title: Tri-calcium phosphate (ß-TCP) can be artificially synthesized by recycling dihydrate gypsum hardened.
abstract: Calcium phosphate is known as a major component of biological hard tissues. This study aimed to produce calcium phosphate by recycling kneaded surplus gypsum. β-dihydrate gypsum was derived from commercial dental β-hemihydrate gypsum, which was mechanically powdered and mixed with the liquid component of a commercial zinc phosphate cement. This mixture was fired at 1,200°C and evaluated by XRD analysis, thermal analysis and scanning electron microscopy (SEM). An acceptable ratio of mixing was 4 g of β-dihydrate gypsum powder to 1.5 mL of phosphoric acid liquid. XRD peaks were monotonic below 800°C, but new ß-TCP was formed by firing at 900°C or more, although TG-DTA analysis of synthetic ß-TCP suggested that some residual dihydrate gypsum remained in the sample. SEM images indicated a fused-block bone-like structure covered with phosphorus and calcium. These results suggest that production of synthetic β-TCP is possible through ecological techniques using recycled materials.
authors.affiliation: Department of Conservative Dentistry, Division of Biomaterials and Engineering, Showa University School of Dentistry.
authors.forename: Cho
authors.initials: C
authors.lastname: Han-Cheol
authors.forename: Masaharu
authors.initials: M
authors.lastname: Hori
authors.forename: Takakazu
authors.initials: T
authors.lastname: Yoshida
authors.forename: Naoko
authors.initials: N
authors.lastname: Yamada
authors.forename: Yuko
authors.initials: Y
authors.lastname: Komada
authors.forename: Yukimichi
authors.initials: Y
authors.lastname: Tamaki
authors.forename: Takashi
authors.initials: T
authors.lastname: Miyazaki
mesh_terms: D018786:Bone Substitutes / Q000737:chemistry*; D002130:Calcium Phosphates / Q000138:chemical synthesis*; D002133:Calcium Sulfate / Q000737:chemistry*; D006244:Hardness; D006358:Hot Temperature; D008855:Microscopy, Electron, Scanning; D010756:Phosphoric Acids; D011208:Powders; D014961:X-Ray Diffraction; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D018786:Bone Substitutes; D002130:Calcium Phosphates; D010756:Phosphoric Acids; D011208:Powders; C485817:beta-tricalcium phosphate; D015036:Zinc Phosphate Cement; C030242:phosphoric acid; D002133:Calcium Sulfate