title: Effects of added sodium alginate on mechanical strength of apatite cement.
abstract: Effects of added sodium alginate on the mechanical strength of Biopex, one type of apatite cement, were investigated since sodium alginate addition is very effective for Biopex to acquire anti-washout property. Addition of sodium alginate into the liquid phase of Biopex resulted in a slower transformation to apatitic monolith. As a result, mechanical strength of set Biopex in terms of diametral tensile strength (DTS) decreased when it was hardened in an incubator kept at 37 degrees C and 100% relative humidity for 7 days. However, DTS value increased with increase in the amount of added sodium alginate when the Biopex paste was immersed in 0.9% saline at 37 degrees C for 7 days. Set Biopex with less sodium alginate also showed larger porosity. Based on these findings, we concluded that added sodium alginate was effective in increasing the mechanical strength of Biopex by inhibiting liquid penetration into its paste when it is exposed to body fluids.
authors.affiliation: Japan Institute for Advanced Dentistry, Tokyo, Japan.
authors.forename: Shinya
authors.initials: S
authors.lastname: Tajima
authors.forename: Norihiko
authors.initials: N
authors.lastname: Nishimoto
authors.forename: Yuji
authors.initials: Y
authors.lastname: Kishi
authors.forename: Shigeki
authors.initials: S
authors.lastname: Matsuya
authors.forename: Kunio
authors.initials: K
authors.lastname: Ishikawa
mesh_terms: D000464:Alginates; D000704:Analysis of Variance; D002130:Calcium Phosphates / Q000737:chemistry*; D002809:Chondroitin Sulfates / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003738:Dental Cements / Q000737:chemistry*; D003799:Dental Stress Analysis; D020723:Glucuronic Acid; D006603:Hexuronic Acids; D006882:Hydroxyapatites / Q000737:chemistry*; D008422:Materials Testing; D016062:Porosity; D013386:Succinates / Q000737:chemistry*; D013718:Tensile Strength; D017155:Wettability
chemical_list: D000464:Alginates; C481019:Biopex; D002130:Calcium Phosphates; D003738:Dental Cements; D006603:Hexuronic Acids; D006882:Hydroxyapatites; D013386:Succinates; D020723:Glucuronic Acid; D002809:Chondroitin Sulfates