title: [The efficacy of collagen-hydroxyapatite composite membrane on bone regeneration].
abstract: OBJECTIVE
  To investigate the efficacy of a new collagen-hydroxyapatite (COL-HA) composite membrane on bone regeneration of SD rat cranial defects.
  
  
  METHODS
  Four defects were produced in the calvaria of 24 SD rats. The animals were divided into four groups: Empty defects without membrane (group 1); defects covered by COL-HA single-layer dense membranes (group 2); defects covered by COL-HA double-layer membranes (group 3); defects covered by Bio-Gide membranes (group 4). At 2, 4, 8 and 12 weeks after surgery, 6 rats were sacrificed and the following parameters were analyzed: Macroscopic observation, X-ray examination, descriptive histology, regenerate bone quantitative histology. Statistical analysis consisted of generalized linear models/factorial design analysis of variance and LSD-t test was performed.
  
  
  RESULTS
  Since two weeks after surgery, there were a small amount of bone regenerated in three groups except group 1. At 12 weeks after surgery, the opaque sclerous tissues filled with the defects in three groups, and residual membrane fragments still could be found. X-ray pictures showed the density of regenerate bone in group 3 and group 4 was closed to the original bone and greater than that of group 2. Quantitative analysis of regenerate bone showed that in initial stage, group 4 had more bone regeneration than the other groups (P < 0.05), and at 12 weeks after surgery the differences between group 4 and group 2/group 3 had no statistically significant.
  
  
  CONCLUSIONS
  The COL-HA composite membranes can guide bone regeneration of rat cranial defects. The efficacy of bone regeneration of COL-HA double-layer membrane is superior to COL-HA single-layer dense membrane, because its property is more propitious to the adherence and proliferation of osteoblasts.
authors.affiliation: Dept. of Prosthodontics, Hospital of Stomatology, Wenzhou Medical College, Wenzhou 325027, China.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Jin
authors.forename: Xiao-min
authors.initials: XM
authors.lastname: Wang
authors.forename: Xiao-fei
authors.initials: XF
authors.lastname: Wang
authors.forename: Xu-dong
authors.initials: XD
authors.lastname: Li
authors.forename: Jian-feng
authors.initials: JF
authors.lastname: Ma
mesh_terms: D000818:Animals; D001861:Bone Regeneration; D001842:Bone and Bones; D003094:Collagen; D017886:Durapatite; D010006:Osteoblasts; D051381:Rats; D017207:Rats, Sprague-Dawley; D012886:Skull
chemical_list: C106416:Bio-Gide; D003094:Collagen; D017886:Durapatite