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 Table of Contents  
ORIGINAL ARTICLE
Year : 2021  |  Volume : 6  |  Issue : 1  |  Page : 3-7

Visual inspection of standard photographs taken from skull and mandible to set anthropological profile: A pilot study


1 Department of Pathology and Forensic Medicine, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil
2 Department of Stomatology, Public Health and Forensic Odontology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil

Date of Submission23-Jul-2020
Date of Acceptance01-Jul-2021
Date of Web Publication30-Jun-2021

Correspondence Address:
Dr. Ricardo Henrique Alves da Silva
Department of Stomatology, Public Health and Forensic Odontology, School of Dentistry of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP
Brazil
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijfo.ijfo_16_20

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  Abstract 


Background: Despite the effectiveness and accuracy of the primary methods of human identification based on comparison between post- and antemortem information, in cases where there is no possibility of confrontation due to the absence of antemortem data, auxiliary methods can establish a profile of the victim and direct a search that may culminate in identification. Forensic anthropology is the field that can assist in human identification cases through the analysis of bone remains, which can collaborate in the definition of a possible profile of the victim, called an anthropological profile.
Aim: Analyze the applicability of the visual inspection of standard photographs of the skull and mandible for sex, age, and ancestry.
Materials and Methods: Ten skulls and their respective jaws were photographed, and a file with all the photographs was made available by an online platform to a group of ten criminal experts (specialized in forensic odontology) who filled a form with information about sex, ancestry, and age.
Results: Were obtained percentages of correctness and error of 67.86% and 32.14%, respectively, for sex determination, 88.57% and 11.43% for age estimation, and 63.57% and 27.86% for ancestry, with 8.57% of responses left blank in the last one.
Conclusion: Visual inspection of the standard photographs of the skull and mandible for the establishment of anthropological profile presented limited findings, and need to be carefully analyzed and applicable only if the direct examination is not possible..

Keywords: Forensic anthropology, forensic dentistry, photography, victim identification


How to cite this article:
Costa PB, Magalhães LV, Sá dos Santos JB, Guimarães MA, Alves da Silva RH. Visual inspection of standard photographs taken from skull and mandible to set anthropological profile: A pilot study. Int J Forensic Odontol 2021;6:3-7

How to cite this URL:
Costa PB, Magalhães LV, Sá dos Santos JB, Guimarães MA, Alves da Silva RH. Visual inspection of standard photographs taken from skull and mandible to set anthropological profile: A pilot study. Int J Forensic Odontol [serial online] 2021 [cited 2021 Oct 20];6:3-7. Available from: https://www.ijofo.org/text.asp?2021/6/1/3/320371




  Introduction Top


Identity is the particular set formed by morphological and psychical characteristics capable of characterizing each human being and attributing unique qualities.[1] Human identification is a process of extreme relevance in the social context, since it can act in the resolution of criminal investigations and in civil cases.[2]

The process of human identification requires the use of scientific methods based on qualitative and quantitative variations of the human body.[3] According to INTERPOL, primary identification methods are DNA, ridgeology (fingerprints) and dental analysis. They are defined as those capable of establish identity without complementary methodologies and are considered the most reliable in human identification.[4]

Despite the effectiveness of the primary identification methods, these are based on comparison processes, requiring the prior information of the victim or possible preestablished suspects, but access to antemortem information is often not possible.[5] The secondary methods are used in an attempt to establish a profile of the victim and direct the search that can culminate in identification.

