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-61-initial LiSiPress0662 The Fitness of Crowns Fabricated by New Dental PressableCeramicsPoster Presentation11:00 AM–12:15 PM Mar 23, 2017CC, First FloorAuthors:Authors:KirikoSugano (Presenter)Tokyo Medical and Dental UniversityMayukoMatsumura, Tokyo Medical and Dental UniversityKenichiroHayashi, Tokyo Medical and Dental UniversityChiharu Shin, Tokyo Medical and Dental UniversityWataruKomada, Tokyo Medical and Dental UniversityTasukuInagaki, Tokyo Medical and Dental UniversityYojiUeda, Tokyo Medical and Dental UniversityYojiUeda, Tokyo Medical and Dental UniversityRieFujita, Tokyo Medical and Dental UniversityHiroyuki Miura, Tokyo Medical and Dental UniversityAbstract: Objectives: The purpose of this study was to evaluate the fitness of crowns made of the new pressableceramics by comparing with the conventional pressableceramics.Methods: A master model that assumed an abutment tooth of maxillary premolar was fabricated Methods: A master model that assumed an abutment tooth of maxillary premolar was fabricated with the dental cobalt chromium alloy. After the working cast model was prepared, ten wax patterns for crowns were fabricated with CAD/CAM technique. Five of them were used to fabricate the crowns made of the new pressableceramics (Initial LiSipress, GC Co.)(LI), and the others were used to the conventional pressableceramics (e.max press, IvoclarVivadentK.K.) (EM). The gap between each pressed crown and master model were replaced with occlusalcontact checking material and the part of master model were also replaced with white silicone. The gap width between each crown and master model at the cross section of bucco-lingual direction was measured by light section measuring microscope. In each crown, 8 points of gap direction was measured by light section measuring microscope. In each crown, 8 points of gap width from buccalmarginal area to lingual marginal area through top of abutment tooth were measured (“a” to “h”; “a” to “c” were in the measuring points of buccalarea, “d” and “e” were in the top of abutment tooth, “f” to “h” were in the measuring points of lingual area). The data of each measuring point were statistically analyzed with Levenetest and T-test (p<0.05).Results: The gap width of LI from buccalmarginal area to lingual marginal area were 55.8±17.0µm 58.8±11.19µm, 55.5±5.6µm, 124.5±29.4µm, 120.9±32.8µm, 66.1±19.5µm, 67.5±21.5µm, 61.2±20.1µm, respectively, and that of EM were 63.4±30.4µm, 62.5±27.4µm, 64.1±21.4µm, 164.6±33.1µm, 194.7±47.5µm, 61.9±27.4µm, 75.5±13.0µm, 77.7±16.9µm, 64.1±21.4µm, 164.6±33.1µm, 194.7±47.5µm, 61.9±27.4µm, 75.5±13.0µm, 77.7±16.9µm, respectively. There were no significant differences between LI and EM at all measuring points except for point “e “(p>0.05).Conclusions: The crown made of new pressableceramics had the same accuracy for adaptation as the conventional pressableceramics.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 KirikoSuganoReprinted with permission from the Journal of Dental Research, J Dent Res 96 (Spec Iss A):-61-abstract number 0662, https://iadr2017.zerista.com/event/member/330647, 2017