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Atsuhito Kakuta,Takaaki Tanaka,Masaaki Chazono,Hirokazu Komaki,Seiichiro Kitasato,Naoya Inagaki,Shoshi Akiyama,Keishi Marumo 한국생체재료학회 2019 생체재료학회지 Vol.23 No.3
Background: It has been reported that the microporous structure of calcium phosphate (CaP) ceramics is important to osteoconduction. Bone morphogenetic protein-2 (BMP-2) has been shown to be a promising alternative to bone grafting and a therapeutic agent promoting bone regeneration when delivered locally. The aim of this study was to evaluate the effects of micro-porosity within beta-tricalcium phosphate (β-TCP) cylinders and local BMP-2 administration on β-TCP resorption and new bone formation. Methods: Bilateral cylindrical bone defects were created in rabbit distal femora, and the defects were filled with β-TCP. Rabbits were divided into 3 groups; defects were filled with a β-TCP cylinder with a total of approximately 60% porosity (Group A: 13.4% micro- and 46.9% macropore, Group B: 38.5% micro- and 20.3% macropore, Group C: the same micro- and macro-porosity as in group B supplemented with BMP-2). Rabbits were sacrificed 4, 8, 12, and 24 weeks postoperatively. Results: The number of TRAP-positive cells and new bone formation in group B were significantly greater than those in group A at every period. The amount of residual β-TCP in group C was less than that in group B at all time periods, resulting in significantly more new bone formation in group C at 8 and 12 weeks. The number of TRAPpositive cells in group C was maximum at 4 weeks. Conclusions: These results suggest that the amount of submicron microporous structure and local BMP-2 administration accelerated both osteoclastic resorption of β-TCP and new bone formation, probably through a coupling-like phenomenon between resorption and new bone formation.
Quasifree Neutron Knockout from Ca54 Corroborates Arising N=34 Neutron Magic Number
Chen, S.,Lee, J.,Doornenbal, P.,Obertelli, A.,Barbieri, C.,Chazono, Y.,Navrá,til, P.,Ogata, K.,Otsuka, T.,Raimondi, F.,Somà,, V.,Utsuno, Y.,Yoshida, K.,Baba, H.,Browne, F.,Calvet, D.,Ch&ac American Physical Society 2019 Physical Review Letters Vol.123 No.14