Ultraviolet illumination as an adjunctive aid in dental inspection

Tooth-colored resin fillings have become increasingly popular as restorative materials. Their presence in the dentition presents a challenge to the clinician and the forensic odontologist, as detection of the fillings can be difficult both visually and radiographically. As they necessarily form part of the unique dentition of an individual, recognition of the resins is important for forensic identification. Alternative light sources have been used with success in various fields of forensic science. In recent years small LED flashlights emitting at specific wavelengths in the ultraviolet light (UV) range have been developed. Their low cost, small size, and ready availability makes their use practical in both forensic dental inspection and clinical settings. UV inspection is of interest because enamel, dentin and dental materials all have differing fluorescent properties when illuminated by UV light. It was one goal of this research to quantitatively assess the fluorescence properties of modern restorative resins in order to predict their behavior during inspection using UV illumination. The second goal was to demonstrate practical use of UV in dental inspection with examples of how different materials fluoresce. Quantitative measurements were obtained for optical emission wavelength and intensity for 15 modern resins using a spectrophotometer. Results indicated that resin brands fluoresce at different wavelengths and with varying intensities. Practical use and comparison of the flashlights revealed that the most useful excitation wavelengths for resin detection were in the UVA range (365 and 380 nm). Porcelain restorations and composite resin fillings exhibited different responses to these two wavelengths and thus use of both is recommended for forensic dental inspection.     

Estimating age in Maori, Pacific Island, and European children from New Zealand

The islands of New Zealand are populated by persons of European, Maori, and Pacific Island extraction. The purpose of this research is to quantify the levels of dental maturation of each of these three populations, in order to obtain data that will be useful in forensic identification and age estimation. The sample consisted of 1383 orthopantomographs (660 males, 723 females) of 477 Maori, 762 European, and 144 Pacific Island children between the ages of 3 and 14 years. Each radiograph was digitized and the stages of mineralization of the seven left mandibular permanent teeth were assessed using the eight stages described by Demirjian. Values for 1, 3, 5, 50, 95, 97, and 99% confidence intervals are listed for each maturity score. Intra-observer reliability was evaluated using Bland-Altman's method on data from re-scoring one out of every 20 radiographs and standard dental maturation curves were constructed for the three populations by means of a quantile regression method. Despite the fact that quantile regression analysis showed that across the age group investigated there were differences between boys and girls, knowledge of the sex does not increase the accuracy of the age estimate, simply because the magnitude of the error of age estimation is greater than the difference between the sexes. Our analysis also shows that population divergence is most marked after the age of 9 years, with a peak difference seen at age 10.     

Uniqueness of the Dentition as Impressed in Human Skin: A Cadaver Model*

Abstract: Bitemark interpretation assumes that the human dentition is unique and that its attributes can be accurately transferred to skin. A cadaver model was used to investigate whether the correct biter could be determined from similarly aligned dentitions once the dentitions were impressed in human skin. One‐hundred dental stone models, which were measured and determined to be unique, were divided into 10 groups based upon similarities of mal‐alignment patterns. One model was randomly selected from each group and bites were produced on unembalmed human cadavers. Metric/angular measurements and hollow volume overlays of the models were compared with the bites made. The percentage of dentitions from each group as well as the 100 dental model population that could not be excluded as the biter was determined. Results showed difficulty distinguishing the biter from individuals with similarly aligned dentitions and in some cases, an incorrect biter appeared better correlated to the bite.     

Power, crime and criminology in the new imperial age

As a consequence of the U.S. pursuit of neo-liberal global hegemony in the post-Soviet era, the language of empire has returned to political discourse and social analysis after an eighty-year absence. Although the pursuit of empire and the exertion of imperial control is deeply and demonstrably injurious to the nations and people subjected to this control, orthodox criminology has given relatively little attention to this emerging world of transnational social injury, choosing instead to continue its traditional focus on private crimes of greed, lust and rage. In this essay I detail how legal formalism, methodological individualism, ameliorative motives, mass-communications and the reward structure of orthodox criminology combine to form a meta-theoretical framework that has kept the criminological gaze averted from injurious actions of transnational structures of power. I then offer an alternative framework for a criminology of empire and other power crimes focused on how intersections among economic, political and cultural processes generate social injuries that are analogous to crimes in their nature and consequences, and that, as a result should become as significant a focus of criminological inquiry as the street crimes that now dominate criminological research and writing. What do we do with our knowledge about the suffering of others, and what does this knowledge do to us? -Stanley Cohen      

A Range of Postmortem Assault Experiments Conducted on a Variety of Denture Labels Used for the Purpose of Identification of Edentulous Individuals

Abstract:  Forensic organizations worldwide have recommended that dental prostheses should be labeled with at least the patient's name and preferably with further unique identifiers such as social security number, etc. The practice of denture marking has been conducted over many years and several denture marking systems have been reported in the dental literature. However, very little is known about the resilience of such systems to conditions experienced in the majority of post- and perimortem assaults. The purpose of this investigation therefore, was to expose a selection of 10 denture labels to a series of hostile environments. Results of the study indicate that the majority of the denture labeling systems appear capable of withstanding a range of common, and not so common postmortem assaults. With regard to thermal insult, however, most performed badly with the exception of a label constructed from stainless steel orthodontic band. However, another label in the form of an electronic RFID-tag performed above expectations in the majority of experiments. Furthermore, its cosmetic appearance has proven most popular with many patients.     

