title: Preparation and characterisation of poly p-phenylene-2,6-benzobisoxazole fibre-reinforced resin matrix composite for endodontic post material: a preliminary study.
abstract: OBJECTIVE
  Currently used fibre-reinforced composite (FRC) intracanal posts possess low flexural strength which usually causes post fracture when restoring teeth with extensive loss. To improve the flexural strength of FRC, we aimed to apply a high-performance fibre, poly p-phenylene-2, 6-benzobisoxazole (PBO), to FRCs to develop a new intracanal post material.
  
  
  METHODS
  To improve the interfacial adhesion strength, the PBO fibre was treated with coupling agent (Z-6040), argon plasma, or a combination of above two methods. The effects of the surface modifications on PBO fibre were characterised by determining the single fibre tensile strength and interfacial shear strength (IFSS). The mechanical properties of PBO FRCs were characterised by flexural strength and flexural modulus. The cytotoxicity of PBO FRC was evaluated by the MTT assay.
  
  
  RESULTS
  Fibres treated with a combination of Z-6040 and argon plasma possessed a significantly higher IFSS than untreated fibres. Fibre treated with the combination of Z-6040-argon-plasma FRC had the best flexural strength (531.51 ± 26.43MPa) among all treated fibre FRCs and had sufficient flexural strength and appropriate flexural moduli to be used as intracanal post material. Furthermore, an in vitro cytotoxicity assay confirmed that PBO FRCs possessed an acceptable level of cytotoxicity.
  
  
  CONCLUSIONS
  In summary, our study verified the feasibility of using PBO FRC composites as new intracanal post material. Although the mechanical property of PBO FRC still has room for improvement, our study provides a new avenue for intracanal post material development in the future.
  
  
  CONCLUSIONS
  To our knowledge, this is the first study to verify the feasibility of using PBO FRC composites as new intracanal post material. Our study provided a new option for intracanal post material development.
authors.affiliation: Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Hu
authors.affiliation: Department of Stomatology, Naval General Hospital of PLA, Beijing 100048, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.affiliation: Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China.
authors.forename: Huiyong
authors.initials: H
authors.lastname: Yang
authors.affiliation: Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Ai
authors.affiliation: Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
authors.forename: Linlin
authors.initials: L
authors.lastname: Wang
authors.affiliation: Nanfang Hospital, Southern Medical University, Guangzhou 510515, China.
authors.forename: Dongdong
authors.initials: D
authors.lastname: Jing
authors.affiliation: Nanfang Hospital, Southern Medical University, Guangzhou 510515, China. Electronic address: shaolongquan@smu.edu.cn.
authors.forename: Longquan
authors.initials: L
authors.lastname: Shao
authors.affiliation: Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China. Electronic address: zhouxingui@nudt.edu.cn.
authors.forename: Xingui
authors.initials: X
authors.lastname: Zhou
mesh_terms: D000818:Animals; D001128:Argon / Q000737:chemistry; D003516:Cycloparaffins / Q000737:chemistry* / Q000633:toxicity; D003764:Dental Materials / Q000737:chemistry* / Q000633:toxicity; D055119:Elastic Modulus; D004853:Epoxy Resins / Q000737:chemistry* / Q000633:toxicity; D005240:Feasibility Studies; D008422:Materials Testing; D051379:Mice; D008855:Microscopy, Electron, Scanning; D041681:NIH 3T3 Cells / Q000187:drug effects; D010080:Oxazoles / Q000737:chemistry* / Q000633:toxicity; D056951:Photoelectron Spectroscopy; D058626:Plasma Gases / Q000737:chemistry; D018583:Pliability; D011108:Polymers / Q000737:chemistry* / Q000633:toxicity; D011176:Post and Core Technique / Q000295:instrumentation*; D033081:Shear Strength; D013055:Spectrophotometry, Infrared; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D003516:Cycloparaffins; D003764:Dental Materials; D004853:Epoxy Resins; D010080:Oxazoles; D058626:Plasma Gases; D011108:Polymers; C450140:poly(4-phenylene-2,6-benzobisoxazole); C509547:poly-para-phenylene; D001128:Argon
keywords: Dental post; Epoxy resin; Fibre reinforced composite; Flexural strength; PBO fibre; Surface modification