Abstract
Bioglasses in the system 24.5Na2O.24.5CaO.6P2O5.xCrF2.(45-x)SiO2 have been studied in the composition region of x= 0-10 mol%. CrF2. Glass of molar ratio (Ca+Na)/SiO2 ~1.1 is the base material for the glasses containing different CrF2 concentrations. X-ray diffraction (XRD), differential scanning calorimetriy (DSC), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and Vicher hardness (Hv) measurements have been carried out. Crystalline feature of the glasses is followed up by XRD spectroscopy. It is found that crystallinity was enhanced via CrF2 addition. More enhancement was confirmed via thermal heat treatment process. Increasing CrF2 and sintering temperature will induce new ordered phases which will be distributed in the main glassy phase. Well formed flouroapatite (Ca5(PO4)3F and wollastonite Ca3Cr2(SiO4)3 phases containing fluorine and chromium ions are evidenced in CrF2 containing glasses. Increasing glass transition temperature Tg and hardness number Hv upon increasing CrF2 concentration was discussed on bases of formation of additional bonds by the effect of CrF2 molecules. The measured temperature window between Tc and Tg was found to have a great influence in material structure. Wide window is a feature of amorphous glass which free from CrF2. The window scale is found to quickly decrease with increasing CrF2, since crystalline phases are already formed in glasses containing CrF2. Formation of crystalline intermediate phases with more shielded silicate and phosphate structural is considered as the main reason for increasing Tg and (Hv) of the glasses. EDS as well as XRD analyzed spectra confirm that crystalline wollastonite of calcium inosilicate mineral (CaSiO3) phase is well formed. The wollastonite species is evidenced to contain small amounts of chromium and fluorine ions which are substituting for calcium cations. Wollastonite phases with Cr/Si=1 is the most dominant type. This ratio is a characteristic feature of crystalline CaSiO3 species. Small concentration from fluorine ions are involved in apatite phases. Presence of both crystalline apatite and wollastonite in the sample matrix promotes its biocompatibility, particularly orthopedic bioactivity. As a consequence, some of investigated glasses are recommended to be applicable in dental field of applications. This depends on its own crystallinity, hardness, its apatite and wollastonite concentration as biocompatible phases in the crystallized glass
Highlights
Some specific types of oxide glasses and glass ceramics can provide an appropriate biological response and result in the formation of a bond with the living tissues[1-5]
The base glass has already contained a high enough concentration of nuclei which are ready to aggregate to form crystalline phases by the help of dopant additive and /or sintering process
Bioglasses and glass ceramics containing different CrF2 concentrations have been studied by different structural techniques
Summary
Some specific types of oxide glasses and glass ceramics can provide an appropriate biological response and result in the formation of a bond with the living tissues[1-5]. New modified dental materials are a derivative from bioactive glass ceramics which have different structures and properties when they compared with conventional glasses. Calcium phosphosilicate based material is well-known type which has bioactive and bio dental features are concerned in making bonds with natural tissues [4-7]. Bioactive materials are known to have a wide range of medical and dental applications. The bioactive glasses are modified to contain fluoride ions, since it prevents demineralization and enhances reminerization processes [10]. It has good activity in prevention secandary caries. The investigated glasses contain CaO and CrF2 in the composition with an aim that CrF2 can effectively enhance the structure and bioactivity of the investigated material. ISSN 2347-3487 Volume 13 Number 5 Journal of Advances in Physics chromium fluoride -substituted bioactive glasses and their crystallized structure were analyzed using XRD, DSC, EDS and SEM techniques
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
