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The influence of some different factors on the accuracy of shade selection (2004)

Dagg, H. ; O'Connell, B. ; Claffey, N. ; [et al.]

Oxford, UK : Blackwell Science Ltd

Journal of oral rehabilitation 31 (2004), S. 0

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ISSN: 1365-2842

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: summary The purpose of this study was to elucidate some of the factors on which accurate shade taking depends. Custom shade tabs (0·5, 1·0 and 1·5 mm porcelain thickness) were fabricated from selected Vita and Shofu porcelains. Four main factors were investigated, namely, the difference between the two types of porcelain used, the effect of light quality, the effect of porcelain thickness and the experience of the observer. The chi-square test for independence at a probability level of P 〈 0·05 was used to analyse the results. The results indicated that in ideal light there was no difference between the two porcelains (P=0·58). The experienced observers proved better than the novice observers in ideal light conditions (P=0·003). Thickness was also significant in the overall results (P=0·0001), in that thicker samples gave more accurate results. The results indicate that in adverse light, there was an overall difference between the two porcelains (P=0·046), but no difference between the experienced and novice observers. The thickness made no difference to the experienced or the novice observer in adverse light. These results indicate that the most influential factor on shade taking was the light quality (P 〈 0·0001); better results were obtained overall for the ideal light situation. In ideal light thicker samples gave better results (P=0·0001).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-2842.2004.01310.x

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Numerical model of deep venous thrombosis detection using venous occlusion strain gauge plethysmography (2000)

Turner, I. C. ; McNally, M. A. ; O'Connell, B. M. ; [et al.]

Springer

Medical & biological engineering & computing 38 (2000), S. 348-355

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ISSN: 1741-0444

Keywords: Deep venous thrombosis ; Venous occlusion plethysmography ; Limb blood flow ; Theoretical model

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology , Medicine

Notes: Abstract Strain gauge plethysmography (SGP) is a non-invasive method used in the detection of deep venous thrombosis (DVT). The technique is based on the measurement of calf volume changes in response to venous occlusion by a thigh cuff, the volume changes reflecting the rates of arterial inflow and venous outflow. A numerical model of the blood circulation within the limb and the response of this to a SGP test has been derived, based on treating the different parts of the circulatory system in the leg as resistance and capacitance elements. The simulation results were compared with clinical studies and support the ability of SGP to detect non-occlusive clots of more than 50–60% of the lumen, as well detecting calf vein pressure appears to be a particularly important factor within the model. In addition, increases in venous tone due to post-operative venospasm were shown to be a potential source of false positive results.