Forensic anthropology is a science that can help through the analysis of bone remains that can collaborate in the estimation of a possible profile of the victim, called an anthropological profile. Within this profile, it is possible to estimate characteristics such as sex, age, height, and ancestry, and the remains may indicate the moment of death, presence of traumas, and possible pathology that led to death.[6]

With regard to the anthropological profile, it is known that the skull is able to provide a lot of information. Although most of the bones that are found are not complete, in a large number of cases the skull is present, as was verified in a survey carried out on bones sent to a Center of Legal Medicine in Brazil, analyzing the period between the years of 2007 and 2009, where about 87.5% of these skeletons had the skull present.[7]

However, even with bone remnants available, sometimes the forensic service cannot count on trained professionals to perform this specific examination, and the absence of these professionals may end up leading to lack of technical-scientific analysis and devaluation of available evidence.[8] An alternative could be photographs of bone remnants with useful information to anthropology so that, through the inspection of these images, a trained professional, even if at a distance, could assist to set an anthropological profile. For this purpose, the use of photographic protocols is important to make the process more agile and practical.[9]

Scorsato, in 2012, showed that photographs have a great contribution to the forensic sciences regarding the cases of identification, description, and control of individuals.[10] Even so not much is known about their potential in establishing an anthropological profile and whether this profile will be similar to that established by the actual examination of the bone. Thus, the aim of this study was to analyze the applicability of the visual inspection of standard photographs of the skull and mandible for the determination of sex, age, and ancestry within the establishment of the anthropological profile.


  Materials and Methods Top


The study was approved by the Research Ethics Committee (CAAE: 62490916.3.0000.5419). The sample of this pilot study consisted of ten skulls and their respective jaws, all belonging to stored skeletons. The skulls were photographed according to the protocol preestablished by the researchers in order to cover the greatest number of possible characteristics, addressing them in frontal, posterior, right lateral, left lateral, upper, lower, and occlusal photographs [Figure 1]. In relation to the mandible, photographs were taken from the frontal, posterior, right lateral, left lateral, and occlusal views [Figure 2].
Figure 1: Demonstration of the photographic protocol performed in the skull containing the frontal (a), posterior (b), right lateral (c), left lateral (d), upper (e), inferior (f), and occlusal (g) views

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Figure 2: Demonstration of the photographic protocol performed in the mandible containing the right lateral (a), anterior (b), left lateral (c), posterior (d), and occlusal (e) views

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After the photographic protocol, a file with the photos of all the views of the ten skulls and mandibles became available by an online platform for a group of ten participants. The participants were all dentists who work in forensic services as criminal experts or forensic odontologists, and used to work on anthropological analysis. Upon accessing these images, the volunteers proceeded to the analysis of the photographs and fill out an online form, which contained questions about the anthropological profile.

In this form, the participants evaluated questions about ancestry – being able to choose among Caucasian, Negroid, and Mongoloid; sex – being able to choose between male or female; and age – being able to choose among child (up to 11 years), teenager (12–18 years), adult (19–59 years), and elderly (60 years or more). The criteria used for this categorization were based on the report information used at the Center of Legal Medicine to human identification, which had previously been issued for each skeleton.

The forms were answered by each participant according to their individual knowledge of anthropology. After completed by the participants, the forms were sent back to the researcher who compared the anthropological profile established through the visual inspection of the photos with the anthropological profile established in the official report issued by the Laboratory of Forensic Anthropology. If the participant's answer matched the answer that had been issued in the official report, it was considered correct, and if it was different from that of the report, it was considered incorrect. Data were processed using Microsoft Excel® (Microsoft®, USA), and subjected to descriptive statistical analysis.


  Results Top


The evaluation of the results related to the sex determination showed a total correctness of 67.86% in the answer, whereas the incorrect answers totaled 32.14%. Regarding the age estimation, it was possible to detect the highest hit rate, with 88.57% of responses in agreement with the expert's report, and a percentage of only 11.43% of disagreed answers considered incorrect. About ancestry estimation, it was possible to identify the lowest hit rate among the analysis, where 63.57% of the answers were correct and 36.43% of the answers were not successful in estimating this characteristic, being 27.86% of incorrect answers and 8.57% who chose not to respond. The data are observed in [Table 1].
Table l: Results referring to the sex, age, and ancestry estimation

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  Discussion Top


The establishment of the anthropological profile depends on several factors to be considered as the condition of the bone, what elements will be analyzed, what methods will be used, and the examiner's experience and knowledge.[11] In many cases, however, there are no trained professionals in the official expert teams for such profiles to be drawn, so there is a need for viable alternatives to this process.

