Pulp diseases commonly happens because of the actions of bacteriological factors and show their characteristic signs and symptoms over the time. With pulp necrosis, a degenerative process starts and when there is no early treatment, it is possible to occur periapical lesions as a result of aggression to the pulp. In cases of periapical secondary lesions, clinical signs and symptoms persist and are related to secondary infection due to persistent bacterial contamination, also to operative factors, inadequate obturation or poor coronary restoration. This study aimed to report a case of endodontic retreatment and clinical and radiographic follow-up for 8 years, of chronic periapical abscess case, in which after retreatment, clinical signs and symptoms are no longer observed and bone neoformation is noticed. Descriptors: Periapical Diseases; Endodontics; Periapical Abscess. Referências Alani AH. Endodontic treatment of bilaterally occurring four-rooted maxillary second molars: case report. J Can Dent Assoc. 2003;69(11):733–35. Slowey RR. Radiographic aids in the detection of extra root canals. Oral Surg Oral Med Oral Pathol 1974;37(5):762-72 Bergenholtz G, Malmcrona E, Milthon R. Endodontic treatment and periapical status I. Radiographic evaluation of the frequency of endodontically treated teeth. Tandl€akartidningen. 1973; 65:64–73 (In Swedish, English summary). Buckley M, Spangberg LS. The prevalence and technical quality of endodontic treatment in an American subpopulation. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1995;79(1):92–100. Saunders WP, Saunders EM, Sadiq J, Cruickshank E. Technical standard of root canal treatment in an adult Scottish sub-population. Br Dent J. 1997;182(10):382-86. Segura-Egea JJ, Jimenez-Pinzon A, Poyato-Ferrera M, Velasco-Ortega E, Rios-Santos JV. Periapical status and quality of root fillings and coronal restorations in an adult Spanish population. Int Endod J. 2004;37(8):525-30. Kabak Y, Abbott PV. Prevalence of apical  periodontitis and the quality of endodontic treatment in an adult Belarusian population. Int Endod J. 2005;38(4):238-45. Glickman GN. AAE consensus conference on diagnostic terminology: background and perspectives. J Endod. 2009;35:1619. Gutmann JL, Harrison JW. Surgical endodontics: an online study guide. Blackwell Scientific Publications; 1991. Molven O, Halse A, Grung B. Incomplete healing (scar tissue) after periapical surgery - radiographic findings 8 to 12 years after treatment. J Endod. 1996;22(5):264-68. Macedo, IL Retratamento endodôntico: opção terapêutica do insucesso endodôntico. BJHR. 2018;1(2):421-31. Souza VC et al. Tratamento do insucesso endodôntico. Rev Odontol Bras Central. 2018; 27:44-48. Bender IB, Seltzer S, Soltanoff W. Endodontic success – a reappraisal of criteria. Oral Surg Oral Med Oral Pathol. 1966; 22(6):790–802. Rubinstein R A, Kim S. Long-term follow-up of cases considered healed one year after apical microsurgery. J Endod. 2002; 28(5):378-83. Estrela C et al. Characterization of successful root canal treatment. Braz Dent J. 2014; 25(1):3-11 http://dx.doi.org/10.1590/0103-6440201302356 Kaled GH et al. Retratamento endodôntico: análise comparativa da efetividade da remoção da obturação dos canais radiculares realizada por três métodos. RGO, Rev. gaúch. odontol. (Online). 2011;59(1):103-8. Rossi-Fedele G, Ahmed HMA. Assessment of rootcanal filling removal effectiveness using micro–computedtomography: a systematic review. J Endod. 2017;43(4):520-26 Barbosa SV, Burkhard DH, Spanberg LSV. Cytotoxic effects of gutta-percha solvents. J Endod. 1994; 20(1):6-8. Zakariasen KL, Brayton SM, Collinson DM. Efficient and effective root canal retreatment without chloroform. J Canad Dent Assoc. 1990; 56(6):509-12. Pecora JD, Spano JC, Barbin EL. In vitro study on the softening of gutta-percha cones in endodontic retreatment. Brazilian. Braz Dent Journal. 1993; 4(1): 43-7. Scelza MF et al. Comparative SEM evaluation of three solvents used in endodontic retreatment: an ex vivo study. Journal of Applied Oral Science. 2008; 16(1):24-9. Marques da Silva B et al. Effectiveness of ProTaper, D-RaCe, and Mtwo retreatment files with and without supplementary instruments in the removal of root canal filling material. Int Endod J. 2012; 45(10):927-32 Song M1 et al. Analysis of the cause of failure in nonsurgical endodontic treatment by microscopic inspection during endodontic microsurgery. J Endod. 2011;37(11):1516-9. Albuquerque MS et al. Sealing Capacity of Bulk-fill Resin in Endodontically Treated Teeth. The Journal of Contemporary Dental Practice. 2019; 20(3): 311-17 Zancan RF, Vivan RR, Lopes MRM et al. Antimicrobial activity and physicochemical properties of calcium hydroxide pastes used as intracanal medication. J Endod. 2016. 42(12):1822-28. Buttler TK, Crawford JJ. The detoxifying effect of varying concentrations of sodium hypochlorite on endotoxins. J Endod. 1982; 8(2):59-66. Foley DB, Weine FS, Hagen JC, deObarrio JJ. Effectiveness of selected irrigants in the elimination of bacteroides meloninogenicus from the root canal system: an in vitro study. J Endod. 1983; 9(6):236-41. Abou-Ran M, Oglesby SW. The effects of temperature, concentration and tissue type on the solvent ability of sodium hypochlorite. J Endod. 1981; 7(8):376-7. Lee JK et al. Physicochemical Properties of Epoxy Resin-Based and Bioceramic-Based Root Canal Sealers. Bioinorg Chem Appl. 2017; 1-8.  Kandemir DG, Caliskan MK. A prospective Ramdomized  Comparative Study of Cold Lateral Condensation Versus Core/Guta Percha in Teeth with Periapical Lesions. J Endod. 2016; 42(2):206-10 Karaman E, Keskin B, Inan U. Three-year clinical evaluation of class II posterior composite restorations placed with different techniques and flowable composite linings in endodontically treated teeth. Clin Oral Investig. 2017; 21(2):709-16.

