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Mineralization of calcium phosphate in reverse microemulsion
Xiang-Dong Kong,Xiao-Dan Sun,Jun-Biao Lu,Fu-Zhai Cui 한국물리학회 2005 Current Applied Physics Vol.5 No.5
In the present study, reverse microemulsion was prepared to regulate the mineralization of calcium phosphate. Calcium chlorideand sodium hydrogen phosphate aqueous solution were, respectively, dropped into the mixture of Span 80, Tween 80, andn-heptaneto get two kinds of emulsions.n-Buranol was used to adjust the emulsions to transparent state. Calcium phosphate was prepared byadding phosphate microemulsion to Calcium microemulsion. Heating method was used to induce the phase separation. After beingwashed with acetone and ethanol, the mineralized deposition were studied with scanning electron microscopy (SEM), X-ray dirac-tion (XRD) and transmission electron microscopy (TEM). The results indicated that the minerals in the deposition were mainlymonetite (DCPA) and the nanosized needle-like DCPA exhibited the preferential orientation along 200 direction..
Zhao, Bao Hong,Feng, Hai Lan,Sun, Xiao Dan,Cui, Fu Zhai,Lee, In Seop Trans Tech Publications, Ltd. 2006 Key Engineering Materials Vol.309 No.-
<P>A part of the titanium dental implant surface, which will meet connective tissue after being inserted in mandibular bone, was coated with calcium phosphate by ion beam assisted deposition (IBAD). Twenty-four implants of coated and uncoated group were randomly placed in mandibles after 3 months of premolars extraction in beagle dogs. All the implants were firmly anchored in the bone and had no clinical signs of peri-implant inflammation after 3-month insertion. The probing depth in calcium phosphate coated group is 1.9±0.2 mm, less than in control group (2.1±0.2 mm) (p<0.05). Most of the probing sites tended to bleed upon probing in two groups. It might indicate that the calcium phosphate coating has the potential to promote soft tissue integration.</P>
Effect of pH on the fibroin regulated mineralization of calcium phosphate
Xiao-Dan Sun,Ying-Li Zhou,Juan-Yong Ren,Fu-Zhai Cui,Heng-De Li 한국물리학회 2007 Current Applied Physics Vol.7 No.s1
The eect of pH on the mineralization of calcium phosphate regulated by broin is investigated in this paper. Calcium phosphatesform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results dem-onstrated the great inuence of pH on the formation of calcium phosphate, both in the presence and in the absence of broin. Purehydroxyapatite (Ca10(PO4)6(OH)2,HA) can be obtained at relatively high pH (pH 8.0), while brushite (CaHPO4 Æ2H2O, DCPD) isto HA and regulate the morphology and structure of the HA crystals obtained.