title: Evaluation of microhardness, surface roughness, and wear behavior of different types of resin composites polymerized with two different light sources.
abstract: The microhardness, surface roughness and wear resistance of different types of resin composites, polymerized by a Quartz Tungsten Halogen (QTH) or Light Emitting Diode (LED) light curing units (LCU) were evaluated in this in vitro study. Cylindrical blocks were prepared from composites (8 mm in diameter, and 2 mm in thickness) and polymerized by a LED or a QTH LCU. Vickers hardness was measured on the top and bottom surfaces of the specimens. Surface roughness was measured with a surface profilometer on the top of the specimens. For the wear test, specimens were tested in a conventional pin-on-disc tribology machine under 15 N loads. The statistical analyses were performed by one-way analysis of variance (ANOVA) and t-tests, including the Bonferroni correction. Nanocomposite material Clearfil Majesty Posterior showed the highest hardness values in all polymerization types at the top and bottom surfaces (p < 0.05). Microhybrid Clearfil APX and hybrid Quixfil composites demonstrated the greatest surface roughness. Wear resistance of Clearfil Majesty Posterior was found to be the highest among the other tested resin composites. The results indicated that Clearfil Majesty Posterior demonstrated higher microhardness, less surface roughness, and higher wear resistance when compared with the other tested materials for both polymerization types.
authors: Department of Endodontics and Conservative Dentistry, Gulhane Military Medical Academy, Ankara, Turkey. fulyatoksoy@yahoo.com
authors: Fulya Toksoy
authors: FT
authors: Topcu
authors: Ugur
authors: U
authors: Erdemir
authors: Gunes
authors: G
authors: Sahinkesen
authors: Esra
authors: E
authors: Yildiz
authors: Ibrahim
authors: I
authors: Uslan
authors: Cengizhan
authors: C
authors: Acikel
mesh_terms: D003188:Composite Resins / Q000138:chemical synthesis / Q000737:chemistry* / Q000528:radiation effects; D003627:Data Interpretation, Statistical; D006244:Hardness; D006245:Hardness Tests; D008027:Light; D008422:Materials Testing / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D011108:Polymers / Q000737:chemistry; D011475:Prosthesis Failure; D013499:Surface Properties
chemical_list: D003188:Composite Resins; D011108:Polymers