In Brazil, forensic odontology is categorized as a specialty within odontology, and professionals in this area are able to perform human identification in alive, dead, skeleton, or even fragmented remains. It is up to these professionals the civil, labor, administrative, and criminal inspection.[12] The criminal experts and forensic odontologists act as official government experts to assist the Justice.

With the continuous development of technology, it is increasingly easy to take high-quality photos, which represent the reality with great fidelity and send practically in real time to any part of the world. The use of photographs has already been successful in human identification processes previously, as reported by Terada et al.[13] with the use of smile photographs and Silva et al.,[14] in the analysis of the dental alignment. Miranda et al.,[15] also demonstrated a case using photography for human identification through superimposition, highlighting the incisal outline (canine to canine), in which there was no medical and dental documentation.

Another study about photographs was done for age estimation using smartphone applications but proved not to be such an effective method for estimating age in women.[16] Its use for the anthropological profile establishment is not clear explored, and in this study, we used standard photographs of the skull and mandible in order to verify the possibility for this purpose.

During the establishment of the anthropological profile, the first point to be defined is the sex determination.[17] This due to the influence of sex in the definition of the other topics that make up the profile, since the methods for estimating age and height, for example, are directly related to the fact that the bone is identified as male or female.[18],[19],[20]

The skull has several characteristics of sexual dimorphism that provides substantial information for anthropological analyzes, such as glabella, forehead, mastoid process, styloid process, among others that lead to sex determination. It is also possible to find this type of information in the mandible, using characteristics as robustness, pronation of crests of muscular insertion, and arching of the bone.[21]

In the results obtained through the inspection of the photographs performed by the participants, when addressing the sex characteristic, 67.86% of the responses were correct and the percentage of errors was 32.14%. No studies that involve the attempt to establish an anthropological profile by analyzing photos are available, not even including only sex determination, but the study of Amores-Ampuero, in 2017,[22] when analyzing the dimorphism of the skull taking into account its base and foramen magnum, presented higher accuracy percentages than those found in this study, reaching 75.7%. However, metric methods were used to base its data, which could justify better results since the present study was based only in qualitative analysis.

Another relevant point to be considered is the fact that the pelvis bone, as reported by authors such as Krishan et al., in 2016,[23] and Lesciotto and Doershuk, in 2018,[24] is the primary choice structure in estimating sex because it shows evident reproductive differences. When it is present in the bone remains, such bone structure is the key point in the determination of sex, and therefore, its possible access for analysis in the photographs made available to the participants could increase the index of research success in the definition of sex.

For age estimation, it is possible to act by checking the closure of cranial sutures during bone analysis.[25],[26] The age of an individual tends to grow in proportion to the degree of obliteration of the sutures; only a few suture segments can reach the ages of 70 and 80 years, being helpful in identifying people of advanced age.[27] In the present study, the accuracy index for the age estimation by the analysis of skull and jaw photographs was 88.57%, the most substantial among the characteristics analyzed.

However, the high success rate obtained in the results of this study may be correlated with the range of available age groups in the accessible response sheet for the participants. The choice of the age ranges was justified by what is established by the Child and Adolescent Statute,[28] and the final age group was defined according to the Statute of the Elderly,[29] leaving the “adult” between them. The range of the age groups may have facilitated classification by the participants, thus increasing assertive responses, which would not necessarily indicate a correct analysis of age estimation methods.

