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-57-CERASMART, Casting Gold M.C. TypeIII0720 Relationship Between Wear and Frictional Resistance of Dental Restorative MaterialsPoster Presentation11:00 AM–12:15 PM Mar 23, 2017CC, First Floor Authors:Authors:Kiyoshi Kakuta, The Nippon Dental UniversityMikuKoide, The Nippon Dental UniversityYukio Miyagawa(Presenter)The Nippon Dental UniversityAbstract: Objectives: Wear is a complicated phenomenon. The aim of this study was to clarify the Objectives: Wear is a complicated phenomenon. The aim of this study was to clarify the relationship between occlusalwear and frictional resistance of dental restorative materials with various hardness.Methods: Tested materials in order of Vickers hardness (HV0.3) were: three hybrid-resin blocks for CAD/CAM (Cerasmart(CS), GC; ShofuBlock HC (HC), Shofu; KZR-CAD HR (HR), Yamamoto Precious Metal); two polymer-based Cr&Brmaterials (Ceramage(CE), Shofu; EsteniaC&B (ES), Kuraray Noritake Dental); one gold-casting alloy (Casting Gold M.C. TypeIII(CG), GC); and one dental porcelain (Vintage ZR (VT), Shofu). Both-way wear test was performed using a surface property tester (Type 32, Heidon, Japan). A spherical tip of antagonist made of VT slid 2mm on a property tester (Type 32, Heidon, Japan). A spherical tip of antagonist made of VT slid 2mm on a flat wear specimen in reciprocating motion 1000 times under 5N and its frictional resistance force (FrF) was measured. Then, a surface profile of wear track was measured using a 3D-measuring microscope. Wear volume (WeV) per 1 mm length at center of wear track and average wear depth (AvD) were computed from the surface profile data (n=3). Effects of material were analyzed (ANOVA, Tukey’sor Games-Howell, p<0.05). The relationships between the obtained data including HV0.3 were also analyzed statistically.Results: FrFvalues tended to fluctuate before 400 cycles, therefore the average value after 400 cycles was used for analysis. Means of FrF(N) with statistical subgroups in superscripts were: cycles was used for analysis. Means of FrF(N) with statistical subgroups in superscripts were: CG;0.65a, CS;1.98b, HR;2.79c, HC;2.83c, CE;3.91d, VT;3.98dand ES;4.23d. Means of WeV(mm3x106) were: CG;367a, CS;667a, HC;1133a,b, VT;2300b, HR;2567b, ES;5367cand CE;5600c. There was a linear correlation between WeVand AvD(r=0.988, p<0.001). AvD(mm) could be expressed by FrFusing the following exponential regression equation (r2=0.874, p<0.001): AvD=0.6489x1.743^FrF. The correlation coefficient between AvDand HV0.3 was -0.085 (p>0.05).Conclusions: In this study, wear properties of restorative materials correlated exponentially well with frictional resistance force regardless of hardness.Reprinted with permission from the Journal of Dental Research, J Dent Res 96 (Spec Iss A):-57-abstract number 0720, https://iadr2017.zerista.com/poster/member/75948, 2017