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
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2015-03-13
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Universidade Federal de Goiás
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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.
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RABELO, Luiz Eduardo Gregoris. 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. 2015. 68 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2015.