title: Histological and histomorphometric analyses of calcium phosphate cement in rabbit calvaria.
abstract: OBJECTIVE
  To assess bone regeneration in critical sized defects in the rabbit calvarium, filled with the bone substitute calcium phosphate cement.
  
  
  METHODS
  Circular bone defects (8mm) were made in both parietal bones of 10 rabbits. One of the defects was filled with the calcium phosphate cement, and the other received autogenous bone harvested from the calvaria. The animals were killed at 3 or 6 weeks (n=5). Data analysis included qualitative assessment of the calvarial specimens and histomorphometric analysis was used to quantify the amount of new bone within the defects.
  
  
  RESULTS
  The microscopic analysis of the samples showed bone healing with both calcium phosphate cement and autogenous bone graft. Data obtained from the histomorphometric analysis were statistically analyzed using 2-way analysis of variance and the Tukey's test. Data analysis showed that the autogenous bone graft had significantly more new bone compared with calcium phosphate cement at 3 and 6 weeks. Calcium phosphate cement at 6 weeks presented similar results to autogenous bone at 3 weeks. Both treatments presented an increase in bone healing with time.
  
  
  CONCLUSIONS
  Treatments allowed bone regeneration that increased with time, however surgical cavities treated with the autogenous graft had more bone formation than those with calcium phosphate cement.
authors.affiliation: Division of Oral and Maxillofacial Surgery, Department of Oral Diagnosis, Piracicaba Dental School, Campinas State University, Avenue Limeira 901, Piracicaba, SP, Brazil.
authors.forename: Samantha Cristine Santos Xisto Braga
authors.initials: SC
authors.lastname: Cavalcanti
authors.forename: Cecília Luiz
authors.initials: CL
authors.lastname: Pereira
authors.forename: Renato
authors.initials: R
authors.lastname: Mazzonetto
authors.forename: Marcio
authors.initials: M
authors.lastname: de Moraes
authors.forename: Roger William Fernandes
authors.initials: RW
authors.lastname: Moreira
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D001843:Bone Cements; D001861:Bone Regeneration; D018786:Bone Substitutes; D016025:Bone Transplantation; D002130:Calcium Phosphates; D005260:Female; D006882:Hydroxyapatites; D010294:Parietal Bone / Q000601:surgery; D011817:Rabbits
chemical_list: D001843:Bone Cements; D018786:Bone Substitutes; D002130:Calcium Phosphates; D006882:Hydroxyapatites; C475044:hydroxyapatite cement