This study examined and compared surface of human dentine after acidic etching with hydrogen peroxide, phosphoric acid liquid and gel. Surface demineralization of dentin is necessary for a strong bond of adhesive at dental surface. Split human teeth were used. After application of mentioned substances at dentin level measures of the contact angle and surface morphology were employed. Surface morphology was analyzed with the help of scanning electron microscopy and atomic force microscopy. Liquid phosphoric acid yielded highest demineralization showing better hydrophobicity than the rest, thus having more contact surface. Surface roughness are less evident and formed surface micropores of 4 �m remained open after wash and air dry providing better adhesive canalicular penetration and subsequent bond.
Several techniques are used to reconstruct the anterior cruciate ligaments (ACL) by using different grafts in order to obtain a new ligament with properties closest to those of the healthy one. Our aim was a faster graft harvesting and the integration into the bone tissue; we have studied the efficiency of the techniques that preserve the torn ligament end vs. the techniques that used a graft harvested from the patient. The ligamentoplasty studies performed on rabbits reveal a satisfactorily cost-efficiency ratio, this being the main reason for choosing this model. We wanted to study the importance of preserving one edge of the torn ligament as a base of integration for the new graft and compare the appearance of the blood vessels and the neoformation tissue in the two study groups. For the first study group we performed an implantation technique that uses a complete new graft harvested from the same animal and for the second group we used the technique which preserves the torn ligament. All the surgical procedures were conducted on the NZW rabbits. All ligamentoplasty reconstruction surgical interventions were conducted on the left limb and the graft was harvested from the extensori digitorum longi located on the lateral side of the rabbit�s thigh. Twelve rabbits in each group were operated upon using the two techniques and the results were compared. No major complications were noted, the long term results were similar, and with no significant differences as far as the ligament integration was concerned. The study group in which the ligament end was preserved showed a more rapid integration. Our study suggests that keeping a longer ligament end correlates with early graft integration.
The work represents a comparative study of three type of metallic food package used in Romanian food industry. In this paper, three food packages made of low-alloy steel were analyzed. To characterize their properties, spectrometric analyzes were performed to determine the chemical composition, microhardness analyzes, optical microscopy and Fourier Transform Infrared Spectroscopy. The investigations on the three samples were achieved through X-ray Fluorescence Spectrometry (XRF) analysis performed with a Spectro XEPOS analyzer, optical microscopy analyzes performed on a Reichert UnivaR optical microscope, and microhardness tests by the Vickers method using the CV - 400 DTS tester / 2 (CV Instruments) and Fourier Transform Infrared Spectroscopy (FTIR) with JASCO 6200 analyzer, equipped with Golden Gate type attenuated total reflection (ATR) device. Following the investigations, the presence of epoxyphenolic resin was confirmed in the case of the first two samples and a layer of polyester in the case of sample three. Finally, conclusions are presented about the qualities of the selected packaging and their properties to keep safe the packaged products for a period of several months to several years.
In this paper were evaluated from a quantitative and qualitative point of view the retraction of the marginal periodontal tissues, using a holographic technique, subsequently validated through measurements accomplished with the help of acknowledged, consecrated soft wear.
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