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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 DH, Mai HN, Yang JC, Kwon TY - J Adv Prosthodont (2015)

Bottom Line: Two-way analysis of variance and the Duncan post hoc test were used to analyze statistically significant differences between the groups and given times (α=.05).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.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.

ABSTRACT

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, ø5 mm × 1 mm) 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: 840 mW/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 (α=.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.

No MeSH data available.


Related in: MedlinePlus

Specimen fabrication; A small amount of freshly mixed material was placed into a silicone mold, and then covered with polyester film and a glass slide to be pressed.
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Figure 2: Specimen fabrication; A small amount of freshly mixed material was placed into a silicone mold, and then covered with polyester film and a glass slide to be pressed.

Mentions: Sixty cylindrical specimens (5.0 mm in diameter, 1.0 mm in height) were fabricated for two groups, with and without DEABP, and were light-irradiated for durations of 0, 10, 30, 60, 180, and 300 seconds with 5 specimens for each condition. The freshly mixed resins both with and without DEABP were poured into silicone molds, and then were covered by polyester film and 1.0 mm thick glass slides in sequence (Fig. 2). To apply standardized pressure, two circular weights (50.0 g each) were placed on both the left and right sides of the glass slides.


The effect of 4,4'-bis(N,N-diethylamino) benzophenone on the degree of conversion in liquid photopolymer for dental 3D printing.

Lee DH, Mai HN, Yang JC, Kwon TY - J Adv Prosthodont (2015)

Specimen fabrication; A small amount of freshly mixed material was placed into a silicone mold, and then covered with polyester film and a glass slide to be pressed.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644780&req=5

Figure 2: Specimen fabrication; A small amount of freshly mixed material was placed into a silicone mold, and then covered with polyester film and a glass slide to be pressed.
Mentions: Sixty cylindrical specimens (5.0 mm in diameter, 1.0 mm in height) were fabricated for two groups, with and without DEABP, and were light-irradiated for durations of 0, 10, 30, 60, 180, and 300 seconds with 5 specimens for each condition. The freshly mixed resins both with and without DEABP were poured into silicone molds, and then were covered by polyester film and 1.0 mm thick glass slides in sequence (Fig. 2). To apply standardized pressure, two circular weights (50.0 g each) were placed on both the left and right sides of the glass slides.

Bottom Line: Two-way analysis of variance and the Duncan post hoc test were used to analyze statistically significant differences between the groups and given times (α=.05).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.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.

ABSTRACT

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, ø5 mm × 1 mm) 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: 840 mW/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 (α=.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.

No MeSH data available.


Related in: MedlinePlus