Thesis (Ph. D.)--Arizona State University, 1977. / Vita. Includes bibliographical references (leaves [321]-359).

Age assessment which is an integral part of forensic and clinical practice when assessed using the extent of dental development has proven to be more accurate than other methods. Variations in dental development have necessitated the construction of ethnic specific reference datasets (RDS) to ensure accurate age assessments. Age estimated from ethnically different RDS in southern Chinese subjects has been shown to be inaccurate. A systematic review and meta-analysis from the most commonly used French-Canadian dataset revealed consistent over-estimations of age of global population groups, inferring the need for population specific RDS. A study which compared a group of 400 five years old children born in the 1980s and the 2000s demonstrated that children born in recent decades have more advanced dental development. Hence, only the most recent samples were included in the construction of a RDS for southern Chinese using dental panoramic radiographs of 2306 subjects. The reference dataset was subsequently validated on 484 subjects of southern Chinese origin by conducting dental age assessments (DAA) using un-weighted and weighted methods of dental age calculations. Paired t-test demonstrated that all methods of assessments were able to accurately estimate the age (p>0.05). The overall age differences ranged from -0.01 to 0.11 years for males and -0.03 to 0.10 years for females respectively. In addition, to test the accuracy of different ethnic datasets, 266 southern Chinese subjects for whom age had been estimated using the UK Caucasian and French-Canadian datasets were re-scored using the southern Chinese RDS. The latter was able to estimate the age of 80% of the subjects within a range of 12 months and the importance of population specific reference standards was elucidated. The validated southern Chinese RDS on dental development can thus be used to estimate the age of children and young adults of southern Chinese origin. This RDS was also tested for applicability on the records of 953 subject obtained from Japan, Thailand and Philippines. A similar method of validation was conducted and the southern Chinese RDS estimated the age of Thai males, Filipino and Japanese subjects with a reasonable degree of accuracy. The genetic similarity between the southern Han Chinese and the other East Asian population groups may account for the obtained accuracy. The secular trend study was the first of its kind study in Asia that demonstrated advanced dental maturation in children born in recent decades. Natural calamities that strike East Asia leave thousands of people missing. In those circumstances, dental age assessment using the southern Chinese RDS would help in the process of identifying deceased victims. Furthermore, only half of the children in the world below the age of five years are registered; thus the need for determining age is of foremost importance to safeguard them against age specific crimes. Methods of establishing reference datasets and conducting accurate age assessments that have been investigated and tested in this study indicate that the methodology can be applied to any ethnic population group in the world. / published_or_final_version / Paediatric Dentistry / Doctoral / Doctor of Philosophy

Thesis (Ph.D.) -- McMaster University, 1999. / Includes bibliographical references (leaves 189-204). Also available via World Wide Web.

xvi, 247 leaves : ill., maps, tables ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.1977) from the Dept. of Oral Biology, University of Adelaide

Thesis (doctoral)--Universität München, 1974.

Thesis (doctoral)--Universität München, 1974.

Thesis (Ph. D.)--Ohio State University, 2005. / Title from first page of PDF file. Document formatted into pages; contains xii, 165 p.; also includes graphics Includes bibliographical references (p. 135-148). Available online via OhioLINK's ETD Center

No description available.

In 2013, Mississippi State University recovered 67 individuals from the Mississippi State Asylum Cemetery (1855-1935) in Jackson, Mississippi. The first goal of this research was to investigate heterogeneous frailty and varying life histories between MSA skeletal demographic groups. The second goal was to contextualize the MSA skeletal data via comparisons of MSA oral pathology and mortality data to other contemporaneous institutional skeletal samples in the U.S. as well as non-institutional skeletal samples in the southern U.S. Oral pathology data included linear enamel hypoplasias, caries, and antemortem tooth loss and demographic data included age and sex estimations. Results did not reveal any significant differences in oral health or mortality within the MSA sample. Additionally, the comparison of institutional samples exhibited generally similar prevalence of oral pathologies, but the MSA sample exhibited fewer individuals with oral pathologies and higher life expectancy than non-institutional comparative samples.

The aim of this study was to compare the size of the teeth of a sample of small-bodied fossil humans from the island of Palau, Micronesia, with modern and fossil human populations from mainland southern Africa. Four modern human population groups and a sample of Holocene human remains were examined for comparison. These included Zulus, Tswanas, Khoisan and Europeans, from the Dart Collection, University of the Witwatersrand. Several measurements of the different tooth classes were obtained from the modern population groups and compared to the Palauan sample using Univariate and Bivariate statistical methods. In addition, frequencies of anomalies were recorded for the entire modern human Dart Collection (n. 3000), and a sample of Holocene human skeletons (n. 69) for comparison with the Palauan material. The Palauans have been found to have absolutely and relatively very large teeth compared to modern and Holocene population groups. Their mesiodistal diameter (MD) and buccolingual diameter (BL) exceed the normal range of modern human populations, whereas the same measurements at the cervical enamel junction are smaller. Total root length and crown height of the Palauans are equal to those of modern humans. Estimating body size from tooth size is thus shown to be unreliable, indicating that tooth size should be viewed in relation to other factors, such as diet, which may lead to phenomena like island dwarfism. Frequencies of third molar agenesis, incisiform canines, caniniform premolars and rotated premolars were very high in the Palauan sample: third molar agenesis, incisiform canines, caniniform premolars and rotated premolars. These anomalies are mostly due to crowding, which results in erupting teeth looking like their neighbours, or failing to develop at all, as in the case of third molars, which free up space for the remaining teeth to develop.