Third molar development in a London population of White British and Black British or other Black ethnicity

Population differences in dental development between Black and White ethnic groups have been debated but not previously studied in the UK. Using inappropriate data for dental age estimation (DAE) could lead to erroneous results and injustice. Data were collected from dental panoramic radiographs of 5590 subjects aged 6–24 years in a teaching hospital archive. Demirjian stages were determined for left-sided teeth and third molars and data collected regarding hypodontia and third molar agenesis. Third molar development in self-assigned Black British, including other self-assigned Black ethnicity, was compared with that of self-assigned White British subjects. Data were compared for males and females in the two ethnic groups using T-tests for Demirjian Stages A–G of third molar development and Mann-Whitney tests for Stage H once a cut-off age at the maximum age for Stage G had been imposed. Third molar development occurred earlier in subjects of Black ancestry compared to those of White ancestry. While both ethnic groups showed large age ranges for every third molar stage, in female subjects these generally occurred at least 1.5 years earlier, and in males at least one year earlier. Hypodontia and third molar agenesis were more prevalent in White British, but the ethnic difference in third molar development persisted in subjects with complete dentitions. This is a large study that confirms ethnic differences in a London population, emphasises the difficulties of establishing the 18-year-old threshold using DAE, and confirms the risk of overestimating the age of individuals of Black ethnicity using White ethnic reference data.     

MEDIATION AND DIVORCE

This article describes the Danish system, tracing its roots from the days when the crown dealt with all matters involving the family. The role of the amtmen in granting divorce through this administrative process is described. A total of 94% of all divorces in Denmark are handled through this procedure.     

Analysis of thin-layer chromatograms of paint pigments and dyes by direct microspectrophotometry

The Nanospec 10S microspectrophotometer has been used to produce reflectance spectra over the 380–900 nm range from coloured thin-layer chromatography spots. The method has been applied to extracted paint pigments and to dyes from other materials examined in forensic science.     

Evaluating the effects of automobile safety regulation

Automobile safety standards adopted because of federal legislation have, according to many researchers, failed to save lives; safer cars, they infer, induce more dangerous driving. Results from the major study suggesting this conclusion are shown, however, to be quite sensitive to reasonable changes in the empirical model. An alternative statistical analysis of death rates supports a very different conclusion: Safety standards have saved tens of thousands of lives during the 1970s. More broadly, the article illustrates some general pitfalls in using statistical results in policy analysis, and how they can be avoided.     

Reviews

Seweryn Bialer, The Soviet Paradox: External Expansion, Internal Decline. London: I. B. Tauris, November, 1986, xx + 396 pp. £16.50.

Frank Füredi, The Soviet Union Demystified: A Materialist Analysis. London: Junius Publications, 1986, 271 pp. £12.50 h/b, £5.95 p/b.

R. Furtak, The Political Systems of the Socialist States: an Introduction to Marxist‐Leninist Regimes, Wheatsheaf Books Ltd., Brighton, 1986, xi + 308 pp. £32–50.

Peter Jones and Sian Kevill (Compilers) China and the Soviet Union 1949–84, Keesing's International Studies; Longman, London: 1986, 202 pp. £20.00.

Roy Medvedev, China and the Superpowers, Basil Blackwell, Oxford; 1986, 234 pp. £17.50.

Gail Schlachter (ed.) Sino‐Soviet Conflict: A Historical Bibliography, ABC‐Clio Distribution Services, Clio Press, Oxford; 1985, xii + 190 pp. £30.50.

Károly Attila Soós, Terv, Kampany, Penz. Szabalyozas es Konjunkturaciklusok Magyarorszagon es Jugoszlaviaban, Közgazdasagi es Jogi Könyvkiado‐Kossuth Könyvkiado, Budapest, 1986, 533 pp. 142 Ft.

William V. Wallace and Roger A. Clarke, Comecon, Trade and the West, Frances Pinter (Publishers), London, 1986, xi + 176 pp. £18.50.

Alec Nove, Socialism, economics and development, Allen & Unwin, London, 1986, 243 pp. £25.00 US $29.95.

Klaus Fritsche, Blockfreiheit aus sowjetischer Sicht, Deutsches Übersee‐Institut, Munich, Cologne, London, Weltforum Verlag, 1986, 299 pp.

Winrich Kühne, Sowjetische Afrikapolitik in der ‘Ara Gorbatschow’. Eine Analyse ihrer grundlegenden Probleme Mitte der 80er Jahre, ausgehend von den Entwicklungen in Mozambique, Angola und Äthiopien. Stiftung Wissenschaft und Politik, Ebenhausen, 1986, 146 pp.