Lingual markings of anterior teeth as seen in human bite marks

A review of the available literature does not reveal a plausible explanation as to why the incisal edges of maxillary anterior teeth do not always mark clearly. Generally, the mandibular incisal edges do mark with some consistency. This paper demonstrates through test bites on skin that the answer lies in the position of the mandible.     

Measurement of arch widths in a human population: relation of anticipated bite marks

The authors compared arch width measurements of diagnostic dental models obtained from dental school patients. Arch width measurements were taken in the canine area on each dental cast in an effort to assist forensic dental investigators in matching certain classes of subjects to the bites they might possibly inflict. If any canine teeth were absent, the measurements were taken using other specified adjacent teeth which the investigators felt would be interpreted as the arch width determiners in a bite mark injury. The ages of the subjects varied from 14 to 87 years. Statistical comparison of the maxillary arch width, mandibular arch width, and the mean difference between maxillary and mandibular arch width were performed. Significant differences between the arch width measurements were found to exist between several classes of subjects based on race and sex.     

An examination of the psychological aspects of bite marks

The intent of this paper is to present some psychological threads which appear to be operative for the perpetrator of bite marks. In the catalogue of multiple motivations, there appears to be a current theme of power, control, potency, and the attempt to have a psychological symbolization of the perpetrator's omniscient capacity for absorbing life essences. In an examination of these highly complex needs, the modern perpetrator appears to act out consistently with cultural biases coupled with immediate psychological needs which have pressed for expression. Due to a pattern of psychologically expressed ritualism, the perpetrator will often inadvertently leave important psychological clues at the crime scene. The attack style, mode of death, characteristics of the victim, etc.--these components reveal the information on the type of psychological needs that the perpetrator is trying to satisfy. In the cases of bite marks associated with violent crime, it becomes crucial to an "investigator" what type of personality characteristics are welded together to form this kind of need complex. After reviewing cases reported in the literature and after conducting psychological interviews with perpetrators, three major groups of perpetrators seem to be apparent. The first group is motivated out of an anger track, the second group is motivated out of sadistic biting, and the third is out of the more traditional "cannibal complex" motif.     

An integrated technique for the analysis of skin bite marks

The high number of murder, rape, and child abuse cases in South Africa has led to increased numbers of bite mark cases being heard in high courts. Objective analysis to match perpetrators to bite marks at crime scenes must be able to withstand vigorous cross-examination to be of value in conviction of perpetrators. An analysis technique is described in four stages, namely determination of the mark to be a human bite mark, pattern association analysis, metric analysis and comparison with the population data, and illustrated by a real case study. New and accepted techniques are combined to determine the likelihood ratio of guilt expressed as one of a range of conclusions described in the paper. Each stage of the analysis adds to the confirmation (or rejection) of concordance between the dental features present on the victim and the dentition of the suspect. The results illustrate identification to a high degree of certainty.     

The use of videotape to demonstrate the dynamics of bite marks

Traditionally, bite mark photographs have been used to study statically a dynamic event. With the advent of the compact video camcorder, odontologists can now document bite marks on video tape and, in some instances, with the model of the suspect's dentition, may be able to record the dynamics of a bite on human flesh. A review of two cases and equipment used is discussed.     

A suggested classification of bite marks in foodstuffs in forensic dental analysis

Bite marks have been reported in flesh, foodstuffs and inanimate objects. Those in foodstuffs occur widely in cases of larceny but also occur in serious crimes such as murder.Evaluation of distinctive characteristics in food bites differs from the corresponding assessment of flesh bite marks in that the assessment is made on the impression made by the labial aspect of the teeth and not on the biting edge, because the teeth penetrate the bitten foods to different depths.The terminology used to describe food bite marks is very varied and a classification of food bites has been formulated in an effort to bring a degree of uniformity to the analysis of such marks.     

Not all bite marks are associated with abuse, sexual activities, or homicides: a case study of a self-inflicted bite mark

A case of self-inflicted bite mark during an episode of myocardial ischemia is presented. Using current bite mark identification techniques, the bite mark was shown to be self-inflicted. Self-biting may be an emotional response to pain or a type of counterirritation to alleviate pain. The recognition and documentation of this unusual case of a self-inflicted bite mark was due to the cooperation of the forensic pathologist and forensic odontologist.     

Incidence of bite marks in a selected juvenile population: a preliminary report

A study of the frequency of bite marks among sheltered children was conducted for a period of three months in the juvenile care facilities in Las Vegas, NV. The study demonstrated an incidence of 1 545 bite marks per 100 000 population. Analysis of the age, sex, and location of bite marks is presented. The study demonstrated an incidence comparable to diseases such as gonorrhea.     

