Utilização de estratégia dinâmica de navegação em imagens axiais de tomografia computadorizada de feixe cônico na detecção da frequência de istmo radicular na dentição permanente humana

• Ano de defesa: 2015
• Autor(a) principal: Rabelo, Luiz Eduardo Gregoris
• Orientador(a): Estrela, Carlos
• Banca de defesa: Estrela, Carlos, Pécora, Jesus Djaalma, Souza, João Batista, Alencar, Ana Helena de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Odontologia (FO)
• Departamento: Faculdade de Odontologia - FO (RG)
• País: Brasil
• Palavras-chave em Português: Tomografia computadorizada de feixe cônico; Canal radicular; Anatomia; Endodontia
• Palavras-chave em Inglês: Computed tomography cone beam; Root canal; Anatomy; Endodontics
• Área do conhecimento CNPq: ODONTOLOGIA::CLINICA ODONTOLOGICA
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/9864

This study determined the frequency of root isthmuses (RI) in human permanent teeth using map-reading dynamics and cone beam computed tomography (CBCT) images. A sample of 1,400 teeth was selected from CBCT scans of 618 patients (394 women; 43.4 mean age-years). RI were detected longitudinally using map-reading dynamics on axial images by CBCT using slices with a 0,1 mm thick, from the pulp orifice to the root apex, and findings were recorded into seven categories: 1. beginning and end in cervical third; 2. beginning in cervical third and end in middle third; 3. beginning in cervical third and end in apical third; 4. beginning and end in middle third; 5. begin in middle third and end in apical third; 6. beginning and end in apical third; 7. no isthmus. The categorical variables, described as frequencies (%), were analyzed using a chi-square test (2) with Yates correction or the Fisher's exact test. Quantitative variables were compared using the Student t test for independent samples. RI is an anatomic structure of common occurrence in human permanent teeth, except in maxillary anterior teeth. The higher frequencies of root isthmus (87.9%) in human permanent teeth were found in mandibular first molars. The frequency of RI according to gender was not significantly different (p>0.05), except in mandibular central incisors. RI was less frequent among older patients. The higher frequency of four root canals (76%) and four apical foramina (33%) was found in maxillary first molars.