RESUMO
Statement of Problem: in order to increase the performance of glass ionomer cement, it is reinforced with metal powders, short fibers, bioceramics and other materials. Fluoroapatite [Ca[10][PO[4]][6]F[2]] is found in dental enamel and is usually used in dental materials due to its good chemical and physical properties
Objectives: in this study, the effects of the addition of synthesized fluoroapatite nanoceramic on the compressive strength and bioactivity of glass ionomer cement were investigated
Materials and Methods: the synthesized fluoroapatite nanoceramic particles [ 70 nm] were incorporated into as-prepared glass ionomer powder and were characterized using X-ray diffraction [XRD], Fourier transform infrared spectroscopy [FTIR] and scanning electron microscopy [SEM]. Moreover, the compressive strength values of the modified glass ionomer cements with 0, 1, 3 and 5 wt% of fluoroapatite were evaluated
Results: results showed that glass ionomer cement containing 3 wt% fluoroapatite nanoparticles exhibited the highest compressive strength [102.6 +/- 4] compared to the other groups, including control group. Furthermore, FTIR and SEM investigations indicated that after soaking the glass ionomer cement- 3 wt% fluoroapatite composite in the simulated body fluid solution, the intensity of O-H, P-O and C-O absorption bands increased as a result of the formation of apatite layer on the surface of the sample, and the rather flat and homogeneous surface of the cement became more porous and inhomogeneous
Conclusions: addition of synthesized nano-fluoroapatite to as-prepared glass ionomer cement enhanced the compressive strength as well as nucleation of the calcium phosphate layer on the surface of the composite. This makes it a good candidate for dentistry and orthopedic applications
RESUMO
Osseous defects around dental implants are often seen when implants are placed in areas with inadequate alveolar bone, or around failing implants. Bone regeneration in these areas using bone grafts or its substitutes may improve dental implants prognosis. The aim of this study was to prepare and characterize the bioactive glass nanopowder and development of its coating for treatment of oral bone defects. Bioactive bioglass coating was made on stainless steel plates by sol-gel technique. The powder shape and size was evaluated by transmission electron micropscopy, and thermal properties studied using differential thermal analysis [DTA]. Structural characterization techniques [XRD] were used to analyze and study the structure and phase present in the prepared bioactive glass nanopowder. This nanopowder was immersed in the simulated body fluid [SBF] solution. Fourier transform infrared spectroscopy [FTIR] was utilized to recognize and confirm the formation of apatite layer on prepared bioactive glass nanopowder. The bioglass powder size was less than 100 nanometers which was necessary for better bioactivity, and preparing a homogeneous coating. The formation of apatite layer confirmed the bioactivity of the bioglass nanopowder. Crack-free and homogeneous bioglass coatings were achieved with no observable defects. It was concluded that the prepared bioactive glass nanopowder could be more effective as a bone replacement material than conventional bioactive glass to promote bone formation in osseous defects. The prepared bioactive glass nanopowder could be more useful for treatment of oral bone defects compare to conventional hydroxyapatite or bioactive glass