| 2585 Vinyloligosilsesquioxane added to Denture-base Acrylic Resin Can Improve Bond Strength to Dental Porcelain | ||
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J.S. SHIM1, W.G. ROH1, S.J. HEO2, D.J. CHUNG3, and D.H. HAN1, 1 Yonsei University, Seoul, South Korea, 2 Seoul National University & IBEC, South Korea, 3 Sungkyunkwan University, Suwon Kyungki, South Korea Objectives: Pilot study showed cohesive failure pattern between porcelain artificial denture teeth and vinyloligosilsesquioxane(POSS) added acrylic resin in tensile strength test.To compare bond strength of dental porcelain with conventional PMMA denture base resin and with POSS added one, shear bond stregth was measured. Method: Forty of 5x4x1.5 mm porcelain specimens were made with DuceraTM dentin powder. Heat cured acrylic denture base resin was cured on the porcelain piece with pressure molding method. Paladent20TM denure base acrylic resin was used as a control. POSS were mixed in monomer liquid as much as 3.9 vol%. Shear bond strengths were measured using InstronTM testing machine at the cross head speed of 1 mm/min. Data were examined statistically with independent samples t-test at the alpha =0.05. Results: Mean shear bond strength was 3.83 MPa(SD 1.91) for control group and 62.45 MPa(SD 20.34) for experimental group respectively.Calculated p value was 0.00. All specimens' fractured surface in experimental group were covered with porcealin at least two-third of their area. Conclusions: POSS can improve shear bond strength between dental porcelain and acrylic denture base resin when added to methylmethacrylate monomer liquid. | ||
| Seq #264 - Clinical Simulation of Adhesion Properties and Adhesion to Metal/Ceramic Substrates 11:00 AM-12:15 PM, Saturday, 28 June 2003 Svenska Massan Exhibition Hall B | ||
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Back to the Dental Materials: II - Adhesion-Other Program
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