Compressive strength and the effect of duration after photo-activation among dual-cure bulk fill composite core materials | Alkhudhairy | Pakistan Journal of Medical Sciences
 
مبل راحتی صندلی مدیریتی صندلی اداری میز اداری وبلاگدهی گن لاغری بازی اندروید تبلیغات کلیکی آموزش زبان انگلیسی پاراگلایدر مارکت اندروید تور آهنگ محسن چاوشی مسیح و آرش پروتز سینه پروتز باسن پروتز لب میز تلویزیون

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

Fahad Alkhudhairy, Fahim Vohra

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.

doi: http://dx.doi.org/10.12669/pjms.325.10727

How to cite this:Alkhudhairy F, Vohra F. Compressive strength and the effect of duration after photo-activation among dual-cure bulk fill composite core materials. Pak J Med Sci. 2016;32(5):1199-1203.   doi: http://dx.doi.org/10.12669/pjms.325.10727

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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