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- W2034192725 abstract "Clinical aspects and biochemical properties in the saliva of 21 patients prior to and following radiotherapy for head and neck cancer were evaluated (experimental group) and compared with the same properties in a control group of 21 subjects free of cancer. Salivary flow was evaluated by measuring the time necessary, in seconds, for the output of 2 ml of stimulated saliva; and the buffering capacity changes were determined using a simple colorimetric method. Total salivary protein concentration was determined by the Bradford 4 method. Amylase activity was measured by reducing sugars released from a soluble starch substrate, quantified by the dinitrosalicylic method. The electrophoretic profile was evaluated in polyacrylamide gel (12% SDS-PAGE) using samples of 5 mg of salivary protein. A statistically significant reduction (p < 0.01) of the salivary flow was observed, (162.47 s +/- 28.30 before and 568.71 s +/- 79.75 after irradiation), as well as a reduction in the salivary buffering capacity (pH 5.45 +/- 0.14 before and pH 4.40 +/- 0.15 after irradiation). No statistically significant alteration was observed in total salivary protein concentration. A statistically significant reduction (p < 0.01) of salivary alpha-amylase activity (856.6 ng/mg +/- 88.0 before and 567.0 ng/mg +/- 120.6 after irradiation) was observed. Electrophoretic profile differences in salivary protein bands were also observed after radiotherapy, mainly in the range of molecular weight of 72000 to 55000 Daltons. Clinically, patients presenting xerostomia induced by radiotherapy presented an increase in oral tissue injury." @default.
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- W2034192725 date "2004-03-01" @default.
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- W2034192725 title "Clinical and biochemical evaluation of the saliva of patients with xerostomia induced by radiotherapy" @default.
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