CHSJ

Curr Health Sci J, vol. 35, no. 1, 2009

Contributions on the Study of the Compressive Strength of the Light-Cured Composite Resins

[Original paper]

H. Manolea(1), Sonia Degeratu(2), V. Deva(1), Evantia Coles(1), Emma Draghici(1)


(1) Department of Morphology and Semiology of Stomatognate System, Dental Materials and Dental Prosthesis Technology , Faculty of Dentistry, UMF Craiova
(2)Faculty of Electromecanichs, University of Craiova


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



Corresponding: Assist. Univ. Manolea Horia MD, Department of Morphology and Semiology of Stomatognate System, Dental Materials and Dental Prosthesis Technology , Faculty of Dentistry, UMF Craiova, Str. Petru Rares, nr. 2-4 E-mail : manoleahoria @gmail.com


DOI 10.12865/CHSJ.35.01.11 - Download PDF
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