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The success of endodontic treatment is the result of a series of technical steps that range from the correct selection of the case to be treated to the obturation of the canal, however anatomical knowledge is essential for a promising start of this treatment. The aim of this study was to analyze, through tomographic images, the internal anatomy of the second upper premolar of human teeth. The endodontic anatomy of 280 upper premolar seconds was assessed using tomographic examinations. The images were evaluated the number and shape of the channels in cervical, middle and apical thirds. 48.2% ended in a single root canal, while 51.8% premolars ended with two root canal. Only 41.4% had the same number of channels from the beginning to the end of the route, 23.9% with one channel and 17.5% with two channels. Regarding the transverse shape of the root canals, among the 280 teeth, 194 had a canal in the cervical third, and of these, 98.4% were flattened and 1.6% were circular, while 86 teeth had 2 channels in this region, being 30.2% flat and 69.8% circular. Based on the methodology used, it was concluded that 48.2% of the analyzed teeth ended in a single root canal, while 51.8% ended in two; 41.4% had the same number of channels from the beginning to the end of the route; single channels present a strong tendency, in axial section, for the channel light to be flat. Brazilian Journal of health Review Braz. J. Hea. Rev., Curitiba, v. 3, n. 3, p. 5043-5054 may/jun. 2020. ISSN 2595-6825 5045

Análise da anatomia interna do segundo pré-molar superior por tomografia computadorizada cone beam