Deslocamentos das cabeças da mandíbula entre as posições de máxima intercuspidação habitual (MIH) e de relação cêntrica (RC) são ocorrências encontradas nas mordidas cruzadas posteriores unilaterais em crianças. Desta forma os mesmos foram estudados em 18 crianças com a referida maloclusão, com media de idade de 7,2 anos para o gênero feminino e 8,4 anos para o gênero masculino. A correção dessa foi efetuada com o aparelho de recobrimento oclusal de acrílico associado ao parafuso hyrax, ajustado à oclusão do paciente de modo a promover contatos bilaterais simultâneos e múltiplos, resultando em algum grau de desprogramação. Os deslocamentos foram medidos nos três planos do espaço por meio do indicador de posição condilar (IPC), antes e após a expansão rápida da maxila com o referido aparelho. Pode-se observar que os deslocamentos condilares entre as posições de RC e MIH, nos planos vertical e horizontal, no tempo pré-expansão, mostraram-se significativamente maiores que os encontrados no tempo pós-expansão, demonstrando assim, diminuição dos mesmos após a correção da maloclusão. No plano transversal não houve diferenças entre os tempos pré e pós-expansão. A comparação entre os lados direito e esquerdo dos deslocamentos estudados no tempo pré-expansão, evidenciou diferenças estatísticamente significantes apenas no plano horizontal (p= 0,039), sendo maiores os deslocamentos do lado esquerdo. No tempo pós-expansão, não se encontraram diferenças estatisticamente significantes entre os lados direito e esquerdo, indicando maior semelhança entre os lados, após a correção das mordidas cruzadas posteriores unilaterais. Os deslocamentos no plano horizontal, de sentido mesial, apresentaram-se em maior porcentagem no lado esquerdo no tempo pré-expansão e no lado direito, no tempo pós-expansão. Os deslocamentos no plano transversal apresentaram maior porcentagem para o lado esquerdo, tanto no tempo pré-expansão, quando a mordida cruzada era deste mesmo lado, como no tempo pós-expansão, quando a mordida cruzada original era do lado oposto. Entretanto, tais prevalências citadas não resultaram em diferenças estatisticamente significantes em nenhum dos sentidos considerados, tanto nos planos horizontal como transversal. As mordidas cruzadas do lado direito foram prevalentes tanto para o gênero feminino como masculino. Após a ERM as cabeças da mandíbula assumiram uma posição mais concêntrica, o que pode favorecer o equilíbrio e desenvolvimento adequados de todo o sistema envolvido. / Changes in the relationship between the condyle and glenoid fossa when the habitual intercuspal position (MHI), to the position of centric relation (CR) events are found in unilateral posterior cross bites in children before treatment of malocclusion installed. Thus condylar displacement between the positions mentioned were studied in 18 children with this malocclusion with a mean of 7.2 years for females and 8.4 years for males. The correction of this device was made with the acrylic coating associated with occlusal screw hyrax, the same being adjusted to the patient\'s occlusion promoting bilateral simultaneous and multiple contacts, resulting in some degree of deprogramming. The displacements were measured in three planes of space through the condylar position indicator before and after rapid maxillary expansion with that instrument. It can be observed that the condylar displacement between the positions of RC and MIH, vertical and horizontal, in the pre-expansion, were significantly higher than those found in the post-expansion, thus demonstrating a decrease of it after correction of malocclusion. In the transverse plane there were no differences between pre-and post-expansion. The comparison between right and left shifts studied in the pre-expansion, showed statistically significant differences only in the horizontal plane (p = 0.039), the greatest displacements side esquerdo.No time post-expansion, there were no statistical differences significant between the left and right sides, indicating a greater similarity between the sides, after correction of cross bites. The displacements in the horizontal plane, the mesial, presented themselves in higher percentage on the left side in the pre-expansion and the right side, in the post-expansion. The displacements in the transverse plane showed a higher percentage to the left side, both in the pre-expansion, when cross-bite was of the same side as in the post-expansion, when the original cross-bite was on the opposite side. Prevalences were not identified statistically significant shifts in the way of mesial and distal in the horizontal plane, or left and right in the transverse plane, both in pre and post-expansion, regardless of which side of the crossbite. The cross bite on the right were so prevalent for females as males. After the ERM heads jaw took on a more concentric position, favoring a balanced and proper development of the entire system involved.

