Browsing by Author "Pereira, Cristiana Palmela"
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- Age estimation in Portuguese population: The application of the London atlas of tooth development and eruptionPublication . Pavlović, Strahinja; Pereira, Cristiana Palmela; Santos, Rui Filipe Vargas de SousaChronological age estimation from the dental parameters is becoming increasingly important. The London atlas of tooth developmentis the most recent developed method and represents a modification of the previous older methods. The aim of this study was to evaluate the accuracy of the London atlas for the dental age estimation in the Portuguese population. The study sample included 736 radiographic images (498 females and 238 males) of Portuguese origin, patients of Dental Clinic of Superior Institute of Health Sciences Egas Moniz and Dental Medicine Faculty, University of Lisbon. The age range of the individuals was between 3 and 24 years. Estimated age was compared with the chronological age using the paired t-test. The results showed that there was no statistically significant difference between left and right side of the jaw (p > 0.05). Both sides showed an average overestimation of age by one month approximately. Moreover, the significant difference between chronological and estimated age was not observed in the females. However, the significant difference was observed in a sample coming from males (right: p = 0.008; left: p = 0.003). Our results showed that the London atlas can be potentially used as a tool for age estimation. However, the difference between sexes clearly suggests that separate charts should be made for each sex. Further studies, which will have as a final goal the development of a new method for age estimation using dental parameters, are needed.
- Commingled and disarticulated human remains related to 1755 Lisbon earthquake: Height estimation from incomplete and complete femoral bonesPublication . Matos, Sofia; Flamino, Carolina Barroso; Borges, Guilherme; Francisco, Inês; Tropa, Madalena; Cruz, Tiago; Bento, Beatriz; Santos, Rui; Pereira, Cristiana PalmelaIntroduction: In Forensic Medicine, the estimation of the stature often has a crucial role in the reconstruction phase of disjointed populations. The femur, being the longest bone in the human body, is usually the most reliable source in height estimation. However, in these populations, intact femurs are hardly ever found, making it necessary to use femur fragments for the same purpose. Aim: This investigation aims to estimate the stature of the catastrophic population concerning the earthquake that occurred in Lisbon, in 1755. Materials and Methods: The study was conducted on 8 whole femurs and 21 fragments, which were measured and weighted. These measurements were applied in a regression formula, obtained from the gathered research, in order to estimate the stature of the population. Results: The results showed that, for the whole femur, the corresponding height varies between 147.96 cm and 168.82 cm. For the fragments, the obtained estimates vary between 151.96 cm and 174.96 cm. Conclusion: The methods used proved to be reliable in estimating the length of the femur, as well as in deducting the height of individuals through this bone, allowing the study of these parameter's evolution in generations.
- Osteometric and osteomorphological sex estimation from the Os Coxa in an archaelogical population related to the 1755 earthquake of LisbonPublication . Flamino, Carolina Barroso; Oliveira, Daniel; Ferreira, Leonor; Martins, Matilde; Santos, Renata; Laureano, Rita; Nunes, Tânia; Bento, Beatriz; Santos, Rui; Pereira, Cristiana PalmelaIntroduction: The ability to determine sex from unknown skeletal remains vital, and methods to do it on various bones of the human skeleton have been researched extensively. The present work consists in the analysis of coxal bones belonging to the victims of the 1755 Lisbon's Earthquake. Aims: This project aims the characterization of the population whose skeletal remains were found in the Cloister's South Wing of Academia das Ciencias de Lisboa in 2004. Materials and Methods: In order to achieve the final objective, six measurements were taken, in anatomic position, and seven indices were calculated. Furthermore, morphological characteristics were observed through four different methods. These procedures were applied to a total number of 129 coxal bones. Results: From measurements and indices, the best results found were 16 females and 5 males, but the overall results were not reliable, since there was no consensus between the different measurements and so the majority of the coxal bone were classified as ambiguous. However, the Phenice's Method in the study of the coxal morphology showed to be very specific-through this procedure 18 females and 9 males were estimated. Conclusions: It was noticed that the measurements and the calculation of indices are less reliable than the morphological observations. Moreover, Phenice's Method seemed to be the most precise, once it evaluates three parameters simultaneously, instead of just one, allowing to obtain more accurate results for sexual discrimination.
- Validation of Cameriere's medical-legal age estimation method using seconds premolars in a Portuguese populationPublication . Anastácio, Ana Catarina; Serras, Cristina; Santos, Rui; Pereira, Cristiana PalmelaThe goal of this project is to validate the Cameriere's method applied to the upper and lower second premolars in a Portuguese population, regarding the forensic estimate of age. The applied sample consisted in 100 panoramic radiographs, of 60 males and 40 females, patients of the Faculty of Dental Medicine of the University of Lisbon, whose ages vary between 15 and 35 years old. Thus, a total of 400 teeth were investigated (200 upper second premolars and 200 lower second premolars). Each radiograph was analysed using draw and measurement tools featured in Adobe Photoshop, applying the Cameriere's method, and then the pulp/tooth ratio was computed for the 15, 25, 35 and 45 teeth. All data were statistically analysed with the SPSS program, using a significant level of 5%. It was not observed any kind of relation, linear or not linear, between age and the pulp/tooth ratio. Linear regressions with considerably low values for the coefficient of determination were achieved, which indicates a low reliability for these models. Accordingly, we conclude that the knowledge of the pulp/tooth ratio does not allow the identification of an individual based on the Cameriere's method, in the scope of a forensic age estimate applied to panoramic radiograph. Further investigations with larger samples and broader age groups are required in order to provide suitable evidence to the legal and social aspects of age estimate in Forensic Dentistry.