Physico-chemical-mechanical and in vitro biological properties of calcium phosphate cements with doped amorphous calcium phosphates

Biomaterials. 2007 Feb;28(6):956-65. doi: 10.1016/j.biomaterials.2006.10.018. Epub 2006 Nov 22.

Abstract

Calcium phosphate cements (CPCs) are successfully used as bone substitutes in dentistry and orthopaedic applications. This study investigated the physico-chemical-mechanical properties of and in vitro biological properties (cell response) of CPCs prepared with amorphous calcium carbonate phosphate (ACCP) doped with magnesium (ACCP-Mg), zinc (ACCp-Zn) or fluoride (ACCP-F) ions. The experimental CPC consisted of alpha-TCP, doped ACCP, and MPCM powders as matrix and biphasic calcium phosphate (BCP) granules. X-ray diffraction analysis showed that the matrix converted to apatite with poor crystallinity (reflecting small crystal size) after setting for 24 h, while BCP remained apparently unchanged. Cements with ACCP-F (F-CPC) had shorter setting times and greater compressive strength compared to cements with ACCP-Mg (Mg-CPC) or ACCP-Zn (Zn-CPC). Scanning electron microscopy (SEM) showed that crystals set on Mg-CPC and Zn-CPC were smaller compared to those on F-CPC. The total porosity of Mg-CPC was greater compared to Zn-CPC or F-CPC. Osteoblast-like cells, MC3T3-E1, remained viable and maintained their ability to express alkaline phosphatase in contact with the CPCs with doped ACCPs.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 3T3 Cells
  • Animals
  • Bone Cements / chemistry*
  • Bone Cements / pharmacology*
  • Calcium Phosphates / administration & dosage*
  • Calcium Phosphates / chemistry*
  • Cell Size / drug effects
  • Cell Survival / drug effects
  • Hardness
  • Materials Testing
  • Mice
  • Molecular Conformation
  • Osteoblasts / cytology
  • Osteoblasts / drug effects*
  • Osteoblasts / physiology
  • Particle Size
  • Porosity
  • Surface Properties

Substances

  • Bone Cements
  • Calcium Phosphates
  • calcium phosphate