Sinthubua et al., in 2016,[30] demonstrated a possible successful correlation between the age estimated by maxillary sutures and the actual age of the individuals. However, in the study by Ruengdit et al., in 2020,[27] it was reported that the use of sutures for age estimation is so erratic in some studies that the fluctuating bias and high inaccuracy make appear to be fairly useless in forensic context. However, this tendency to provide erratic information does not mean that this method is useless. They show a good relationship between suture closure and age with the use of the right sutures in combination within particular age groups. Thus, for the age estimation, it would be ideal to associate more reliable methods with the analysis of the cranial sutures or even with other bones to reduce the eventuality of errors. The using of imaging technology with higher image resolution could provide better details about the suture closure characteristics, being also a possibility to improve this method in future.

For the ancestry evaluation in bones, several characteristics are related to dimorphisms, such as skull length, skull breadth, sagittal contour, zygomatic bones, zygomaticomaxillary suture shape, the shape of the orbits, postbregmatic depression, mandibular ramus breadth, nasal aperture, anterior nasal spine, nasal profile, nasal contour, alveolar prognathism, and the shape of the mandible.[31] Among the results obtained, the ancestry characteristic was the one with the lowest hit rates, totaling 63.57% of correct answers, 27.86% of erroneous answers, and 8.57% of answers left blank.

Iscan and Cotton, in 1985,[32] evaluating the pelvis for ancestry estimation demonstrated a 75% better hit rate when evaluating a single skeletal structure or measure. Concerning skull analysis, Thomas et al., in 2017,[11] obtained an accuracy of around 90.9% and older studies, such as DiBennardo and Taylor, in 1983,[33] also had a higher percentage of success, reaching 96.9%, but these included, in addition to the remaining ones, metric methods which could reinforce the information found and give more support to the estimation of the ancestry, besides carrying out the analysis through the presence of the bones.

A relevant fact to estimate ancestry is that, although extremely important within the anthropological profile, it can be specifically difficult due to the presence of large mixed population in Brazil, where a single skull can present singular characteristics of different ancestry, thus needing a combination of methods and the use of anthroposcopic and anthropometric features for decision-making.[34]

One point to be highlighted in this study is the fact that qualitative methods of analysis were used without the use of quantitative methods for complementation and evaluation of the characteristics, since these were photographs that did not allow success for metrical analysis. Lewis and Garvin, in 2016,[35] described that anthroposcopic evaluation methods have the advantage of being possible to be applied in fragmented bone remnants, do not require special equipment and have the possibility of being implemented in a practical and fast way. Sinhorini et al., in 2019,[36] utilized a quantitative method to estimate sex and affirm the limitation of qualitative parameters when compared to the higher percentage of correct sex classification with the concomitant application of quantitative methods. However, Caple and Stephan, in 2016,[31] analyzed quantitative data and generated new exemplars of skull for ancestry and sex determination using photo-realistic morphotypes and they said that although the quantitative data are very important, they ignore the shape information between designated landmarks and all the color and texture information present in the skull.

It is worth mentioning that no information for comparison was provided to the volunteers, which may have made their analysis difficult. Caple and Stephan[31] demonstrated the importance of graphical illustrations in the establishment of an anthropological profile, where they could standardize anthroposcopic characteristics and specific anatomical variants that would support decision-making and increase the accuracy. Despite this, the intention of the study was not establish specific methods so that participants could choose the ones they were most familiar with in their daily work routines. The choice of specific estimation methodologies may improve results in future studies.

In the forensic field, indexes of correctness are not liable for large margins of error because they are legal or criminal information. According to Lourenço, in 2010,[37] any estimation or diagnosis that is below 80% cannot be accepted, thus other studies would be necessary, testing the association of more methods with the analysis of the photographs or the introduction of new bone structures for an attempt to increase the indexes of correctness in the establishment of the anthropological profile.


  Conclusion Top


After the analysis of the results from this pilot study, it was possible to conclude that the visual inspection of the standard photographs of the skull and mandible for the establishment of anthropological profile presented limited findings, and need to be carefully analyzed and applicable only if the direct examination is not possible.

Acknowledgement

Center of Legal Medicine for the assistance with the collection of my data.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
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