The Journal of Advanced Prosthodontics

  • 제7권5호
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  • Pages.386-391
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  • 2015
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  • 2005-7806(pISSN)
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  • 2005-7814(eISSN)
대한치과보철학회 (The Korean Academy of Prosthodonitics)
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The effect of 4,4'-bis(N,N-diethylamino)benzophenone on the degree of conversion in liquid photopolymer for dental 3D printing

  • Lee, Du-Hyeong (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Mai, Hang Nga (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Yang, Jin-Chul (Department of Polymer Science & Engineering, School of Applied Chemical Engineering, Kyungpook National University) ;
  • Kwon, Tae-Yub (Department of Dental Biomaterials, School of Dentistry, Kyungpook National University)
  • 투고 : 2015.06.01
  • 심사 : 2015.08.27
  • 발행 : 2015.10.30
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초록

PURPOSE. The purpose of this preliminary study was to investigate the effects of adding 4,4'-bis(N,N-diethylamino) benzophenone (DEABP) as a co-initiator to a binary photoinitiating system (camphorquinone-amine) to analyze on the degree of conversion (DC) of a light-cured resin for dental 3D printing. MATERIALS AND METHODS. Cylindrical specimens (N=60, n=30 per group, ${\phi}5mm{\times}1mm$) were fabricated using bisphenol A glycerolate dimethacrylate (BisGMA) both with and without DEABP. The freshly mixed resins were exposed to light in a custom-made closed chamber with nine light-emitting diode lamps (wavelength: 405 nm; power: $840mW/cm^2$) for polymerization at each incidence of light-irradiation at 10, 30, 60, 180, and 300 seconds, while five specimens at a time were evaluated at each given irradiation point. Fourier-transform infrared (FTIR) spectroscopy was used to measure the DC values of the resins. Two-way analysis of variance and the Duncan post hoc test were used to analyze statistically significant differences between the groups and given times (${\alpha}$=.05). RESULTS. In the DEABP-containing resin, the DC values were significantly higher at all points in time (P<.001), and also the initial polymerization velocity was faster than in the DEABP-free resin. CONCLUSION. The addition of DEABP significantly enhanced the DC values and, thus, could potentially become an efficient photoinitiator when combined with a camphorquinone-amine system and may be utilized as a more advanced photopolymerization system for dental 3D printing.

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