Specialization and versatility in sexual offenders referred for civil commitment

Offense specialization and versatility have been investigated in general offender populations, but have only recently been examined in sexual offenders. This study explored the extent of both tendencies in the criminal histories of 572 adult male sexual offenders referred for civil commitment. The specialization threshold and the diversity index were used to compare offender subgroups by referral status (committed versus observed) and offense type (rape, child molestation, and incest). Offense versatility was the more likely tendency across the sample. Committed and observed offenders did not differ. Although predominantly versatile, child molesters were significantly more likely than rapists to specialize in sexual offenses, and were also more likely to specialize in child molestation (compared to rapists specializing in rape). These results confirm previous findings on criminal versatility among sexual offenders. This adds to a growing body of research that questions universal and selective crime control policies designed exclusively for sexual offenders.     

Preliminary Study of Testosterone and Empathy in Determining Recidivism and Antisocial Behavior

Recidivism, repeated criminal behavior after conviction and correction of prior offenses, is a costly problem across the nation. However, the contribution of empathy in determining the risk of recidivism has received limited attention, although lack of empathy has been related to antisocial personality disorder in various studies. Studies linked testosterone to aggression, antisocial behavior, and criminality, and evidence support hormonal connections between empathy and aggression. Adult male prison inmates convicted of violent or nonviolent offenses were included in a cross‐sectional study of empathy, antisocial behavior, salivary testosterone, and recidivism. Subjects underwent criminal history, Empathy Quotient, Levenson Self‐Report Psychopathy Scale, Beck Depression Inventory, Spielberger State‐Trait Anxiety Inventory, and salivary testosterone assays. Bivariate analyses indicated multiple correlations between variables. Multivariate modeling analyses found a significant relationship between self‐reported conviction number and psychopathy scale score (p = 0.013). These preliminary results suggest avenues of investigation of factors contributing to recidivism risk.     

Windows 7 Antiforensics: A Review and a Novel Approach

In this paper, we review literature on antiforensics published between 2010 and 2016 and reveal the surprising lack of up‐to‐date research on this topic. This research aims to contribute to this knowledge gap by investigating different antiforensic techniques for devices running Windows 7, one of the most popular operating systems. An approach which allows for removal or obfuscation of most forensic evidence is then presented. Using the Trojan software DarkComet RAT as a case study, we demonstrate the utility of our approach and that a Trojan Horse infection may be a legitimate possibility, even if there is no evidence of an infection on a seized computer's hard drive. Up‐to‐date information regarding how forensic artifacts can be compromised will allow relevant stakeholders to make informed decisions when deciding the outcome of legal cases involving digital evidence.     

The Response of Skin to Applied Stress: Investigation of Bitemark Distortion in a Cadaver Model*

Abstract: Knowledge of distortional properties of skin is important in bitemark analysis. Thus, the response of skin to stress from bites was investigated. Four sets of models were created from the dentition of one individual. Anterior teeth were systematically removed to vary contact surface area. A biting apparatus was constructed with an integrated load cell. Forty‐six bites were created perpendicular to Langer lines on six cadavers. Rate of force application and bite pressure were controlled. Metric/angular measurement and hollow volume overlays were employed. Distortion produced by each dentition was calculated and assessed. Results showed that as teeth impressed loose tissue, mesial/distal distance increased, angles of rotation flattened, and inter‐canine distance lengthened. An opposite effect was seen in tight tissue. When the surface area of the dentition was reduced, a mixture of these effects was observed. Conclusions indicated that stiffness of the tissue was the most important variable in bitemark distortion.     

Are facial image analysis experts any better than the general public at identifying individuals from CCTV images?

The aim of this study was to examine the accuracy and reliability of a small group of facial imagery experts, and compare their abilities with members of the general public, to ascertain whether or not training and experience will affect the ability to identify faces from CCTV footage.A number of clips from CCTV footage were utilised alongside face pools. The participants were asked to identify the actor in each CCTV clip and provide a level of confidence in the decision.The experts tested in this study were consistently better at identification than the public, with almost double the identification rates and half the errors. These results suggest that training and experience in facial analysis will produce more reliable and accurate facial identification.