulk fill material.

Keywords: Bulk fill; Compressive strength; Dual cure; Photoactivation duration; Zirconia nano particle.

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Conflict of interest statement

Declaration of interest: The authors declare no conflict of interest.

References

    1. Malhotra N, Mala K, Acharya S. Resin-based composite as a direct esthetic restorative material. Compend Contin Educ Dent. 2011;32(5):14–23. quiz 4, 38. - PubMed
    1. Bahramian N, Atai M, Naimi-Jamal MR. Ultra-high-molecular-weight polyethylene fiber reinforced dental composites:Effect of fiber surface treatment on mechanical properties of the composites. Dent Mater. 2015;31(9):1022–1029. doi:10.1016/j.dental.2015.05.011. - PubMed
    1. Chiari MD, Rodrigues MC, Xavier TA, de Souza EM, Arana-Chavez VE, Braga RR. Mechanical properties and ion release from bioactive restorative composites containing glass fillers and calcium phosphate nano-structured particles. Dent Mater. 2015;31(6):726–733. doi:10.1016/j.dental.2015.03.015. - PubMed
    1. Maruo Y, Nishigawa G, Irie M, Yoshihara K, Minagi S. Flexural properties of polyethylene, glass and carbon fiber-reinforced resin composites for prosthetic frameworks. Acta Odontol Scand. 2015;73(8):581–587. doi:10.3109/00016357.2014.958875. - PubMed
    1. Scribante A, Massironi S, Pieraccini G, Vallittu P, Lassila L, Sfondrini MF, et al. Effects of nanofillers on mechanical properties of fiber-reinforced composites polymerized with light-curing and additional postcuring. J Appl Biomater Funct Mater. 2015;13(3):e296–299. doi:10.5301/jabfm.5000226. - PubMed

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