Thesis (M.D.S.)--University of Adelaide, Dept. of Restorative Dentistry, 1979.

Made available in DSpace on 2014-06-11T19:33:23Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-07-26Bitstream added on 2014-06-13T19:44:08Z : No. of bitstreams: 1 lara_ts_dr_araca.pdf: 1227038 bytes, checksum: 5bdeade52ce118fe9dec19c954916edd (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Introdução: O objetivo do presente estudo clínico foi avaliar as dimensões transversais do arco dentário inferior com o uso da placa lábio-ativa aberta e fixa associada à extensão lingual de canino decíduo a primeiro molar permanente. Métodos: A amostra constou de 14 pacientes no estágio de dentadura mista e com idade média de oito anos e seis meses. Todos os pacientes realizaram expansão rápida da maxila e expansão lenta do arco inferior com a placa lábio-ativa. Modelos de gesso foram obtidos nas fases de pré-tratamento e pós-tratamento e digitalizados com auxílio do scanner 3Shape R700 3D (3Shape A/S, Copenhagen, Dinamarca). Medições transversais foram realizadas para as distâncias entre as pontas de cúspide dos caninos decíduos, pontas de cúspide mesiovestibulares dos molares decíduos e primeiro molar permanente e pontos médio cervical da face vestibular. O teste t foi utilizado para determinar se o aumento nas larguras transversais foi significativo. Resultados: Observou-se um aumento transversal estatisticamente significativo (p<0,05) que variou de 4,11mm a 4,51mm nos referenciais utilizados no nível das pontas de cúspide. Conclusão: A placa lábio-ativa aberta e fixa apresentou um efeito transversal significativo em aproximadamente seis meses de tratamento / Introduction: The aim of the current clinical study was to evaluate the transverse dimensions of the lower dental arch with the use of the fixed and expanded lip bumper associated to the lingual extension from the deciduous canine to the permanent first molar. Methods: The sample was comprised of 14 patients in the mixed dentition with a mean age of 8 years 6 months. All patients were submitted to rapid palatal expansion and dentolaveolar expansion of the lower dental arch with a lip bumper. Pre-teatment and post-treatment cast models were obtained and digitized with the 3Shape R700 3D (3Shape A/S, Copenhagen, Denmark) scanner. Transverse distances between the cusp tips of the canines, the mesial buccal cusps of the deciduous molars and of the permanent first molars and between the cervical middle points of the buccal aspects of these teeth were measured. The t tests were performed to determine whether an increase in transverse distances was significant. Results: A statistically significant transverse increase (p<0,05) ranging from 4.11 mm to 4.51 mm was observed in the cusp tips. Conclusion: The fixed and expanded lip bumper presented a significant transverse effect within approximately 6 months of treatment

Indiana University-Purdue University Indianapolis (IUPUI) / The purpose of this study was to compare the maxillary dental arch form and palatal vault form between 98 cerebral palsied and 76 normal children. All subjects were divided into three categories based on their dental eruption. The cerebral palsy subjects were further divided into the regional classifications of diplegia, paraplegia, hemiplegia, and quadriplegia, and the descriptive classifications of spasticity, athetosis, and mixed. The maxillary dental arch form was described by an index number which reflected intercuspid width, intermolar width, anterior-posterior length, and degree of divergence of the posterior segments. The palatal vault form v1as described by the angle of divergence of the palatal walls at an established reference point from a cross-sectional view. All measurements were made from study models and Xerox photocopies of study model cross-sections. In addition, those occlusal discrepancies that were thought to influence arch form, i.e., posterior unilateral and bilateral crossbite, anterior crossbite, anterior open bite, and posterior dental asymmetry were tabulated. Statistical analysis of the results revealed no significant difference in maxillary dental arch form between the cerebral palsied and normal children. The same held true for palatal vault form. Significant differences did occur between primary, mixed, and permanent dentitions for both cerebral palsied and non-handicapped groups. The results suggest that the neuromuscular handicap has little effect on the form of the maxillary dental arch. On the basis of this study, it appears that there is no particular type of maxillary arch form that is peculiar to cerebral palsy.

Indiana University-Purdue University Indianapolis (IUPUI) / The programs developed in this study are examples of how a personal computer can aid the delivery of dental care. The versatility of the computer depends on the availability of a variety of programs specifically developed for dentistry, without which computers will have little impact on treatment. Moyers' analysis adapted for the Apple II and its research modification are computer programs developed specifically for dentistry. Accurately predicting the mesiodistal widths of the unerupted permanent canines and premolars in the mixed dentition can lead to orthodontic treatment that is optimally timed, with desirable facial and dental results. The stage of the mixed dentition constitutes the most intricate period in the development of the occlusion; any small anomaly occurring in this stage can pose complicated problems for the permanent dentition, requiring a more extensive and expensive mechanotherapy. Malocclusion is a developmental problem. Analysis of dental crowding and its relationship to tooth size and arch dimensions yielded the following results for the maxillary and mandibular arches: 1. Statistically different values for tooth size were noted between crowded and noncrowded groups, with crowded individuals having larger teeth. 2. Arch perimeter and arch depth were significantly smaller in crowded groups than noncrowded groups. 3. No significant differences were noted between crowded and noncrowded groups in arch width or symmetry. 4. Significant differences were demonstrated in the eccentricity value of an ellipse for crowded and noncrowded cases. This study suggests that dental crowding is associated with both small dental arches and large teeth. Therefore, greater consideration may be given to those treatment techniques which increase dental arch width, length, and perimeter. This is especially relevant in younger patients whose dentitions are in the deciduous and mixed stages of development. Further investigation into the relationship of dental crowding and arch shape with a larger sample might be productive. The eccentricity of a curve should be used to evaluate pre and post orthodontic treatment. Modifications to the basic computer program could include prediction values for Black Americans, cephalometric value interpretation, and the Bolton and Ponts analysis as a comprehensive diagnostic computer package.

Indiana University-Purdue University Indianapolis (IUPUI) / A study was made comparing Japanese and Caucasian American Class II, Div. 1 malocclusions with respect to maxillary arch form and dento-skeletal patterns. For the arch form study, the maxillary casts of twenty Caucasian and eighteen Japanese individuals of comparable ages were evaluated. Dental arch indices were calculated for each individual and the mean values of the two groups were tested for significant difference. The Caucasian arches exhibited a more narrow tapering form than did the Japanese. In the second part of the study, eighteen Japanese and eighteen Caucasian American Class II, Div. 1 malocclusions were evaluated for differences in dento-facial architecture. Downs' radiographic cephalometric analytical procedure was used. Mental prominence was also measured using a technic which was described. It was found that the facial plan angle and mandibular plane angle in the Japanese group was more obtuse. The mental prominence in the Caucasian group was larger than in the Japanese group.

Thesis (M.S.)--University of Michigan, 1984.

Thesis (M.S.)--University of Michigan, 1961.

Thesis (doctoral)--Münster, 1934. / Includes bibliographical references (p. 47-51).

Thesis (M.S.)--University of Michigan, 1984.

Thesis (M.S.)--University of Michigan, 1961.