Prevalência de dois canais em incisivos inferiores permanentes humanos

Introducao e objetivo: O sucesso do tratamento endodontico requer um amplo conhecimento da anatomia do dente e de suas variacoes. Assim, o presente estudo teve como objetivo avaliar atraves das imagens radiograficas a prevalencia de dois canais em incisivos inferiores permanentes humanos, determinando com isso o local de uniao desses canais. Material e metodos: Utilizou-se 100 dentes incisivos inferiores permanentes humanos. Inicialmente, em cada dente obteve-se um corte transversal na juncao cemento-esmalte, logo apos, realizou-se avaliacao radiografica em todos os dentes, visando identificar a presenca ou nao de dois canais. Posteriormente, identificou-se o local de bifurcacao dos dentes com dois canais, atraves de radiografias. Resultado: Observou-se no exame radiografico que 28% dos especimes (28 dentes) examinados possuiam dois canais. Destes, 85,7% dos especimes (23 dentes) apresentaram canais com uniao no terco apical, 7,1% dos especimes (3 dentes) tinham canais independentes, 3,6% dos especimes (1 dente) possuiam canais com uniao no terco medio e nenhum apresentava uniao dos canais no terco cervical. Em um dos dentes estudados (3,6%), nao foi possivel fazer essa avaliacao. Conclusao: Conclui-se que a prevalencia de dois canais em incisivos inferiores permanentes humanos foi de 28% dos especimes, sendo que o principal local de uniao e o terco apical (85,7%).(AU) Introduction and Objective: The success of endodontic treatment requires a comprehensive knowledge of tooth anatomy and its variations. So, this study aimed to evaluate the prevalence of two root canals in human permanent lower incisors, determining the place of union of these root canals. Materials and methods: A hundred human mandibular incisors were used. First, a cement-enamel cross section was obtained in each tooth, after that radiographic evaluation was performed in all the teeth in order to identify the presence or not of two root canals. Subsequently, the location of the bifurcation of two root canals teeth was identified through radiography. Results: It was observed through radiographic examination that 28% of the specimens (28 teeth) examined had two root canals. 85.7% of these specimens (23 teeth) presented union in the apical third, 7.1% of the specimens (3 teeth) had independent canals, 3.6% of the specimens (1 tooth) had canals with the union in the third medium and none of them presented union in the cervical third. In one of the teeth studied (3.6%), it was not possible to make this assessment. Conclusion: It was concluded that the prevalence of two root canal in human permanent lower incisors was of 28%, and that most unions occurred is the apical third (85.7%).(AU)