Decayed, filled and missing teeth as a forensic-odontologic aid for determining the age above 18 years: A radiographic study of orthopantomograms from a group of teenagers and young adults

The human teeth are a valuable source of information concerning identification and age calculation in forensic sciences. Dental treatment often causes permanent alteration of the teeth, which is visible on radiographs. The correlation of decayed, missing or filled teeth and chronological age has not yet been used for determining the accomplished 18th year of life in teenagers and young adults, e. g. for legal and anthropological purposes. The aim of this study was to determine whether the evaluation of these findings on radiographs correlates with the chronological age in teenagers and young adults. MATERIAL AND METHODS: The dental X-rays (orthopantomograms, OPG) of 1053 outpatients (age: 14 to 24 years) were evaluated. The values "decayed", "missing", or "filled" were recorded for each tooth present. The data were then calculated using statistical tools. RESULTS: The correlation between the number of missing teeth and the chronological age is low. However, the positive predictive value of determining the age of 18 years for certain types of teeth proved to be very high, even up to 100 %. Further, high numbers of filled teeth gave reasonable positive predictive values for an age of 18 years. The number of decayed teeth did not correlate with age. DISCUSSION: This study provides for the first time predictive values for the estimation whether a person is 18 years of age, based on the evaluation of decayed, missing or filled teeth on OPGs only. Whereas the number of patients with such findings is generally low in this age group, some of the positive findings can be used for age estimation as an adjunct to other sources of age calculation. The sole application of these items is not recommended, as sanitary conditions of the teeth depend on both social and individual circumstances. Therefore, the calculated values also reflect the culture of the sample studied. Finally, they are time-dependent and have to be compared to data from other populations. These results have some bearing on the field of forensic odontology.     

Can process conditionality enhance aid effectiveness?

Can process conditionality enhance poverty reduction in developing countries? We address this question in a political-economic framework with political distortions on the recipient and the donor side. Process conditionality is a useful tool only if the international financial institutions hold all necessary information to assess the political situation in recipient countries and to select the true representatives of the poor into a participatory process. If they do not hold this information or if bureaucratic interests reduce their incentive to acquire this information, process conditionality loses its effectiveness.     

Identification of DYS385 allele variants by using shorter amplicons and Northern Thai haplotype data

Primers currently used for amplification of locus DYS385 on the Y chromosome give quite long amplicons that are difficult to resolve on native polyacrylamide gels. We therefore designed new primers that give much shorter products for easy separation. With this system, two allele variants that were characterized by sequencing as 14.1 (GAAA --> GAAAA) and 14.2 (GA insertion), were identified in two unrelated Northern Thai men due to their decreased mobility. Interestingly, initial capillary electrophoresis mistyped the 14.1 variant amplified with the traditional primers as allele 14. Forty different haplotypes were found in 147 Northern Thais with a haplotype diversity of 0.9430. Haplotype 13-18 (frequency 0.136) is the most frequent one: for comparison: haplotype 14-18 (frequency 0.074) was found to be the most common in a population from Bangkok (n = 95) in an earlier study. This striking difference within Thailand's population probably results from genetic differences in the founding populations.     

Power and Policy Design: A Comparison of Green Taxation in Scandinavian Agriculture

This article demonstrates the political importance of policy design in overcoming the opposition to the use of green taxes directed towards producers. The purpose of the article is to establish the link between the political power of producers and policy design. It is argued that the more politically powerful they are, the more likely policy makers are to reimburse tax revenues, to give producers control over the spending of the revenue and to design tax schemes in which there is a direct relationship between the subject being taxed and pollution. A comparison of fertilizer and pesticide tax policy making in Denmark, Norway and Sweden supports this argument.     

Efficient Rent-Seeking in Experiment

In a series of experiments we show that people learn to playthe efficient outcome in an open-ended rent-seeking game. Thisresult persists despite quite different experimentenvironments and designs, like different propensities ofcompetition, group sizes etc., and is interpretable as aresolution of the so-called Tullock paradox which states thatreal-world rent-seeking expenditures are much lower than whatthe standard rent-seeking model predicts.     

The Creation of Normative Facts

In Kelsen's formalist and reductionisttheory of law, the concepts of `authority' and`competence' may be explained exclusively in termsof those norms on which the validity of other legalnorms or of legal acts is dependent. Kelsen describesthe nature of these norms in different ways; at leastthree different conceptions can be distinguished. Arational reconstruction of the most plausible of theseconceptions will understand sentences expressing such`norms of competence' either to state truthconditions for normative sentences of a lower level orto state criteria for an act to be a legal act. Inboth functions, norms of competence regulate thecreation of normative facts.