title: Evaluation of a novel biphasic calcium phosphate in standardized bone defects: a histologic and histomorphometric study in the mandibles of minipigs.
abstract: OBJECTIVE
  A novel biphasic calcium phosphate (CaP) granulate consisting of hydroxyapatite (HA) and beta-tricalciumphosphate (TCP) was compared with pure HA and pure TCP and with autograft as positive control.
  
  
  METHODS
  Four standardized bone defects were prepared in both mandibular angles of 16 minipigs and grafted with autogenous bone chips, HA, HA/TCP (60% : 40%), or TCP. Histologic and histomorphometric analysis of bone formation and graft degradation followed healing periods of 2, 4, 8, and 24 weeks.
  
  
  RESULTS
  2 weeks: more bone formation in defects filled with autograft than with the three CaP materials (P<0.05). 4 weeks: bone formation differed significantly (P<0.05) between all four materials (autograft>TCP>HA/TCP>HA). 8 weeks: more bone formation in defects with autograft and TCP than with HA/TCP (P<0.05), and HA/TCP had more bone formation than HA (P<0.05). 24 weeks: no difference in bone formation between the groups. Autograft and TCP resorbed quickly and almost completely over 8 weeks, whereas HA/TCP and HA showed limited degradation over 24 weeks.
  
  
  CONCLUSIONS
  All defects healed with mature lamellar bone and intimate contact between bone and the remaining graft material. The rate of bone formation corresponded to the content of TCP in the CaP materials.
authors: Department of Oral Surgery and Stomatology, School of Dental Medicine, University of Berne, Berne, Switzerland. simon.storgaard@jensen.mail.dk
authors: Simon Storgård
authors: SS
authors: Jensen
authors: Alvin
authors: A
authors: Yeo
authors: Michel
authors: M
authors: Dard
authors: Ernst
authors: E
authors: Hunziker
authors: Robert
authors: R
authors: Schenk
authors: Daniel
authors: D
authors: Buser
mesh_terms: D000818:Animals; D001672:Biocompatible Materials / Q000008:administration & dosage / Q000737:chemistry / Q000627:therapeutic use*; D018786:Bone Substitutes / Q000008:administration & dosage / Q000627:therapeutic use*; D016025:Bone Transplantation / Q000379:methods*; D002130:Calcium Phosphates / Q000008:administration & dosage / Q000737:chemistry / Q000627:therapeutic use*; D004338:Drug Combinations; D017886:Durapatite / Q000008:administration & dosage / Q000737:chemistry / Q000627:therapeutic use*; D005500:Follow-Up Studies; D008334:Mandible / Q000187:drug effects / Q000601:surgery*; D016348:Osseointegration / Q000187:drug effects; D010012:Osteogenesis / Q000187:drug effects; D013552:Swine; D013556:Swine, Miniature
chemical_list: D001672:Biocompatible Materials; D018786:Bone Substitutes; D002130:Calcium Phosphates; D004338:Drug Combinations; C485817:beta-tricalcium phosphate; D017886:Durapatite