sdj-10036

Study the effect of different shades and thickness on surface hardness of light cure composite restoration (A Comparative In Vitro Study)

Bassam Afram Hanna, Miwan Salahaldeen & Tavga Mustafa

College of Medicine, University of Sulaimani

DOI: https://doi.org/10.17656/sdj.10036

Abstract

Objectives: Study performed to determined the effect of cavity depth & shade of composite on surface microhardness of the restoration.

Materials and Methods: Eighty cylindrical specimens were prepared, (Group R) 40 specimens of Nano filled composanceram, divided into four subgroups(R1,2.5 mm,A1shade / R2, 2.5mm, C2 shade / R3,4.5mm, A1shade / R4, 4.5mm, C2shade). And (Group E) 40specimens of Micro hybrid, 3G SDI, divided into four subgroups as the same as first group. After curing with visible light cure 230v/50Hz, output 470 nm, measuring the Vicker Hardness number of top and bottom surface of each specimen, then analyzed by Student t-test.

Results: Showed highly significant in difference in relation between top and bottom surfaces for all subgroups,and also there was highly significant indifference in relation to different types of composite, while there was non-significant indifference in relation to difference in shade in case of thin thickness, while it was significant in difference in case of thick thickness of specimens.

Conclusions: In case of deep cavity it wise to use thinner composite increments to improve polymerization and should avoid thicker increment especially in a dark shade of composite.

Keywords: Vicker microhardness, shade, thickness composite filling

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