Title: |
Williamson–Hall based X-ray peak analysis of a magnesium doped nano-hydroxyapatite powder produced by a combined ultrasonic and microwave heating-based method
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Authors: |
Supriya Rattan, Derek Fawcett, Gerrard Eddy Jai Poinern |
Source: |
International Journal of Advanced Research in Dental and Medical Sciences (IJLRAVS), pp 01 - 08, Vol 01 - No. 01, 2022 |
Abstract: |
The present study used a combined ultrasonic and microwave heating-based method to produce pure and magnesium doped nano-hydroxyapatite powders. The powders were characterized using X-ray diffraction, Fourier transform infrared spectroscopy and field emission scanning electron microscopy. The Williamson-Hall (W-H) analysis techniques were used to study the effects of peak broadening in X-ray diffraction data. The analysis revealed magnesium ions were incorporated into the hydroxyapatite structure and changed the lattice parameters. The substitution of magnesium ions increased the (a) lattice parameter by (0.0689%) and slightly decreasing the (c) parameter by (0.2732%). The analysis also revealed magnesium substitution decreased the crystallite size, while properties like lattice strain, stress and anisotropic energy density were increased. Further, the presence of magnesium in the powders reduced their calcium content and acted as a growth inhibitor that that decreased crystallinity. |
Keywords: |
Hydroxyapatite, ionic substitution, ultrasonic synthesis, X-ray peak analysis. |
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Title: |
Vonlay; A paradigm shift in post endodontic restoration: A case report
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Authors: |
Dr. Hussain Mookhtiar, Dr. Vivek Hegde, Dr Srilatha Shanmugasundaram, Zahra Shakil Memon, Asiya Zaynab Malik |
Source: |
International Journal of Advanced Research in Dental and Medical Sciences (IJLRAVS), pp 09 - 13, Vol 01 - No. 01, 2022 |
Abstract: |
Porcelain veneers have long been a popular restorative option that have evolved into a well accepted treatment that can be fabricated in various ways. Onlays are another common treatment modality used in contemporary dentistry to restore large areas of decay and to replace old restorations. With the availability of newer high-strength materials such as lithium disilicate and processing technologies like CAD/CAM and heat pressing, dental professionals are now able to produce highly esthetic, high-strength restorations that blend seamlessly with the natural dentition while also withstanding posterior occlusal forces. A tooth more complex restoration is required after endodontic treatment when compared to normal tooth restoration, because of factors such as extensive caries, post-treatment root canal dentin and even the economics condition of the patient. One such design proposed by Dr. Ronald E Goldstein is ―Veenerlay‖or ―Vonlay‖. Vonlay is a blend of an onlay with an extended buccal veneer surface for use in premolar region, where there is sufficient enamel present to bond. This restorative option requires a much less invasive preparation than a full coverage crown but provides the same structural benefits. Thus, the aim of this case report is to present a case of Vonlay following endodontic treatement of lower mandibular premolar |
Keywords: |
Vonlay, Onlay, Veneer, Premolars, Post endodontic restoration |
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