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Angina is the most common symptom of ischaemic heart disease and is frequently treated by the administration of nitrates. These three cases highlight dental sequelae of prolonged administration of sustained-release glyceryl trinitrate applied to the oral mucosa.
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Variations in the polymer/monomer mixing ratios from 1.5:1 to 4.5:1 vol/vol have been evaluated to determine the effect on dimensional accuracy and impact resistance of a PMMA homopolymer. Two polymerisation cycles were used. It was shown that a wide variation in mixing ratios (1.5:1 to 4:1) had no effect on dimensional accuracy or impact resistance and that a polymerisation cycle that includes a final boiling period is preferred. It was further found that notched impact resistance was almost an order of magnitude below unnotched impact resistance, emphasising the weakening effect of sharp contours on the impact resistance of denture resins.
The time taken to create a more natural prosthesis by twisting a tooth, carving wax and applying a few basic colors can make a world of difference for patients wearing dental prosthesis. The technician can achieve a natural resemblance of tissue coloration in the oral cavity when these procedures are applied.
Three primers were evaluated to determine their effect on the strength of the bond when Silastic 891 is cured to poly(methylmethacrylate). Silastic cured directly to the poly(methylmethacrylate) without a primer was used as a control. All primers increased the bond strength but one of the primers was definitely superior to the others.
Proponents of injection molding systems have claimed a number of benefits over conventional press-pack dough molding systems. The aim of this study was to evaluate a recently developed injection (dry heat) procedure of processing compared with press-pack dough molding utilizing three curing cycles. The dimensional accuracy and stability of acrylic resin bases produced by the two molding procedures were compared. Dimensional changes were assessed over a period of 4 months using an optical comparator. The results demonstrate that baseplates produced by the injection molding procedure exhibit less shrinkage than those produced by the conventional press-pack procedures.
Comparative investigations of 2 acrylic compounds: Ethacryl and Dacryl-4b are reported. In 240 white rats blood serum lysozyme was studied during 3 days to 6 months. Comparative data evaluation showed that Dacryl-4b had substantially less adverse action on the organism than did Ethacryl. As soon as after 3 months the serum lysozyme levels in experimental group was close to that of sham-operated rats. Encouraging results suggest further investigation into the properties of Dacryl-4b.
The typography of polymethyl methacrylate processed against various gypsum products coated with various separating materials was studied under an SEM. Tinfoil and two commercial tin foil substitutes were used as separating material during processing, and the surfaces of the resulting acrylic resin forms were studied for topographical differences. Tinfoil and alpha 2 hemihydrates produced the smoothest surfaces. As a practical solution, a good quality tinfoil substitute and alpha 1 hemihydrate could be used when processing polymethyl methacrylate resin.