Biomedical subjects
Publications and source records attributed to E S Duke.
The repair bond strength of three different brands of glass-ionomer restorative was tested over time. In this laboratory study, immediate repair of glass ionomer was possible with all three brands; however, over time the repair bond strengths decreased at different rates for the different materials.
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The authors investigated the shear bond strength of etched enamel retainers bonded to enamel reduced by different amounts. The depth of reduction in this study had no influence on bond strength.
The use of an alkaline wetting agent, used to neutralize phosphoric acid in the acid etch technique, was investigated with respect to improving the bond strength and microleakage behaviour of composite resin. The alkaline wetting agent has been shown to prevent the accumulation of calcium biphosphates, as a result of secondary recrystallization of hydroxyapatite, within the depths of etched enamel. To examine the influence of the alkaline wetting agent on bond strength, composite cylinders were prepared on enamel surfaces of extracted third molar teeth and tested for shear bond strength. Microleakage behaviour was observed on class V oval preparations in the cervical thirds of extracted third molars using a dye penetration technique. No significant improvement in shear bond strength was demonstrated with the alkaline wetting agent over conventional acid etching. In addition, the microleakage observed following the use of the alkaline wetting was characteristic of that for conventional acid etching.
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This investigation examines the influence of potential sources of contamination on the resin bond strength of a base metal alloy. Sixty specimens were cast in a base metal alloy and etched. Composite resin cylinders were bonded to six groups of ten specimens each and tested for shear bond strength using a testing machine at a strain rate of .5 mm/min. Five of the test groups received a different set of treatments, and one of the test groups was a control group. An analysis of variance disclosed no significant differences in bond strengths among any of the test groups at a level of P less than .05.
The purposes of this study were to locate games and simulations available for nursing education, to categorize these materials to make them more accessible for nurse educators, and to determine how nursing's use of instructional games might be enhanced. Twenty-nine games and simulations were identified in the nursing literature. The taxonomy developed for this study described three types of process games: clinical, pathophysiologic and psychosocial. These games were further analyzed using a modified version of Ruben's (1977) classification, which compared and contrasted games by structural components and control parameters. The taxonomy is intended to guide nurse educators in conveniently locating games and simulations which may fit or be tailored to fit individual learning objectives. Recommendations include instituting standards for describing games and simulations, establishing a clearinghouse for disseminating information on nursing games and initiating research on the effectiveness of games and simulations as instructional strategies.
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The effectiveness of various agents in cleaning cut dentine surfaces was investigated. Attempts to remove the smeared layer of dentine after the preparation of a cavity showed that a polyacrylic acid (Durelon liquid) gave the best result, flour of pumice or a prophylaxis paste (Prevodontic) used with a rubber cup were effective, but 3% hydrogen peroxide and a cavity cleaner (Cavilax) were not. The only effective agents following the use of a zinc oxide eugenol temporary cement were the flour of pumice and prophy paste.
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