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Objectives: To review governmental guidelines on amalgam use worldwide and to assess trends in the usage of amalgam and composite materials in restoration of posterior teeth. Methods: A letter was sent to 24 government health agencies or representative organisations requesting details of regulations pertaining to amalgam use. A literature search was carried out in order to identify papers in which the incidence of amalgam and composite restorations was stated. Results: Ten replies were received, indicating few restrictions on the use of amalgam. Results obtained from published work appear to indicate that amalgam use is declining, but at rates which are unclear in many countries because of the paucity of published data. Amalgam use has been found to be decreasing in the USA, Australia and Scandinavia, with lesser decreases being apparent in the UK. Conclusions: There are few restrictions to the use of amalgam worldwide. In countries where data are available, such as USA, Australia and Scandinavia, amalgam use has been found to be decreasing, with smaller decreases being apparent in the UK. [ABSTRACT FROM AUTHOR]

Clinical trials for the treatment of schizophrenia now often include cognitive assessments in addition to clinical ratings of symptoms. Recently, these trials have included cross-national assessments. It is not clear if translated psychological tests produce consistent results across different languages. This paper presents the results of a study of the comparability of the results of cognitive assessments in different English-speaking countries and a number of countries where tests were translated into other languages. Performance on tests of executive functioning, verbal and visuo-spatial learning and memory, language skills, psychomotor speed, and vigilance was compared across the first episode patients with schizophrenia (n=301) assessed in six different languages (English, French, Finnish, German, Hebrew, and Afrikaans), including two different countries where patients were assessed in English and other languages: Canada (French) and South Africa (Afrikaans). The variance in performance across the sites tested in English was as large as the variance between English and non-English speakers when all tests were considered. Performance differences across English and other languages were found only for executive functions, vigilance, and psychomotor speed, with executive functioning differences nonsignificant when education was considered. No differences were found between English and non-English speakers in Canada. These results suggest that the translation of tests of memory and verbal skills can lead to consistent results across translated versions of the tests. Differences between countries were greater than differences between languages, suggesting the need to consider representativeness of patient samples in terms of local educational attainment. In general, these data support the validity of cross-national neuropsychological assessments. [Copyright &y& Elsevier]