Detail of "72869-86-4"

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Setting and flexural properties of metal-resin composite using Ag-Cu particles as filler and chemical accelerator

Setting and flexural properties of metal-resin composite using Ag-Cu particles as filler and chemical accelerator. Soma, Hiroko; Miyagawa, Yukio; Ogura, Hideo (Developmental Science of Oral Biomaterials, Graduate School of Dentistry at Niigata, The Nippon Dental University, Niigata 951-8580, Japan). Dental Materials Journal, 22(4), 543-555 (English) 2003 Japan Society for Dental Materials and Devices. CODEN: DMJOD5. ISSN: 0287-4547. DOCUMENT TYPE: Journal CA Section: 63 (Pharmaceuticals) A metal-resin composite material was exptl. prepd. by mixing a powder consisting of Ag-Cu particles and BPO with a paste consisting of UDMA-based monomer and 4-META in the absence of tertiary amine. The working time and setting time were mainly affected by the amts. of 4-META, BPO and metal particles, most of them fulfilling the requirements for working time and setting time specified in ISO 4 in the present exptl. conditions. The flexural strength ranged from 49.6 MPa to 77.8 MPa, and the highest value was obtained when the 4-META concn. was high and metal particle content was low. The flexural modulus of elasticity, ranging from 6.7 GPa to 11.9 GPa, significantly increased as the 4-META concn. and metal particle content increased. Based on its mech. properties, this metal-resin composite in which metal particles are involved in the polymn. initiation system has the potential to be used as a dental restorative material.Except for chemicals metioned above, 12614-83-4 and 72869-86-4 are also used. .

Network structure of Bis-GMA- and UDMA-based resin systems

All Rights Reserved. Network structure of Bis-GMA- and UDMA-based resin systems. Floyd, Cynthia J. E.; Dickens, Sabine H. (American Dental Association Foundation, Paffenbarger Research Center, National Institute of Standards and Technology, Gaithersburg, MD 20899-8546, USA). Dental Materials, 22(12), 1143-1149 (English) 2006 Elsevier Ltd. CODEN: DEMAEP. ISSN: 0109-5641. DOCUMENT TYPE: Journal CA Section: 63 (Pharmaceuticals) Objectives: The commonly used dental base monomers 2,2-bis[p-(2'-hydroxy-3'-methacryloxypropoxy)phenylene]propane (Bis-GMA) and 1,6-bis(methacryloxy-2-ethoxycarbonylamino)-2,4,4-trimethylhexane (UDMA) require the use of a diluent monomer, such as triethylene glycol dimethacrylate (TEGDMA). The aim of this study was to measure double bond conversion of UDMA/TEGDMA and Bis-GMA/TEGDMA polymeric systems, det. the leachable portion, and analyze network formation by evaluating crosslinking and pendant double bonds. Methods: UDMA or Bis-GMA was combined with TEGDMA in systematic increments and irradiated to form light cured polymers. Fourier transform IR spectroscopy in the near-IR region was used to measure double bond conversion. The leachable sol fraction was analyzed by 1H NMR. Resin composites were formulated. Flexural strength was measured by three-point bending and volumetric shrinkage was detd. with a mercury dilatometer. Results: The amt. of base monomer greatly influenced double bond conversion, sol fraction, and crosslinking. Increasing base monomer concn. decreased double bond conversion, increased the leachable fraction, and decreased crosslinking and network formation. At mole fractions higher than 0.125, the UDMA polymers had significantly higher conversion than the Bis-GMA polymers. Bis-GMA polymers had higher leachable amts. of unreacted monomer, while UDMA mixts. had more crosslinking than the Bis-GMA mixts. In regards to the phys. 72869-86-4 and 109-16-0 are just another two chemicals used in this study. properties of resin composites, increasing the base monomer improved flexural strength and decreased volumetric shrinkage. Significance: This systematic study for the evaluation of conversion, leachability, crosslinking, and network structure along with phys. properties, like volumetric shrinkage and flexural strength, are required for the optimization of competing desirable properties for the development of durable materials. .