Effect of bovine hydroxyapatite on early stages of bone formation

  • Bruno Salles Sotto-Maior FOP - Unicamp
  • Plinio Mendes Senna FOP - Unicamp
  • Beatriz Julião Vieira Aarestrup Juiz de Fora Dental School
  • Rosangela Almeida Ribeiro Juiz de Fora Dental School
  • Neuza Maria de Souza Picorelli Assis Juiz de Fora Dental School
  • Altair Antoninha Del Bel Cury FOP - Unicamp
Keywords: Bone regeneration, biocompatible materials, hydroxyapatite

Abstract

Purpose: This study aimed to characterize the effect of bovine hydroxyapatite particles (HA) on the early stages of bone repairing in a rat femur defect model. Methods: A non-critical 2 mm diameter bone defect was made in both femurs of 25 male albino Wistar rats. The left femurs defects were filled with HA and the right femurs defects were just let to fill with blood. Five animals were sacrificed at the 1st, 3rd, 5th, 7th or 14th post-surgery day and bone tissue sections were stained with hematoxylin and eosin for comparison of inflammatory response by light microscopy. Histomorphometrical analysis of the newly formed bone was evaluated at the three last periods, using independent t-student test to compare both groups at each period (α=0.05). Results: Histological analyses showed same standard of bone repair on first and third day; however, from the fifth post-surgery day there was a higher deposit of collagen fibers surrounding the hydroxyapatite particles and a greater thickness of the opposite side periosteum. There was no significant histomorphometrical difference between groups at all periods. Conclusion: It can be concluded that hydroxyapatite does not accelerate the early-stage of bone repairing, despite of induction of a higher deposit of collagen fibers.

Author Biographies

Bruno Salles Sotto-Maior, FOP - Unicamp
PhD Student, Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas, Campinas, São Paulo, Brazil.
Plinio Mendes Senna, FOP - Unicamp
PhD Student, Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas, Campinas, São Paulo, Brazil.
Beatriz Julião Vieira Aarestrup, Juiz de Fora Dental School
Professor. Juiz de Fora Dental School, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil.
Rosangela Almeida Ribeiro, Juiz de Fora Dental School
Professor. Juiz de Fora Dental School, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil.
Neuza Maria de Souza Picorelli Assis, Juiz de Fora Dental School
Professor. Juiz de Fora Dental School, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil.
Altair Antoninha Del Bel Cury, FOP - Unicamp
Professor, Department of Prosthodontics and Periodontology, Piracicaba Dental School, State University of Campinas, Campinas, São Paulo, Brazil.
Published
2011-08-28
Section
Original Article