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-34-MI GRACEFIL/G-ænialSculpt0666 Wear Properties of Esthetic Dental Materials Against Translucent ZirconiaPoster Presentation11:00 AM–12:15 PM Mar 23, 2017CC, First FloorAuthors:Authors:ShotaHayashi (Presenter)Tokyo Dental CollegeShinya Homma, Tokyo Dental CollegeTomoki Hirano, Tokyo Dental CollegeRyotaroNakano, Tokyo Dental CollegeKei Sakamoto, Tokyo Dental CollegeShinji Takemoto, Tokyo Dental CollegeMasao Yoshinari, Tokyo Dental CollegeMasao Yoshinari, Tokyo Dental CollegeYasutomoYajima, Tokyo Dental CollegeAbstract: Objectives: Fixed dental prostheses using translucent tetragonal zirconiapolycrystals(TZPs) enables achieving the improved esthetic results with high strength. Full-contour monolithic ceramic restorations using translucent TZP could overcome chipping conventional veneered porcelain on opaque TZP frameworks. However, there is little information about the wear porcelain on opaque TZP frameworks. However, there is little information about the wear behavior between translucent monolithic TZP and esthetic dental materials. The purpose of this in vitro study was to investigate the wear behavior of esthetic dental materials including pressableglass-ceramic, dental porcelain and resin composites against translucent TZP.Methods: Cylindrical translucent TZPs (Zpex100, Tosoh) were used as abrader specimen with one hemispherical end (radius of curvature of 2.5 mm). As substrate specimens, pressableglass-ceramic (GCLD; IPS e.max Press, IvoclarVivadent, Liechtenstein), dental porcelain (DPC; Vintage Halo, Shofu, Japan), and resin composites that involved nano-filler filled (NFCR; MI Gracefil, GC) and hybrid-filler filled (HFCR; ClearfilAP-X, Kuraray Noritake Dental) were used. Gracefil, GC) and hybrid-filler filled (HFCR; ClearfilAP-X, Kuraray Noritake Dental) were used. Surfaces of abrader specimens and substrate specimens were finally polished with finishing instruments and 0.3 µm-alumina suspension using a polishing machine, respectively. A two-body wear test was performed using an automatic wear simulator for 30,000 cycles at a speed of 90 cycles/min and with a vertical load of 10 N in distilled water. The wear volumes of substrate specimens was determined using a 3D laser microscope (LEXT OLS4000, Olympus) and surfaces of abrader specimens was observed using 3D scanning electron microscope(ERA-8900FE, Elionix) before and after the wear test.Results: Wear volume of substrates showed GCLD >DPC >HFCR>NFCR in this order. Abrader Results: Wear volume of substrates showed GCLD >DPC >HFCR>NFCR in this order. Abrader specimens after test toward ceramics (GCLD and DPC) were observed to increasing roughness than resin composite (NFCR and HFCR).Conclusions: TZP abrader on tow body wear test indicated rougher surface for ceramics of substrate than for resin composite, and also that wear volume of ceramics substrate increased.Disclosure 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: NONEfollowing is submitted: NONEI have read the IADR policy on licensing.Signed by ShotaHayashiReprinted with permission from the Journal of Dental Research, J Dent Res 96 (Spec Iss A):-34-abstract number 0666, https://iadr2017.zerista.com/event/member/330651, 2017

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