Abstract: There are disclosed a porous composite comprising silicon-substituted hydroxyapatite and ?-tricalcium phosphate (?-TCP), and a method for preparing the same. The porous composite is prepared by subjecting natural coral to hydrothermal and solvothermal reactions to prepare silicon-substituted hydroxyapatite (Si—HA) and subjecting the Si—HA to a heat treatment process. Thereafter, Si—HA and ?-TCP may be mixed in the porous composite. As a result, the porous composite is excellent in biocompatibility and biodegradability. Also, the porous composite functions to maintain the microstructure of coral and is similar to natural bone in terms of composition and shape. Accordingly, the porous composite may be effectively used as a bone tissue repairing material and a bone graft material that can substitute for human hard tissue.

Abstract: There are disclosed a porous composite comprising silicon-substituted hydroxyapatite and ?-tricalcium phosphate (?-TCP), and a method for preparing the same. The porous composite is prepared by subjecting natural coral to hydrothermal and solvothermal reactions to prepare silicon-substituted hydroxyapatite (Si-HA) and subjecting the Si-HA to a heat treatment process. Thereafter, Si-HA and ?-TCP may be mixed in the porous composite. As a result, the porous composite is excellent in biocompatibility and biodegradability. Also, the porous composite functions to maintain the microstructure of coral and is similar to natural bone in terms of composition and shape. Accordingly, the porous composite may be effectively used as a bone tissue repairing material and a bone graft material that can substitute for human hard tissue.

Abstract: A cordless complex root canal plugger for dental clinics is disclosed. The root canal plugger includes a battery charger; a pen-type vertical spreader having a rechargeable battery unit and a control unit therein; and a gun-type injection device having both a rechargeable battery unit and a control unit therein. The battery charger, the pen-type vertical spreader and the gun-type injection device are provided as a group of complementary products. The cordless complex root canal plugger allows an endodontist to move freely in a dental clinic while executing a root canal plugging procedure using the cordless complex root canal plugger during nerve treatment. Thus, the endodontist can more easily, rapidly and precisely pack a root canal with a filler material and, therefore, the cordless complex root canal plugger induces en-dodontists to buy it.