A importância da prática odontológica segura diante da Covid-19: uma revisão da literatura The importance of safe dental practice in the face of Covid-19: a literature review

RESUMO Os sistemas CAD/CAM surgem como uma das maiores inovações na Odontologia contemporânea. Por meio da digitalização, o planejamento virtual e a confecção de peças protéticas, ocorreu a simplificação e a otimização do tratamento reabilitador. O objetivo deste estudo é abordar a técnica de uso do CAD/CAM, suas principais características, vantagens e desvantagens quando utilizados em prótese dentária. Foi realizada uma revisão de literatura através da busca de estudos anexados nas bases de dados: Bireme e Pubmed, publicados entre os anos de 2003 e 2018. Entre as vantagens da utilização dos sistemas CAD/CAM, podemos destacar a melhor reprodutibilidade e precisão, menor tempo de fabricação, além da possibilidade de utilização de cerâmicas mais resistentes e confecção de restaurações com este material. A principal desvantagem relatada ainda é o alto custo do equipamento. A tecnologia CAD/CAM no intuito de automatizar e agilizar o processo de confecção das próteses, sendo capaz de produzir peças de alta qualidade com uma enorme variedade de materiais. Apesar disso, a técnica deve ser ajustada com base nas necessidades dos materiais a serem utilizados e as preferências do cirurgião-dentista e técnico em prótese dental. ABSTRACT CAD/CAM Systems emerge as one of the greatest innovations in contemporary dentistry. Through digitalization, the virtual planning and the manufacture of prosthetic parts, the simplification and optimization of the rehabilitator treatment occurred. The aim of this study is to approach the technique of CAD/CAM use, its main characteristics, advantages and disadvantages when used in dental prosthesis. A literature review was conducted through the search for studies attached in the databases: Bireme and Pubmed, published between 2003 and 2018 years. Among the advantages of using CAD/CAM systems, we can highlight the best reproducibility and accuracy, shorter manufacturing time, besides the possibility of using more resistant ceramics and making restorations with this material. The main disadvantage reported is still the high cost of the equipment. CAD/CAM technology in order to automate and streamline the process of making prostheses, being able to produce high quality parts with a huge variety of materials. Nevertheless, the technique should be adjusted based on the needs of the materials to be used and the preferences of the dentist and technician in dental prosthesis.

RESUMO O objetivo deste trabalho é relatar um caso de tratamento endodôntico por pulpite sintomática aguda do primeiro molar inferior esquerdo onde no momento da instrumentação houve separação de lima rotatória do sistema Protaper Universal (PU). Um paciente de 40 anos compareceu a nossa clínica odontológica queixando-se de dor intensa, pulsátil, e que após teste térmico demorou alguns minutos para aliviar. O diagnóstico foi de pulpite sintomática aguda, optando-se pelo tratamento endodôntico. Durante preparo mecânico houve separação de lima S2 (PT) no terço médio do canal mésio-lingual, sendo utilizado ultrassom para sua remoção. Após a realização do tratamento proposto pode-se constatar desaparecimento sintomas clínicos. ABSTRACT The objective of this work is to report a case of endodontic treatment by acute symptomatic pulpitis of the first left lower molar where at the time of instrumentation there was a rotational file separation of the Protaper Universal (PU) system. A 40-year-old patient attended our dental clinic complaining of intense, pulsatile pain, and that after thermal testing it took a few minutes to relieve. The diagnosis was acute symptomatic pulpitis, opting for endodontic treatment. During mechanical preparation there was separation of file S2 (PT) in the middle third of the Mésio-lingual channel, being used ultrasound for its removal. After the proposed treatment, clinical symptoms may be reported missing.

EditorialCaro(a) Leitor(a),O 1º Encontro das Ligas Acadêmicas de Odontologia (1º ELA) foi planejado e organizado por docentes e discentes do Centro Universitário Maurício de Nassau (Uninassau), unidade Graças. O Encontro teve como principal objetivo difundir e atualizar os conhecimentos acerca de assuntos da área de interesse da Odontologia. As palestras ministradas contaram com uma grade de palestrantes renomados, no qual abordaram conteúdos de riquíssima qualidade científica, colaborando assim para o aprimoramento do conhecimento científico de todos participantes do nosso encontro, além dos mini-cursos e hands on oferecidos nos dois dias de evento.Desde já, agradeço ao periódico Archieves of Health Investigation pela honrosa oportunidade em publicar nossos resumos dos trabalhos apresentados no encontro.Prof. Dr. Arnoldo Vasconcelos de Alencar FilhoPresidente do 1º ELA UNINASSAU - 1º Encontro das Ligas Acadêmicas de Odontologia UNINASSAU