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-71-PROIMPACT2624 The Mechanical Properties of a High-impact Acrylic Denture Base ResinPoster Presentation3:45 PM–5:00 PM Mar 24, 2017CC, First Floor Authors:Authors:HironoSasaki (Presenter)Fukuoka Dental CollegeIppeiHamanaka, Fukuoka Dental CollegeTomohiro Kawaguchi, Fukuoka Dental CollegePekkaVallittu, University of TurkuLippoLassila, universtyof turkuYutaka Takahashi, Fukuoka Dental CollegeAbstract: Objectives: Aim of this study was to determine the mechanical properties of high-impact acrylic denture base resins.Methods: Two denture base materials were evaluated (Proimpact, GC and Lucitone199, DENTSPLY). The three-point bending test specimens were fabricated according to the ISO 20795-1 (65x10x3.3mm). The impact strength test was applied a Charpyimpact strength test (size 50x6x4mm). The fracture toughness specimens of each denture base material tested were fabricated according to the ISO 20795-1 (size 8x4x36mm). A pre-notch of 3 mm was formed in fabricated according to the ISO 20795-1 (size 8x4x36mm). A pre-notch of 3 mm was formed in the center of the specimen followed by a sharp notch using a razor blade. Water stored groups were immersed in distilled water at 37 degrees for 48±2 h. The flexural strength at the proportional limit (MPa), the impact strength (kJ/m2), the maximum stress intensity factor (Kmax) (MPam1/2) and the total fracture work (Wf) (J/m2) were measured. Microstructure and surface hardness of denture base materials were evaluated using microscope techniques. Statistical analysis was carried with ANOVA and pearsoncorrelation.Results: Summary of results are shown in the table.Results: Summary of results are shown in the table.Same superscript letter shows no statistical differences (TUKEY, p<0.05).Fracture energy and impact strength revealed strong correlation to each other 0.731 (p<0.01) impact strength, fracture toughness and flexural strength had no correlation.Conclusions: The results of this study suggest that, Proimpacthas higher impact strength and fracture toughness compared to other acrylic denture base resin.Table(s):Flexural strength at the proportional limit (MPa)Impact strength (kJ/m2)Kic (Mpa m1/2)W (J/m2)Lucitone32.2(2.3)a3.14(0.15)a2.51(0.33)a1574.3(173.3)aStudent PresenterDisclosure 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: NONELucitone32.2(2.3)a3.14(0.15)a2.51(0.33)a1574.3(173.3)aProimpact29.0(2.3)a5.45(0.22)b2.80(0.32)b2438.0(563.4)bfollowing is submitted: NONEI have read the IADR policy on licensing.Signed by HironoSasakiReprinted with permission from the Journal of Dental Research, J Dent Res 96 (Spec Iss A):-71-abstract number 2624, https://iadr2017.zerista.com/event/member/336350, 2017