Linyong Song1, Qiang Ye2, Xueping Ge1, Anil Misra3, Paulette Spencer4. 1. University of Kansas, Bioengineering Research Center, 1530W. 15th Street, Lawrence, KS 66045-7609, USA. 2. University of Kansas, Bioengineering Research Center, 1530W. 15th Street, Lawrence, KS 66045-7609, USA. Electronic address: yeq@ku.edu. 3. Department of Civil, Environmental and Architectural Engineering, University of Kansas, 1530W. 15th Street, Lawrence, KS 66045-7609, USA. 4. University of Kansas, Bioengineering Research Center, 1530W. 15th Street, Lawrence, KS 66045-7609, USA; Department of Mechanical Engineering, University of Kansas, 1530W. 15th Street, Lawrence, KS 66045-7609, USA. Electronic address: pspencer@ku.edu.
Abstract
OBJECTIVES: The purpose of this study was to evaluate the polymerization behavior of a model dentin adhesive with tris(trimethylsilyl)silane (TTMSS) as a co-initiator, and to investigate the polymerization kinetics and mechanical properties of copolymers in dry and wet conditions. METHODS: A co-monomer mixture based on HEMA/BisGMA (45/55, w/w) was used as a model dentin adhesive. The photoinitiator system included camphorquinone (CQ) as the photosensitizer and the co-initiator was ethyl-4-(dimethylamino) benzoate (EDMAB) or TTMSS. Iodonium salt, diphenyliodonium hexafluorophosphate (DPIHP) serving as a catalyst, was selectively added into the adhesive formulations. The control and the experimental formulations were characterized with regard to the degree of conversion (DC) and dynamic mechanical properties under dry and wet conditions. RESULTS: In two-component photoinitiator system (CQ/TTMSS), with an increase of TTMSS concentration, the polymerization rate and DC of CC double bond increased, and showed a dependence on the irradiation time and curing light intensity. The copolymers that contained the three-component photoinitiator system (CQ/TTMSS/DPIHP) showed similar dynamic mechanical properties, under both dry and wet conditions, to the EDMAB-containing system. SIGNIFICANCE: The DC of formulations using TTMSS as co-initiator showed a strong dependence on irradiation time. With the addition of TTMSS, the maximum polymerization rate can be adjusted and the network structure became more homogenous. The results indicated that the TTMSS could be used as a substitute for amine-type co-initiator in visible-light induced free radical polymerization of methacrylate-based dentin adhesives.
OBJECTIVES: The purpose of this study was to evaluate the polymerization behavior of a model dentin adhesive with tris(trimethylsilyl)silane (TTMSS) as a co-initiator, and to investigate the polymerization kinetics and mechanical properties of copolymers in dry and wet conditions. METHODS: A co-monomer mixture based on HEMA/BisGMA (45/55, w/w) was used as a model dentin adhesive. The photoinitiator system included camphorquinone (CQ) as the photosensitizer and the co-initiator was ethyl-4-(dimethylamino) benzoate (EDMAB) or TTMSS. Iodonium salt, diphenyliodonium hexafluorophosphate (DPIHP) serving as a catalyst, was selectively added into the adhesive formulations. The control and the experimental formulations were characterized with regard to the degree of conversion (DC) and dynamic mechanical properties under dry and wet conditions. RESULTS: In two-component photoinitiator system (CQ/TTMSS), with an increase of TTMSS concentration, the polymerization rate and DC of CC double bond increased, and showed a dependence on the irradiation time and curing light intensity. The copolymers that contained the three-component photoinitiator system (CQ/TTMSS/DPIHP) showed similar dynamic mechanical properties, under both dry and wet conditions, to the EDMAB-containing system. SIGNIFICANCE: The DC of formulations using TTMSS as co-initiator showed a strong dependence on irradiation time. With the addition of TTMSS, the maximum polymerization rate can be adjusted and the network structure became more homogenous. The results indicated that the TTMSS could be used as a substitute for amine-type co-initiator in visible-light induced free radical polymerization of methacrylate-based dentin adhesives.
Authors: Linyong Song; Qiang Ye; Xueping Ge; Anil Misra; Jennifer S Laurence; Cynthia L Berrie; Paulette Spencer Journal: J Biomed Mater Res B Appl Biomater Date: 2014-03-05 Impact factor: 3.368
Authors: Eliseu A Münchow; Lisia L Valente; Sonia L Peralta; María Raquel Fernández; Giana da S Lima; Cesar L Petzhold; Evandro Piva; Fabrício A Ogliari Journal: J Biomed Mater Res B Appl Biomater Date: 2013-04-06 Impact factor: 3.368
Authors: Luis Felipe J Schneider; Carmem S C Pfeifer; Simonides Consani; Scott A Prahl; Jack L Ferracane Journal: Dent Mater Date: 2008-03-05 Impact factor: 5.304