Formation of apatite-collagen complexes.
An apatite-collagen complex was prepared in calcium beta-glycerophosphate solutions at pH 9.0 and 37 degrees C with the purpose of developing new bone substitutes that more closely resemble bone than currently available materials. Reconstituted type I collagen as well as sheet collagen were crosslinked in the presence of alkaline phosphatase and egg-yolk phosvitin. The crosslinked collagens were immersed in daily-renewed calcium beta-glycerophosphate solutions for 2 and 4 weeks to induce the deposition of apatite on the collagen fibers. After 2 weeks of reaction, for example, apatites deposited approximately two times the crosslinked collagen in weight. With reconstituted collagen, the complex showed some elasticity but no apatite was visually observed to detach under deformation with fingers and forceps. The complex, moreover, did not disintegrate when immersed in saline or animal blood. Nevertheless, the complex resorbed with no evidence of cytotoxicity when implanted in muscle tissues. These findings suggest that the apatite-collagen complex prepared would be useful as bone substitutes, especially for periodontal osseous lesion repair and alveolar ridge augmentation.
Doi
Y
Y
Department of Dental Materials and Technology, School of Dentistry, Asahi University, Gifu, Japan.
Horiguchi
T
T
Moriwaki
Y
Y
Kitago
H
H
Kajimoto
T
T
Iwayama
Y
Y
D000469:Alkaline Phosphatase; D000818:Animals; D001031:Apatites; D001672:Biocompatible Materials; D001842:Bone and Bones; D002417:Cattle; D003094:Collagen / Q000648:ultrastructure; D003432:Cross-Linking Reagents; D005994:Glycerophosphates; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D010710:Phosphates / Q000032:analysis; D010774:Phosvitin; D019736:Prostheses and Implants; D051381:Rats; D017208:Rats, Wistar; D012996:Solutions; D014961:X-Ray Diffraction
D001031:Apatites; D001672:Biocompatible Materials; D003432:Cross-Linking Reagents; D005994:Glycerophosphates; D010710:Phosphates; D012996:Solutions; D003094:Collagen; D010774:Phosvitin; D000469:Alkaline Phosphatase; C031463:beta-glycerophosphoric acid