Seven hundred seventy eight bite marks: analysis by anatomic location, victim and biter demographics, type of crime, and legal disposition

A study of the etiology, anatomic location, victim demographics and legal disposition of bite mark cases was made with the purpose of updating and augmenting previous research in the field. The information may be of interest to a myriad of professional disciplines including Forensic Odontologists, Medical Examiners, Detectives, Profilers, Emergency Room Personnel, Coroners, Psychologists, and Family Service Counselors, as bite marks provide both physical and biological data. While bite marks were found on all anatomic regions of the body some sites are significantly more likely to receive bites, and the frequency that an area is bitten may vary with the type of crime. Sex and age of the victim may also impact the resulting location and frequency of bites. A survey form for bite mark cases was created and mailed to all Diplomates of the American Board of Forensic Odontology. The survey form was also included in the American Society of Forensic Odontology newsletter. The survey requested that the recipient fill out a separate form for each case for which the recipient was the primary investigator of a patterned injury. The data from the resulting surveys were entered into a Microsoft Excel spreadsheet. The responses detailed two hundred thirty two (259) bite mark cases that included seven hundred (778) individual bite marks. Harvey (1976) and Sweet and Pretty (2000) published studies finding the highest percentage of bites to the breasts. In 1983 Vale and Noguchi published the paper indicating that the most frequently bitten area was the upper extremities. The survey forms were sent to approximately 1100 forensic dentist in 26 countries. The forensic experience level of the dentists varied from neophyte to very experienced. The data were analyzed and the results reported and organized in the following categories; Victim Distribution by Gender, Victim Distribution by Age, Child Abuse Distribution by Age and Gender, Sexual Assault Distribution by age and Gender, Homicide Distribution by Age and Gender, Bite Mark Distribution by Gender and Location, Number of Bite Marks per Victim, Bite mark Distribution Comparison to Previous Research, Child Abuse Suspect Age Distribution by Age and Sex, Homicide Suspect Age Distribution by Age and Sex, Sexual Crimes Suspect Age Distribution by Age and Sex, and Bite Mark Incidence by Anatomical Area and Type of Crime. Fifty-two forensic odontologists from seven countries responded. Nineteen responders were Diplomates of the American Board of Forensic Odontology. The number of cases reported by each responder ranged from one to thirty-three and the average number of cases reported was 4.5. In this broad based study, females were bitten more often than males. The average male victim was younger than the average female victim. Males that were victims tended to be either very young or very old. The youngest victim was a two-month-old boy and the oldest victim a 95-year-old woman. Perpetrators were male more often than female and there was an average of 1.4 suspects per case. The results show that most bites occurred on the arm, followed by the breast. If broken down by gender, males were bitten on the arm more than females, and females were bitten on the breast more often than males. The data show patterns in location and number of bites that seem related to both the type of crime and the age of the victim.     

Classification of human breast morphology important to bite mark investigation

There is a great range of variability in human breast size and resiliancy that may have an effect upon the interpretation of bite marks. A proper understanding of the normal range of breast morphology and a system of classification is necessary for an understanding of distortion effects, as well as the precise communication of those effects to others. A classification is given for the morphology of the female human breast following a review of the literature.     

人体皮肤索沟局部肥大细胞脱颗粒率的观察

本文观察人体皮肤索沟局部肥大细胞脱颗粒率变化。发现生前皮肤损伤局部脱颗粒率在皮肤受在处及距受压边缘０～１．０ｍｍ区域明显升高（＞４９％），与死后皮肤索沟有显著差异（Ｐ＜０．００１）。作者认为损伤局部肥大细胞脱颗粒率明显升高（＞４９％）可作为人体生前索沟的诊断依据。     

A comparison between direct and indirect methods available for human bite mark analysis

Comparison techniques used in bite mark analysis are many and varied, the choice of technique depending largely on personal preference. Until recently, no one technique has been shown to be better than the others, and very little research has been carried out to compare different methods. This study evaluates and compares the accuracy of direct comparisons between suspects' models and bite marks with indirect comparisons in the form of conventional traced overlays of suspects' models or a new method using photocopier-generated overlays. Artificial bite marks in pigskin were made using standardized sets of models and recorded as photographs and fingerprint powder lifts on tape. The bite mark photographs and fingerprint lifts were coded and randomized so that a blind comparison could be made with the models, traced overlays, and photocopier-generated overlays using a modified version of the American Board of Forensic Odontology Scoring (ABFO) System for Bite Marks. It was found that the photocopier-generated overlays were significantly more accurate at matching the correct bite mark to the correct models irrespective of whether the bite mark was recorded photographically or as a fingerprint lift. The photocopier-generated overlays were also found to be more sensitive at matching the correct bite marks to the correct models than the other two methods used. The modified ABFO scoring system was able to discriminate between a correct match and several incorrect matches by awarding a high score to the correct match.     