Variation in the shape and position of the internal nasal floor relative to the lower border of the piriform aperture in the genus Homo has been described as having three primary shape configurations: level, sloped, or depressed. The high frequency of depressed nasal floors among Neandertals relative to other fossil and extant groups (>80%) had originally led to the idea that nasal floor depression was related to an overall enlarged nasal capsule - an adaptive feature that would have been under selection among Neandertals living in cold, glacial climates. For a variety of reasons, subsequent research has found little empirical or theoretical support for this adaptive idea. Recent research on extant humans has also demonstrated that nasal floor shape variation, unlike many other midfacial traits, does not arise until well after birth, with nasal floor depression (when it occurs) appearing at the earliest around 3.0 years of age. Furthermore, nasal floor depression was also shown to correspond with a vertically expanded premaxillary region. Thus, it was hypothesized that nasal floor depression might be related to variation in key developmental and morphological aspects of the anterior maxillary dentition. This study metrically quantifies nasal floor topography for the first time in order to more objectively examine patterns of shape variation and to test explicit hypotheses regarding potential causative factors for nasal floor variation. The variables examined include anterior tooth dimensions, dental developmental rate, aspects of midfacial shape, overall facial size, and patterns of premaxillary/post-maxillary integration. It was found that among these, only dental developmental rate was clearly correlated with internal nasal floor shape. This result indicates that aspects of anterior dental development may indeed be a causative factor in the development of nasal floor shape variation. The existing visual discrete coding system for nasal floor topography was also evaluated in light of the new, quantitative data produced by this study as well as a critical comparison of the consistency of nasal floor topography definitions used previously in the literature. While it is suggested that quantitative data are preferable to qualitative data for this trait when possible, limitations in research methods for collecting quantitative data on osteological and fossil collections remain difficult to overcome. Thus a new, two-category presence/absence based system for describing nasal floor shape is proposed.

Successful stock enhancement of hatchery-reared fish depends heavily on the release of individuals able to demonstrate strong survival skills. Overall survival of fishes is a reflection of a successful blend of physiology, anatomy, and behavior. With fishes being highly phenotypically plastic, the potential exists for all aspects of hatcheryreared fish to vary significantly from their wild counterparts while having potentially adverse effects on their survival after release. Previous analyses have demonstrated significant differences between the feeding behavior of hatchery-reared and wild caught largemouth bass (Micropterus floridanus) in the laboratory, as well as differences in the development of the skull between these two groups. The aim of this study was to determine if oral and pharyngeal jaw dentition differed between hatchery and wild bass. Scanning electron micrographs of the oral and pharyngeal jaws from an overlapping size range of 30 hatchery-reared and 30 wild bass were compared for the number and characteristics of oral and pharyngeal teeth. Wild bass were found to have features which would presumably allow more efficient capture of prey. The results of the study suggested that wild bass exhibited greater number of teeth when compared to hatchery reared bass. They also exhibited oral and pharyngeal teeth which were greater in length, and pharyngeal teeth that were greater in width when compared to hatchery-reared bass. This deficiency in dentition could have a significant effect on prey-capture success when introduced into the wild. We suggest that exposure to wild prey during the grow-out phase of aquaculture could provide the necessary adaptive plasticity of hatchery-reared bass dentition

Thesis (doctoral)--Justus-Liebig-Universität Giessen, 1984. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 199-208).

Thesis (doctoral)--Justus-Liebig-Universität Giessen, 1984. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 199-208).

