title: Examination of Calcium Silicate Cements with Low-Viscosity Methyl Cellulose or Hydroxypropyl Cellulose Additive.
abstract: The purpose of this study was to improve the operability of calcium silicate cements (CSCs) such as mineral trioxide aggregate (MTA) cement. The flow, working time, and setting time of CSCs with different compositions containing low-viscosity methyl cellulose (MC) or hydroxypropyl cellulose (HPC) additive were examined according to ISO 6876-2012; calcium ion release analysis was also conducted. MTA and low-heat Portland cement (LPC) including 20% fine particle zirconium oxide (ZO group), LPC including zirconium oxide and 2 wt% low-viscosity MC (MC group), and HPC (HPC group) were tested. MC and HPC groups exhibited significantly higher flow values and setting times than other groups (p< 0.05). Additionally, flow values of these groups were higher than the ISO 6876-2012 reference values; furthermore, working times were over 10 min. Calcium ion release was retarded with ZO, MC, and HPC groups compared with MTA. The concentration of calcium ions was decreased by the addition of the MC or HPC group compared with the ZO group. When low-viscosity MC or HPC was added, the composition of CSCs changed, thus fulfilling the requirements for use as root canal sealer. Calcium ion release by CSCs was affected by changing the CSC composition via the addition of MC or HPC.
authors.affiliation: Department of Endodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan.
authors.forename: Toshiaki
authors.identifier: 0000-0002-9738-1692
authors.initials: T
authors.lastname: Baba
authors.affiliation: Department of Endodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan; Research Institute of Oral Science, Nihon University School of Dentistry at Matsudo, Chiba, Japan.
authors.forename: Yasuhisa
authors.initials: Y
authors.lastname: Tsujimoto
mesh_terms: D017607:Aluminum Compounds; D002118:Calcium / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry* / Q000627:therapeutic use; D002482:Cellulose / Q000031:analogs & derivatives* / Q000737:chemistry / Q000627:therapeutic use; D003738:Dental Cements / Q000737:chemistry* / Q000627:therapeutic use; D003786:Dental Pulp Cavity / Q000473:pathology / Q000601:surgery; D004338:Drug Combinations; D006801:Humans; D008747:Methylcellulose / Q000737:chemistry / Q000627:therapeutic use; D010087:Oxides; D012387:Root Canal Filling Materials / Q000737:chemistry* / Q000627:therapeutic use; D017640:Silicates / Q000737:chemistry* / Q000627:therapeutic use; D014783:Viscosity; D015040:Zirconium / Q000737:chemistry / Q000627:therapeutic use
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D003738:Dental Cements; D004338:Drug Combinations; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate; D002482:Cellulose; D008747:Methylcellulose; C008079:hydroxypropylcellulose; D015040:Zirconium; C028541:zirconium oxide; C031293:calcium silicate; D002118:Calcium