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An Introduction to Bioactivity via Restorative Dental Materials
Published in Mary Anne S. Melo, Designing Bioactive Polymeric Materials for Restorative Dentistry, 2020
Mary Anne S. Melo, Ashley Reid, Abdulrahman A. Balhaddad
A novel experimental dental cement containing bioactive elements capable of high rates of calcium and phosphate ion release has been investigated by Xie et al. (2019). Materials containing calcium aluminate have also been suggested to be used as a dental cement to prevent demineralization by calcium and phosphate ion release and hydroxyapatite deposition.
Functional Near-Infrared Spectroscopy
Published in Yu Chen, Babak Kateb, Neurophotonics and Brain Mapping, 2017
Carlos G. Treviño-Palacios, Karla J. Sanchez-Perez, Javier Herrera-Vega, Felipe Orihuela-Espina, Luis Enrique Sucar, Oscar Javier Zapata-Nava, Francisco F. De-Miguel, Guillermo Hernández-Mendoza, Paola Ballesteros-Zebadua, Javier Franco-Perez, Miguel Ángel Celis-López
Anesthetized male Wistar rats will be implanted with a fixation device using dental cement, allowing the optic fiber to be near the occipital cortex. Additionally, stainless steel skull screws will be implanted through the skull into the visual cortex (7 mm behind the bregma and 3 mm lateral of the midline) as the positive electrodes. A reference screw electrode will be placed on the midline, 3 mm rostral to the bregma. Dental cement will also be used to fix the screws. One week after, the skin on the head is closed and the animal has recovered from the surgery. After correct signal amplification, filtration, and processing, to evaluate the correlation between the FOS and the electroencephalographic signal, we will evoke visual potentials to evaluate the function of the visual pathway. Light stimulation of the eye evokes visual electrical signals in the visual cortex. The visual potentials are analogous to auditory somatosensory evoked potential, which produce electroencephalographic cortical evoked potentials.
Studies of the early stages of the dynamic setting process of chemically activated restorative glass-ionomer cements
Published in Biomaterial Investigations in Dentistry, 2021
Fernanda M. Tsuzuki, Renata C. Pascotto, Luis C. Malacarne, Antonio C. Bento, Antonio Medina Neto, Lidiane Vizioli de Castro-Hoshino, Monique Souza, John W. Nicholson, Mauro L. Baesso
The initial reaction, after cement mixing, is an acid-base reaction between an aqueous polymeric acid solution and an ion-leachable basic glass powder [10,11]. When mixed with the liquid, the glass powder degrades so that Ca2+ or Sr2+ and Al3+ ions are released. These ions interact with carboxylate groups on the polymer chain, causing cross-linking and initial hardening. The setting reaction occurs rapidly, usually in the first minutes [12]. The final cement includes a substantial amount of unreacted glass particles acting as reinforcing fillers in the polymer matrix [10,13]. There is a further possibility for improving the properties of these materials to make them still more competitive compared with other restorative systems. Knowledge of the sequences of the setting reaction in dental cements is therefore crucial, as they will affect the handling and final physical properties of the cements [13].
Experimental study on the detection of cerebral hemorrhage in rabbits based on broadband antenna technology
Published in Computer Assisted Surgery, 2019
Haisheng Zhang, Mingsheng Chen, Gui Jin, Jia Xu, Mingxin Qin
According to the work of Chung et al. [18], most of the cerebral hemorrhages occur in the basal ganglia and the inner capsule, and the bleeding in basal ganglia often invades into the internal capsule. Therefore, experiments of inner capsule hemorrhage on rabbits were carried out in thisstudy. The experimental platform of cerebral hemorrhage in rabbits is shown in Figure 4, and the experimental steps are as follows:Thirteen rabbits (2.5 ± 0.3kg) were selected and anesthetized by injecting urethane (25%, 5ml/kg) via ear vein.In the case of complete anesthesia, a total of 4ml blood was extracted from the femoral vein of the rabbit, and stored in heparin anticoagulant tube.Take the skull ‘cross stitch’ intersection as the origin, the drill position, which was 6 mm to the right of the coronal suture and 1mm posterior to the sagittal suture, was determined. A needle tube with a diameter of 0.7 mm was inserted into the skull to a depth of 13 mm. Dental cement was used to seal the gap between the tube and hole, it played a role in fixing the needle and preventing leakage.Then the 3ml blood collected before was injected into the brain at the rate of 1 ml/min through an electronic injection pump. The injection was completed step by step with an increment of 1ml.The experimental data of 0, 1, 2 and 3 ml were recorded in the experiment, and the data processing was completed in software Matlab.
Retrospective physical dosimetry in the Czech Republic: an overview of already established methods and recent research
Published in International Journal of Radiation Biology, 2022
Daniela Ekendahl, Zina Čemusová, Dan Reimitz, Jakub Vávra
Dental ceramics include various glass-based materials, crystalline based materials with glass fillers and polycrystalline solids. The main components of these materials usually are quartz, alumina and other oxides (Shenoy and Shenoy 2010). Dental cement fillings are usually glass-ionomer materials, in which quartz represents one of the main components (Sidhu and Nicholson 2016). Importantly, the various crystalline compounds are radiation sensitive and may exhibit luminescence (Veronese et al. 2010).