Análise da presença de gap através do marcador nitrato de prata em dentes bovinos obturados por diferentes cimentos endodonticos e após o selamento do canal protético com resina flow

• Autor(a) principal: Pereira, Charles da Cunha
• Data de Publicação: 2014
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da PUC_RS
• Texto Completo: http://tede2.pucrs.br/tede2/handle/tede/1274
• topic: ODONTOLOGIA; ENDODONTIA; TRATAMENTO DE CANAL RADICULAR; MICROSCOPIA; NITRATOS; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The longevity of endodontic treatments depends on many variables, including the aging of the filling material and the sealing of the root canal, especially when there is exposure to oral fluids. The aim of this study was to evaluate in vitro the silver nitrate gap penetration in root canals of bovine teeth filled with different endodontic sealers and sealing of the post space preparation with flow resin. The dental crowns of sixty bovine incisors were sectioned and root canals were prepared using a serial technique. The specimens were randomly divided into 6 groups (n= 10 specimens each) according to the root canal sealer used: (AH) AH Plus; (CP) Endo CPM sealer; (EN) Endofill; (RE) RealSeal SE; (SS) AH Plus and post space preparation; (CS) AH Plus and post space preparation and sealing with resin flow. The root canals were filled by lateral condensation using gutta-percha and one of the sealers described above. In groups SS and CS the post space was performed immediately after filling. Ten specimens were randomly selected and the remaining filling was sealed with flow resin. The roots of groups AH, CP, EN and RE, and SS and CS were stored at 100% humidity for 24 months and 24 hours, respectively. After this period, the specimens were immersed in a solution of silver nitrate and prepared for electron microscope (SEM). The areas of filling material-dentin were observed to assess the degree of penetration by silver nitrate. The results show that there were statistically significant differences between the experimental groups AH, CP, EN and RE (p0,05). The sealers AH Plus, Real Seal SE and Endo CPM Sealer showed less infiltration of silver nitrate compared to Endofill (p0,05). Among groups SS and CS, the results showed no statistically significant difference in the penetration of silver nitrate (p > 0.05). By analyzing the results we can conclude that all root canals showed some degree of gap penetration through the marker silver nitrate. AH Plus, Endo CPM Sealer and RealSeal SE obtained lower gap penetration scores than Endofill. The sealing of the post space preparation with flow resin did not prevent gap formation when compared to the group without sealing.