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-25-G-CEM LinkForce, initial LiSiPress1958 Wear Resistance of a New Resin-cement, G-CEM LinkForcePoster Presentation11:00 AM–12:15 PM Mar 24, 2017CC, First FloorAuthors:Authors:NaofumiMatsumoto (Presenter)GC CorporationAkishiArita, GC CorporationTomohiro Kumagai, GC CorporationAbstract: Objectives: Lithium-silicate glass-ceramics are frequently used for inlay restorations. In these cases, a cement-line is exposed at the surface. The cement can wear selectively because resin-cases, a cement-line is exposed at the surface. The cement can wear selectively because resin-cement is weaker than the restoration or tooth structure. This study evaluated wear resistance of a cement line using three body wear test and compared a new resin-cement, G-CEM LinkForce(LF, GC) and other resin-cements.Methods: Resin-cement materials examined in this study were G-CEM LinkForce, Multilink Automix(MA, IvoclarVivadent), RelyXUltimate(RU, 3M ESPE), PanaviaV5(PV, Kuraray), Calibra(CL, DENTSPLY) and eCEMENT(EC, BISCO). Specimens were prepared by cementing(light-curing mode) bovine enamel and a lithium-silicate glass-ceramic(Initial LiSiPress, LiSi, GC) with each resin-cement according to manufacturers’ instructions(the cement-layer was set at 100 µm each resin-cement according to manufacturers’ instructions(the cement-layer was set at 100 µm using plastic tape), stored in 37°C distilled water for 7 days. Sample was cut perpendicularly to expose cement-layer, consisting of sandwiched enamel and LiSi. Exposed cement-layer was subjected to three body wear test wear machine(K842-01, TOKYO-GIKEN) with 300g load for 100,000-cycles. Specimens were placed 10mm into PMMA-block and reciprocated 8mm-length parallel to cement-line in the slurry mixture of PMMA-particles and glycerin. Wear depth was compared by measuring difference in level between worn cement-line and LiSisurface(n=10).Results: Mean values(SD) are shown below. Same letter indicates no significant difference(ANOVA, Tukey’s, p<0.01). G-CEM LinkForceshowed significantly lower wear depth difference(ANOVA, Tukey’s, p<0.01). G-CEM LinkForceshowed significantly lower wear depth than other resin-cements tested. This result means G-CEM LinkForcehas the highest wear resistance.Conclusions: G-CEM LinkForcedemonstrates the highest wear resistance among the resin-cements tested. This result suggests that G-CEM LinkForceis suitable resin-cement for inlay restorations and probably other indirect restorations.Table(s):Resin-cementLFMARUPVCLECDisclosure Statement:The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: NONEI have read the IADR policy on licensing.Resin-cementLFMARUPVCLECManufacturerGCIvoclar Vivadent3M ESPEKurarayDENTSPLYBISCOWear depth[micro-meter]0.43(0.11)A6.93(1.21)B10.34(1.20)C16.73(1.82)D7.74(0.92)B7.04(0.61)BI have read the IADR policy on licensing.Signed by NaofumiMatsumotoReprinted with permission from the Journal of Dental Research, J Dent Res 96 (Spec Iss A):-25-abstract number 1958, https://iadr2017.zerista.com/event/member/336362, 2017