Effect of bleaching agents on calcium loss from the enamel surface.

Objectives: To compare the Ca2+ loss of enamel treated with 38% hydrogen peroxide (HP), 35% HP with light, and 10% carbamide peroxide (CP).

Method And Materials: Ten extracted premolars were sectioned buccolingually and longitudinally so that 4 specimens were obtained from each tooth. The specimens were randomly assigned to 1 of 4 groups to receive the following bleaching agents: 38% HP, 35% HP with light, 10% CP, and no agent (control).

A validated cold vapour-AAS method for determining mercury in human red blood cells.

A cold vapour-atomic absorption spectrometry (CV-AAS) method for determining mercury in dental students and clinical teaching staff red blood cells at a dental school using amalgam as a restorative material has been validated. A number of blood samples (n = 122) from dental students in years I to V, clinical teachers in restorative dentistry and controls were collected and analysed. Accuracy, linearity, precision (repeatability and reproducibility) and robustness of the method have been determined, and detection and quantification limits have been calculated.

Estimation of basic uncertainties in clinical analysis.

Clinical analyses have a vital importance in human health. Thus, it is necessary to have reliable analytical information which depends on a good assessment of accuracy and this can be obtained by minimization of uncertainty values. The uncertainty values are complex and arise from different sources such as sample, method, instrumentation and data processing.

Blood mercury levels of dental students and dentists at a dental school.

Objective: To determine the blood mercury levels in dental students and clinical teaching staff in a dental school using amalgam as a restorative material.

Setting: A dental school in Ege University, Turkey surveyed during one academic year.

Subjects And Methods: Cross-sectional study of groups of dental students (n=92) in years I to V, clinical teachers in restorative dentistry (n=16) and controls (n=14).

The effects of food withdrawal and darkening on lipid peroxidation of laying hens in high ambient temperatures.

The aim of this study was to investigate the effects of feed withdrawal and darkening on the antioxidative status of laying hens in high ambient temperatures between 30-40 degrees C. We determined vitamins A and E, lipid peroxidation as thiobarbituric-acid reactive substances (TBARS), glutathione peroxidase (GSH-Px) and reduced glutathione (GSH) in the serum, liver and muscle. Sixteen week old hens (Ross Brown) were divided into 3 groups of 30 hens each.