title: Silorane- and high filled-based "low-shrinkage" resin composites: shrinkage, flexural strength and modulus.
abstract: This study compared the volumetric shrinkage (VS), flexural strength (FS) and flexural modulus (FM) properties of the low-shrinkage resin composite Aelite LS (Bisco) to those of Filtek LS (3M ESPE) and two regular dimethacrylate-based resin composites, the microfilled Heliomolar (Ivoclar Vivadent) and the microhybrid Aelite Universal (Bisco). The composites (n = 5) were placed on the Teflon pedestal of a video-imaging device, and VS was recorded every minute for 5 min after 40 s of light exposure. For the FS and FM tests, resin discs (0.6 mm in thickness and 6.0 mm in diameter) were obtained (n = 12) and submitted to a piston-ring biaxial test in a universal testing machine. VS, FS, and FM data were submitted to two-way repeated measures and one-way ANOVA, respectively, followed by Tukey's post-hoc test (a = 5%). Filtek LS showed lower VS than did Aelite LS, which in turn showed lower shrinkage than did the other composites. Aelite Universal and Filtek LS exhibited higher FS than did Heliomolar and Aelite LS, both of which exhibited the highest FM. No significant difference in FM was noted between Filtek LS and Aelite Universal, while Heliomolar exhibited the lowest values. Aelite LS was not as effective as Filtek LS regarding shrinkage, although both low-shrinkage composites showed lower VS than did the other composites. Only Filtek LS exhibited FS and FM comparable to those of the regular microhybrid dimethacrylate-based resin composite.
authors: Univ Estadual de Ponta Grossa -UEPG, Department of Operative Dentistry, Ponta Grossa, PR, Brazil. cesararrais@yahoo.com.br
authors: Cesar Augusto Galvão
authors: CA
authors: Arrais
authors: Marcelo Tavares de
authors: MT
authors: Oliveira
authors: Donald
authors: D
authors: Mettenburg
authors: Frederick Allen
authors: FA
authors: Rueggeberg
authors: Marcelo
authors: M
authors: Giannini
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D003799:Dental Stress Analysis; D055119:Elastic Modulus; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D011140:Polyurethanes / Q000737:chemistry*; D062047:Silorane Resins / Q000737:chemistry*; D013499:Surface Properties; D013718:Tensile Strength; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; C485363:Aelite LS; D003188:Composite Resins; C543062:Filtek LS Low Shrink resin; C513708:Heliomolar; D008689:Methacrylates; D011140:Polyurethanes; D062047:Silorane Resins; C555513:silorane composite resin