Efeitos imediatos da expansão rápida da maxila na altura e espessura alveolar, com os disjuntores tipo Haas e Hyrax, em tomografias

• Ano de defesa: 2011
• Autor(a) principal: Bernd, Guilherme Picolli
• Orientador(a): Menezes, Luciane Macedo de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Pontifícia Universidade Católica do Rio Grande do Sul; Porto Alegre
• Palavras-chave em Português: ODONTOLOGIA; ORTODONTIA; TÉCNICA DE EXPANSÃO PALATINA; TOMOGRAFIA COMPUTADORIZADA; PERDA ÓSSEA ALVEOLAR; PERIODONTIA
• Link de acesso: http://hdl.handle.net/10923/384

Introduction: The purpose of this study was to evaluate the immediate effects of the rapid maxillary expansion (RME) on the bone thickness and level of maxillary first molars, comparing the tooth-tissue-borne and tooth-borne expanders, in CBCT. Methodology: Two methodologies for periodontal evaluation were tested, one positioning the tomographic cut parallel to the palatal plane (A), and another positioning the cut parallel to the long axis of the dental root (B). After determining the best methodology, it was applied. The sample comprised of 66 CBCT exams (before expansion and immediate after expansion) from 33 patients. Multiplanar reconstruction was used to measure the following changes: buccal marginal bone level and thickness, interdental distance and intermolar angle. The Wilcoxon test and a mixed analysis of variance (ANOVA) model with alleatory effect to patients at a significance level of 5% were performed. Results: A mean reduction of 0,39 mm was observed on buccal bone thickness and a reduction of the buccal bone level of 0,55 mm was found as immediate effects after RME. Conclusions: The B methodology showed more reliable results for measuring the effects of RME on the buccal bone. The immediate effects of RME showed reduction of the buccal bone level and thickness of maxillary molars in both groups; the tooth-tissue-borne expander produced greater buccal crown tipping than did the tooth-borne expander; the intermolar distances increased in both groups, but the intermolar distance at the furcation level had a greater increase in the tooth-bourne group.