Biphenyl liquid crystalline epoxy resin as a low-shrinkage resin-based dental restorative nanocomposite |
| |
| Authors: | Sheng-Hao Hsu Rung-Shu Chen Yuan-Ling Chang Min-Huey Chen Kuo-Chung Cheng Wei-Fang Su |
| |
| Affiliation: | 1. Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan;2. School of Dentistry, College of Medicine, National Taiwan University, Taipei, Taiwan;3. Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan;4. Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan;5. Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, Taipei, Taiwan;1. School of Materials Science and Engineering, South China University of Technology, 381 Wushan Road, Tianhe District, Guangzhou 510641, China;2. Key lab of Guangdong Province for High Property and Functional Macromolecular Materials, South China University of Technology, Gunagzhou 510641, China;1. State Key laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi’an 710032, China;2. Department of Endodontics, Prosthodontics and Operative Dentistry, University of Maryland Dental School, Baltimore, MD 21201, USA;3. Dr Anthony Volpe Research Center, American Dental Association Foundation (ADAF), National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;4. Biomaterials Group, Biosystems & Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;5. Center for Stem Cell Biology & Regenerative Medicine, University of Maryland School of Medicine, Baltimore, MD 21201, USA;6. Department of Mechanical Engineering, University of Maryland, Baltimore County, MD 21250, USA;1. Dr. Anthony Volpe Research Center, American Dental Association Foundation, Gaithersburg, MD 20899, USA;2. Biomaterials Group, Biosystems and Biomaterials Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;3. Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA;1. Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO, USA;2. Department of Craniofacial Biology, School of Dental Medicine, Anschutz Medical Campus, Aurora, CO, USA |
| |
| Abstract: | Low-shrinkage resin-based photocurable liquid crystalline epoxy nanocomposite has been investigated with regard to its application as a dental restoration material. The nanocomposite consists of an organic matrix and an inorganic reinforcing filler. The organic matrix is made of liquid crystalline biphenyl epoxy resin (BP), an epoxy resin consisting of cyclohexylmethyl-3,4-epoxycyclohexanecarboxylate (ECH), the photoinitiator 4-octylphenyl phenyliodonium hexafluoroantimonate and the photosensitizer champhorquinone. The inorganic filler is silica nanoparticles (～70–100 nm). The nanoparticles were modified by an epoxy silane of γ-glycidoxypropyltrimethoxysilane to be compatible with the organic matrix and to chemically bond with the organic matrix after photo curing. By incorporating the BP liquid crystalline (LC) epoxy resin into conventional ECH epoxy resin, the nanocomposite has improved hardness, flexural modulus, water absorption and coefficient of thermal expansion. Although the incorporation of silica filler may dilute the reinforcing effect of crystalline BP, a high silica filler content (～42 vol.%) was found to increase the physical and chemical properties of the nanocomposite due to the formation of unique microstructures. The microstructure of nanoparticle embedded layers was observed in the nanocomposite using scanning and transmission electron microscopy. This unique microstructure indicates that the crystalline BP and nanoparticles support each other and result in outstanding mechanical properties. The crystalline BP in the LC epoxy resin-based nanocomposite was partially melted during exothermic photopolymerization, and the resin expanded via an order-to-disorder transition. Thus, the post-gelation shrinkage of the LC epoxy resin-based nanocomposite is greatly reduced, ～50.6% less than in commercialized methacrylate resin-based composites. This LC epoxy nanocomposite demonstrates good physical and chemical properties and good biocompatibility, comparable to commercialized composites. The results indicate that this novel LC nanocomposite is worthy of development and has potential for further applications in clinical dentistry. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
