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. 2009 Jan;35(1):60-3.
Epub 2009 Mar 21.

Contributions on the study of the compressive strength of the light-cured composite resins

H Manolea  1 , Sonia Degeratu  2 , V Deva  1 , Evantia Coles  1 , Emma Draghici  1
Affiliations

Contributions on the study of the compressive strength of the light-cured composite resins

H Manolea et al. Curr Health Sci J. 2009 Jan.

Abstract

The mechanical properties of the light-cured composite resins are related to the material composition, but also vary according to the light-source characteristics used for polymerization. In this study we followed the compressive strength variation for a light-cured composite resin according to the time of exposure to the curing light. With that end in view,18 test pieces were made from a light-cured hybrid composite material (Filtek Z250). The test pieces where then submitted to a compressive force by a mechanical properties universal testing machine. Our results didn't show an increase of the compressive strength according to the light-curing time increasing, than only in the light-curing time limit indicated by the manufacturer. A longer light-curing time may induce a shrinkage polymerization growth with the formation of internal tensions inside the material. The composite materials light-curing in short layers as long as there is indicated by the manufacturer seems to be a safer method to make the best from a resin qualities, then an exaggerated increase of the light-curing time. The light-curing is indicated to be done in the direction of the compressive forces. To confirm this supposition other mechanical tests are also necessary.

Keywords: composite resins; compressive strength; light-curing time.

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Figures

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Fig. 3
The light-curing halogen unit XL 2500 from 3M ESPE
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The Universal Testing Machine for mechanical properties with a gamma from 0 to 1000kgF and a gradation of 2 kg
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Fig. 5
The graphical expression of the compression strength variation of the composite materials specimens according to the light-curing time
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Fig. 6
Drawing of complex stress pattern developed in cylinder subjected to compressive stress (modified from [8])
See this image and copyright information in PMC

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References

    1. Bratu D., et al. Materiale dentare în cabinetul de stomatologie. 2. Timisoara: Ed. Helicon; 1998. pp. 199–200.
    1. Kim K.H., Ong J.L., Okuno O. The effect of filler loading and morphology on the mechanical properties of contemporary composites. J Prosthet Dent. 2002 Jun;87(6):642–649. - PubMed
    1. Brandão L., Adabo G.L., Vaz L.G., Saad J.R. Compressive strength and compressive fatigue limit of conventional and high viscosity posterior resin composites. Braz Oral Res. 2005 Oct;Dec;19(4):272–277. - PubMed
    1. Manhart J., Kunzelmann K.H., Chen H.Y., Hickel R. Mechanical properties and wear behavior of light-cured packable composite resins. Dent Mater. 2000 Juan;16(1):33–40. - PubMed
    1. Jandt K.D., Mills R.W., Blackwell G.B., Ashworth S.H. Depth of cure and compressive strength of dental composites cured with blue light emitting diodes (LEDs) Dent Mater. 2000 Juan;16(1):41–47. - PubMed

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