As a senior lecturer in Physics and Astronomy at the University of Kent, I am involved in a variety of academic activities such as teaching, research, and academic services. Specifically, I am a member of the Applied Optics Group, where I am actively engaged in developing novel imaging techniques for applications in the fields of biosciences and medicine. My research is focused on three main areas:
1. Optical Coherence Tomography: This is a non-invasive imaging technique that uses light to generate detailed images of biological tissues. Through my research, I aim to develop advanced imaging techniques that can provide high-resolution images of biological tissues with improved depth penetration and image contrast.
2. Elastography: This is a technique that measures the mechanical properties of tissues by applying mechanical stress and measuring the resulting deformation. I am working on developing advanced elastography techniques that can provide quantitative measurements of tissue stiffness, which can be used for the diagnosis of various diseases.
3. Photoacoustics: This is a technique that combines optical and acoustic imaging to generate high-resolution images of tissues. Through my research, I aim to develop advanced photoacoustic techniques that can provide images with improved spatial resolution and contrast.
1. Optical Coherence Tomography: This is a non-invasive imaging technique that uses light to generate detailed images of biological tissues. Through my research, I aim to develop advanced imaging techniques that can provide high-resolution images of biological tissues with improved depth penetration and image contrast.
2. Elastography: This is a technique that measures the mechanical properties of tissues by applying mechanical stress and measuring the resulting deformation. I am working on developing advanced elastography techniques that can provide quantitative measurements of tissue stiffness, which can be used for the diagnosis of various diseases.
3. Photoacoustics: This is a technique that combines optical and acoustic imaging to generate high-resolution images of tissues. Through my research, I aim to develop advanced photoacoustic techniques that can provide images with improved spatial resolution and contrast.
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MATERIALS AND METHODS: 25 preparations of frontal and lateral teeth were performed for 7 different patients. The impressions of the prosthetic fields were obtained both using a conventional optoelectronic system (Apolo Di, Syrona) and a Spectral Domain using OCT (Dental prototype, working at 860 nm). For the conventional impression technique the preparation margins were been prelevated by gingival impregnated cords. No specific treatments were performed by the OCT impression technique.
RESULTS: The scanning performed by conventional optoelectronic system proved to be quick and accurate in terms of impression technology. The results were represented by 3D virtual models obtained after the scanning procedure was completed. In order to obtain a good optical impression a gingival retraction cord was inserted between the prepared tooth and the gingival tissue for a better elevation of the tooth cervical margin preparation. Spectral OCT was enforced in order to observe the quality but also the advantages coming from this technology. No special preparation was performed for this operation.
CONCLUSION: Considering these aspects, OCT could be used as a valuable tool for dental impression technology, being non-invasive but also non-destructive on the marginal gingival tissue, in comparison with conventional optoelectronic technology where the gingival retraction cord is still mandatory.
Materials and methods. 24 all ceramic FPPs created with CAD/CAM technology were used. The models were scanned with Zeno Wieland Scanner, a one touch scanning machine which requires between 45-60 s for a full model scan. The scanner provides 3 axis-architecture and automatic data processing. The zirconia infrastructures resulted from milling zirconia green disks in Wieland units, followed by the deposition of ceramic masses and then by burning procedures. All the samples were assessed with a Time Domain Optical Coherence Tomography (TD-OCT) system working at a wavelenght of 1300 nm. Using OCT investigations, material defects were detected in the areas of maximal tension, i.e. the connectors, the oclusal, and the cervical areas. These samples with defects in the above areas have not been considered for the study further on. Finally, the samples were loaded in a MultiTest 5 i Mecmesin system and tested until fracture occurred. The MultiTest 5-i creates tensile and compression forces of up to 5 kN.
Results and discussions. All the test samples survived a dynamic load of 1.2 x 107 cycles and a thermal cycle mixer simulator version; signs of failure in terms of fracture lines were observed in all samples. The average value of the force necessary to break the FPPs obtained from the tests is 1750 N.
Conclusions. Conventional metal-ceramic fixed partial dentures are still considered the standard for edentulous spaces in the posterior region. Therefore, the resistance of metal-ceramic fixed partial dentures has served in this study as a guide for new ceramics tests. All the values from this study conducted in FPP with zirconia frames were much lower than the values reported for metal ceramic fixed partial dentures (i.e., 2500-3000 N), but higher that 1000 N, which is considered the lowest resistance point to be utilized in the rear region of the oral cavity.
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