title: A resin composite material containing an eugenol derivative for intracanal post cementation and core build-up restoration.
abstract: OBJECTIVE
  To formulate and evaluate new dual cured resin composite based on the inclusion of eugenyl methacrylate monomer (EgMA) with Bis-GMA/TEGDMA resin systems for intracanal post cementation and core build-up restoration of endodontically treated teeth.
  
  
  METHODS
  EgMA was synthesized and incorporated at 5% (BTEg5) or 10% (BTEg10) into dual-cure formulations. Curing properties, viscosity, Tg, radiopacity, static and dynamic mechanical properties of the composites were determined and compared with Clearfil™DC Core-Plus, a commercial dual-cure, two-component composite. Statistical analysis of the data was performed with ANOVA and the Tukey's post-hoc test.
  
  
  RESULTS
  The experimental composites were successfully prepared, which exhibited excellent curing depths of 4.9, 4.7 and 4.2 mm for BTEg0, BTEg5 and BTEg10 respectively, which were significantly higher than Clearfil™DC. However, the inclusion of EgMA initially led to a lower degree of cure, which increased when measured at 24 h with values comparable to formulations without EgMA, indicating post-curing. The inclusion of EgMA also lowered the polymerization exotherm thereby reducing the potential of thermal damage to host tissue. Both thermal and viscoelastic analyses confirmed the ability of the monomer to reduce the stiffness of the composites by forming a branched network. The compressive strength of BTEg5 was significantly higher than the control whilst flexural strength increased significantly from 95.9 to 114.8 MPa (BTEg5) and 121.9 MPa (BTEg10). Radiopacity of the composites was equivalent to ∼3 mm Al allowing efficient diagnosis.
  
  
  CONCLUSIONS
  The incorporation of EgMA within polymerizable formulations provides a novel approach to prepare reinforced resin composite material for intracanal post cementation and core build-up and the potential to impart antibacterial properties of eugenol to endodontic restorations.
authors.affiliation: Division of Tissue Engineering & Biophotonics, King's College London Dental Institute, London, UK.
authors.forename: A
authors.initials: A
authors.lastname: Almaroof
authors.affiliation: Division of Tissue Engineering & Biophotonics, King's College London Dental Institute, London, UK.
authors.forename: L
authors.initials: L
authors.lastname: Rojo
authors.affiliation: Department of Conservative Dentistry, King's College London Dental Institute, London, UK.
authors.forename: F
authors.initials: F
authors.lastname: Mannocci
authors.affiliation: Division of Tissue Engineering & Biophotonics, King's College London Dental Institute, London, UK. Electronic address: sanjukta.deb@kcl.ac.uk.
authors.forename: S
authors.initials: S
authors.lastname: Deb
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003799:Dental Stress Analysis; D017886:Durapatite / Q000737:chemistry; D006244:Hardness; D008422:Materials Testing; D008689:Methacrylates / Q000138:chemical synthesis*; D008855:Microscopy, Electron, Scanning; D011092:Polyethylene Glycols / Q000737:chemistry; D058105:Polymerization; D011109:Polymethacrylic Acids / Q000737:chemistry; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry*; D014783:Viscosity; D015040:Zirconium / Q000737:chemistry
chemical_list: C469237:Clearfil Core; D003188:Composite Resins; D008689:Methacrylates; D011109:Polymethacrylic Acids; D019279:Resin Cements; C534572:eugenyl methacrylate; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; D017886:Durapatite; D015040:Zirconium; C028541:zirconium oxide
keywords: BISGMA/TEGDMA; Endodontic post restoration; Eugenol; Eugenyl methacrylate; Hydroxyapatite fillers; Resin composite core materials; Zirconia fillers