This thesis investigates infant and childhood health in the Roman period (1st to 4th centuries A.D.) cemetery at Vagnari using data on the prevalence and timing of linear enamel hypoplasias (LEH‘s). These results are examined in the context of historical and archaeological evidence for childhood health in ancient Rome. Analysis of the prevalence of LEH‘s in 48 individuals reveals a low frequency (64.6 %) of enamel hypoplasias in comparison with other Roman period skeletal samples, suggesting that political–economic or geographical variables may have contributed to the generally healthy conditions for subadults at Vagnari. Intrasite analysis indicates no significant difference between sexes or burial types with respect to the average number of teeth affected with hypoplasias and the average total number of defects, but a significant difference does exist between age groups (divided into 15 year intervals). The hypoplastic data indicate that males and females were experiencing similar levels of stress during infancy and childhood. These results are not consistent with the historical evidence, which suggests that male children were preferentially treated in ancient Roman society. Measurement of each hypoplastic defect indicates a peak age at occurrence of 2.75 years of age, which is interpreted as evidence of the end of the weaning process. Enamel hypoplasias occurred until around 6.5 years of age, suggesting that these Roman children experienced stress throughout childhood, possibly the result of childhood illness or malnutrition. The hypoplastic data are consistent with the historical evidence from the Roman period with respect to the general timetable of weaning. This research integrates biological, archaeological, and historical information about the lives of children to help investigate the physical well–being of a rural working class population in the ancient Roman Empire.

A gap in the literature exists regarding the chemical effects of household acids at different concentrations on restored and non-restored dentition. The present study examines the effects of household corrosive products on human dentition. A total of 105 adult teeth consisting of restorations composed of silver amalgam, porcelain-fused-to-metal crowns, and teeth lacking restorative material were used. The household products utilized were hydrochloric acid (Clorox® Bleach Cleaner and The Works® Toilet Bowl Cleaner) and sulfuric acid (Drano® Drain Opener and Watchdog® Battery Acid), along with one control base (Biz® Detergent). Teeth were radiographed before and after exposure to the products and were removed from the solutions after 1, 2, 4, 8, 24, 72, 120 and 264 hours. Documentation included weight, mesiodistal and buccolingual crown measurements, ordinal scoring of alterations, and photography. The results indicate 86% of the teeth could be positively identified by radiographs after exposure. Hydrochloric acid had the most destructive effects to teeth without restorations and those with silver amalgam restorations but had a minimal effect on the porcelain-fused-to-metal samples. Sulfuric acid minimally altered the restored teeth and deteriorated some parts of the enamel and dentin of the non-restored samples. Exposure to the detergent resulted in no change. A logistic regression analysis was conducted to determine if there was statistical relevance in acid type, acid concentration, and the type of restoration of the tooth. Results indicate that acid type, acid concentration and the type of restoration are all statistically relevant for positively identifying an individual through radiographs. The results of this study demonstrate that various household corrosive substances can affect the morphology of teeth, and in some cases, destroy teeth, which could mask the identification of an individual. However, the porcelain-fused-to-metal crowns were minimally affected by corrosive agents and can therefore be used for positive identifications.

