Abstracts Book - IMRC 2018

• SE2-O033
SYNTHESIS OF A DIOPSIDE-TRICALCIUM PHOSPHATE
BIOCERAMIC BY THE PETRURGIC METHOD, AND EVALUATION OF
ITS IN VITRO BIOACTIVITY
Jorge López Cuevas 1 , Claudia Magdalena López Badillo 2 , Juan Méndez Nonell 3 , José Luis
Rodríguez Galicia 1
1 Centro de Investigación y de Estudios Avanzados del IPN - CINVESTAV, Ceramics Engineering,
Mexico. 2 Universidad Autónoma de Coahuila, Facultad de Ciencias Químicas, Mexico. 3 Centro
de Investigación en Materiales Avanzados, S.C., , Mexico.
The development of glass-ceramics in the system MgO-CaO-SiO 2 -P 2 O 5 has
potential importance for the fabrication of implants, since they exhibit sufficient
biocompatibility and mechanical strength, and are also able to form tight
chemical bonds with human bone. In the present work, a biomaterial based on
the eutectic composition of the Diopside (CaO·MgO·2SiO 2 )-Tricalcium
Phosphate (3CaO·P 2 O 5 ) binary system, with composition 39 wt.% Tricalcium
Phosphate and 61 wt.% Diopside, was synthesized by the so-called “petrurgic
method”. In this method, a liquid glass is obtained, and then this is subsequently
devitrified (crystallized) in a single melting and cooling cycle inside the melting
crucible, in which a primary crystallization of the melt takes place; i.e., nucleation
and growth of crystalline phases occur during cooling down of the molten
material. The cooling rate, holding time and treatment temperature were varied.
All materials were soaked in a simulated body fluid (SBF) 7 to 21 days and
characterized, before and after soaking in the SBF, by X-ray diffraction (XRD),
scanning electron microscopy (SEM), Vickers microhardness and chemical
analysis by ICP. As expected, the synthesized materials showed an eutectic
microstructure constituted by alternated Diopside and Tricalcium Phosphate
irregular lamellas. The materials showed a high reactivity in the SBF, resulting in
the dissolution of diopside. This led to the formation of a porous structure in the
material that mimics a porous bone. Then, the cavities left by the dissolved
diopside were filled up by a hidroxiapatite-like material [Ca 10 (PO 4 ) 6 (OH) 2 ]; this
point onwards, this phase will be denominated simply as “apatite”. Tricalcium
Phosphate located near the sample surface was also simultaneously
transformed into an apatite phase. The net result of the occurrence of these
processes was the formation of an apatite surface layer in the samples. These
results indicate that our material has potentially good osseointegration
properties, because it was possible to obtain in it diopside-associated cavities