title: [Experimental study of the bioresorbable collagen membrane used for guided bone regeneration around dental implants].
abstract: OBJECTIVE
  To investigate the effects of using guided bone regeneration (GBR) technique with an bioresorbable collagen membrane for repairing bone defects around dental implants.
  
  
  METHODS
  In 12 mongrel dogs, pure titanium implants were immediately implanted in mandibles after extraction of the mandibular third and fourth premolars of both sides, in which standard bone defects of 3 mm x 3 mm x 5 mm were created at mesial side of the implants. The defects on right side were covered with Co membrane, the left side was uncovered as control. The dogs were sacrificed 1, 2, 4, 6 months postoperatively. The specimens were removed and studied by gross observation, X-ray radiograph, histological examination, scanning electron microscope (SEM) and pull-out test.
  
  
  RESULTS
  The quantity and quality of new bone formation in experimental side which bone defects covered with Co membrane were much better than that in the control side.
  
  
  CONCLUSIONS
  With the biodegradable property and excellent biocompatibility, Co membrane can be used for guided bone regeneration to promote the bone repair progress, and the promotion acts mainly at early stage of bone healing.
authors.affiliation: Dept. of Oral and Maxillofacial Surgery, Sichuan Provincial People's Hospital, Chengdu, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Fei
authors.forename: Xiao-min
authors.initials: XM
authors.lastname: Yang
authors.forename: Zheng
authors.initials: Z
authors.lastname: Li
authors.forename: Ming-ping
authors.initials: MP
authors.lastname: Yin
authors.forename: Zhi-hao
authors.initials: ZH
authors.lastname: Shen
authors.forename: Chu-hang
authors.initials: CH
authors.lastname: Liao
mesh_terms: D000818:Animals; D001861:Bone Regeneration; D003094:Collagen; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D004285:Dogs; D016557:Guided Tissue Regeneration, Periodontal; D008334:Mandible; D008567:Membranes, Artificial; D014025:Titanium
chemical_list: D015921:Dental Implants; D008567:Membranes, Artificial; D003094:Collagen; D014025:Titanium