Orientador: Célio Percinoto / Resumo: É alta a incidência de traumatismos dentários principalmente nas crianças e nos adolescentes, sendo freqüente a ocorrência de complicações em decorrência destes traumas. Assim, realizou-se um estudo clínico e radiográfico de dentes anteriores decíduos e permane ntes traumatizados e também de dentes sucessores a decíduos traumatizados de crianças atendidas na Faculdade de Odontologia de Araçatuba - UNESP e na Fundação Educacional de Barretos - FEB, analisando a ocorrência de seqüelas e os fatores relacionados. For am analisados 333 dentes decíduos, 212 permanentes e 264 sucessores permanentes, os dados registrados em fichas apropriadas e, posteriormente, submetidos à análise estatística. As complicações mais comuns em decorrência de traumatismos na dentição decídua foram a alteração de cor da coroa e a reabsorção radicular patológica. Na dentição permanente foram a fratura coronária e a alteração periapical. As associações de traumatismos (fratura + luxação) foram as maiores responsáveis pela condição de necrose pulp ar tanto na dentição decídua quanto na permanente. A proteção labial do paciente não influenciou na ocorrência de traumatismos, porém o overjet do paciente apresentou influência sobre a dentição permanente. A procura por atendimento imediato foi mais baixa quando do traumatismo acometendo a dentição decídua, com diferença estatisticamente significativa. A freqüência de distúrbios de desenvolvimento observada nos permanentes sucessores foi de 45,8%, sendo a hipomineralização do esmalte a seqüela mais encontr ada, a luxação do tipo intrusiva a que causou mais distúrbios e as faixas etárias mais baixas foram as mais relacionadas com a presença de seqüelas. Houve também uma relação entre a freqüência de hipomineralização do esmalte e a condição pulpar do dente de cíduo traumatizado. / Abstract: It is high the incidence of dental traumatisms mainly in children and in adolescents, being frequent the occurrence of complications due to these traumas. Thus, was carried out a clinical and radiographic study of deciduous and permanent anterior teeth traumatized and also of teeth successors the deciduous traumatized of children assisted at School of Dentistry at Araçatuba - UNESP and at the School of Dentistry of Barretos - FEB, analyzing the occurrence of sequelae and the related factors. 333 deciduous teeth were analyzed, 212 permanent and 264 permanent successors, the data registered in appropriate records and, later, they were submitted to statistical analysis. The most common complications due to traumatisms in the deciduous teething were the alteration of color of the crown and the pathological root resorption. In the permanent dentition the complications were the coronary fracture and the alteration periapical. The associations of traumatisms (fractures + luxation) were the most responsible for the condition of pulpal necrosis in the primary dentition as in the permanent. The patient's labial protection does not seem to influence in the occurrence of traumatisms, however the patient's overjet presented influence on the permanent dentition. The search for immediate service it was lower when the traumatism occurs in the primary dentition, with statistically sig nificant difference. The frequency of development disturbances observed in the permanent successors was 45,8%, being the hypomineralização of the enamel the sequelae mostly found, the dislocation of the intrusive type the one that caused more disturbances and the lowest age groups were the most related with the presence of sequelae. Additionally, there seems to exist a relationship between the frequency of hipomineralização of the enamel and the pulpal condition of the traumatized deciduous tooth. / Doutor

Magister Scientiae Dentium - MSc(Dent) (Community Oral Health) / The aim of this study was to establish whether there is any association between developing maxillary canine ectopia and various other dental anomalies using panoramic radiographs in the mixed dentition stage of development.

OBJETIVOS: Avaliar a associação entre aleitamento materno e ocorrência de distoclusão em crianças com dentição decídua. MÉTODOS: Estudo transversal aninhado a uma coorte conduzido no Brasil, envolvendo 153 crianças. Os dados relativos à dieta e hábitos de sucção foram coletados (por um examinador cego para a exposição) aos 7, 30, 60, 120 e 180 dias e na época da avaliação odontológica realizada quando as crianças tinham entre 3 e 5 anos de idade. A regressão de Poisson foi utilizada para testar a associação entre o desfecho (presença de distoclusão) e a prática do aleitamento materno. RESULTADOS: A prevalência de distoclusão foi 47,7%. A análise multivariada mostrou ser o aleitamento materno um fator de proteção contra distoclusão após ajuste para uso de chupeta e mamadeira. As crianças amamentadas por 12 meses ou mais tiveram uma probabilidade 56% menor de apresentar distoclusão aos 3-5 anos, quando comparadas com aquelas amamentadas por menos tempo RP= 0,44; IC 95% 0,23; 0,82). CONCLUSÃO: O aleitamento materno mantido por 12 meses ou mais reduz significativamente a prevalência de distoclusão na dentição decídua. / OBJECTIVE: To evaluate the association between breastfeeding and the occurrence of distocclusion in children with deciduous dentition. METHODS: Nested cross-sectional study of a contemporary cohort conducted in Brazil, involving 153 children. Data on diet and sucking habits were collected (by an examiner blind to the exposure) at 7, 30, 60, 120 and 180 days and at the time of dental evaluation conducted when the children were between 3 and 5 years of age. The Poisson regression was used to test the association between the outcome (presence of distocclusion) and the practice of breastfeeding. RESULTS: Prevalence of distocclusion was 47.7%. Multivariate analysis showed that breastfeeding was a protective factor against distocclusion after control for pacifier use and bottle feeding. Children breastfed for 12 months or more had a probability 56% lower of presenting distocclusion at 3-5 years compared with those breastfed for less time (RP = 0,44, 95% IC 0,23, 0,82). CONCLUSION: Continued breastfeeding for 12 months or more reduces significantly the prevalence of developing distocclusion in primary dentition.