Establishing a family of marks

In opposition proceedings, a family of HOG-based trade markswas successfully established on the record and found to be sufficientbasis to support an opposition against applications to registerDIRT HAWG and WATER HAWG.     

两例皮肤上咬痕的DNA鉴定

在实际侦查中,皮肤上咬痕的鉴定比较注重咬痕的痕迹特征检验。由于人的皮肤在记录咬痕方面是一种很差的介质,有些咬痕特征不能得到明显的反映,因而在个人识别上的利用价值不大。应用PCR-STR技术对咬痕留在皮肤上的唾液斑进行多态DNA位点分型,可以达到个人认定或排除的目的。现就我室受理的两例皮肤上咬痕的DNA检验报告如下：     

Trade marks plus? the role of trade marks in the global economy and the danger of over-protection

This article examines the economic role of the trade mark, both as a structuring device and as a means of adding value to products. It shows how its role as a flexible structuring device that provides a distinct focus for goodwill derives from the special meaning of the term “origin” or “trade origin” in trade mark law, this being what a trade mark is supposed to indicate. Firms can control the identity that a trade mark signifies and confers on the products with which it is used without being tied to any particular set of production arrangements. This article also considers how goodwill can be a source of economic benefit both through reducing transaction costs and, in some cases, through adding value to products. This article then examines the economic rationale for the legal protection of trade marks and shows how this is analogous to the rationale for awarding property rights over tangible resources and different from that for other forms of intellectual property right. The pressure to expand the legal protection of stronger trade marks is explored and it is accepted that there is an economic case for doing so. However, it is argued that the additional protection must be carefully calibrated through definitions that take account of its economic rationale and avoid the danger of over-extending it. In particular, this danger of over-protection arises from making a false analogy between stronger trade marks and the kind of intangible output that is the subject of the other forms of intellectual property right.     

Two bite mark cases with inadequate scale references

Most literature addressing comparisons between epidermal bite marks and the perpetrator's bite pattern mandates fastidious coordination between the size of the compared reproductions. While ideal, this is not possible in every case and inability to control this variable in selected cases may not necessarily invalidate the comparison. The first case involves a known perpetrator. All photographic measurements were recorded with acceptable techniques to discover a serious discrepancy in arch size. The second case was degraded by the absence of a ruler in a tangentially made photograph of a bite mark. In both cases, the weight of the conclusions were lessened by these problems but the impartial handling of the evidence and explanation of discrepancies offered credibility to the analyses. Both cases illustrate that a technical infraction in processing and recording bite marks, though serious, need not automatically preempt the analysis.     

两例皮肤上咬痕的DNA鉴定

在实际侦查中 ,皮肤上咬痕的鉴定比较注重咬痕的痕迹特征检验。由于人的皮肤在记录咬痕方面是一种很差的介质 ,有些咬痕特征不能得到明显的反映 ,因而在个人识别上的利用价值不大。应用ＰＣＲ -ＳＴＲ技术对咬痕留在皮肤上的唾液斑进行多态ＤＮＡ位点分型 ,可以达到个人认定或排除的目的。现就我室受理的两例皮肤上咬痕的ＤＮＡ检验报告如下 :一、材料与方法1.我室在 1999年 6月及 8月受理的两起咬痕案例 ,检材为血液 (痕 ) ,唾液斑。2 .皮肤上咬痕唾液斑提取 :用干净消毒后的 1ｃｍ2 纱布沾取蒸馏水后 ,用镊子夹着纱布以同心圆方式由里向外…     

头颅放射影像资料的同一认定

利用放射影像资料进行法医临床学鉴定案例越来越多。同一认定常使用的标志包括牙齿、头颅、脊柱等相关特征结构。头颅放射影像资料,包括X片及CT片中的额窦、乳突、蝶鞍、颅缝及其他结构均可作为同一认定的标志。目前,我国法医放射学尚属起步阶段,应加强此方面的研究。     

不同类型线缆剪剪切痕迹的区别

目的　研究三种类型线缆剪剪切线缆的痕迹差异 ;　方法　观察、归纳三种线缆剪形痕的宏观、微观痕迹反映形态 ;　结论　可以根据断头的整体形态、线条流向、弧度、立顶形态和顿剪痕迹等来分析线缆剪的种类。