RESUMEN
Objective:To study the effects of osteoid hydroxyapatite(OHA)in repair of bone defect.Methods:Bone defect in the size of 9 mm?5 mm?4 mm was made in bilateral thigh-bone entocondyle in 12 rabbits,OHA was implanted in the defects on one side and hydroxyapatite(HA)on another side.2,4,8 and 12 weeks after operation 4 rabbits were killed respectively,bone samples with the implants were prepared and examined by roentgenography,histology and SEM.New bone formation was determined by measuring the area of new bone in the samples.Results:Gross imspection and roentgenography observation showed that the defects were repaired in both groups 12 weeks after operation.Histological examination showed that new bone was increasing,absorption and disintegration of the implants were progressing from 2 to 12 weeks after operation.4,8 and 12 weeks after operation larger new bone area was found in OHA implanted defects than that in HA implanted(P