RESUMO
INTRODUCTION: The present study aimed to describe an in vitro study model to investigate root surface strain (RSS) and its correlation with the initiation/propagation of microcracks during different endodontic procedures. METHODS: Four lower human incisors extracted microcrack free were selected by micro-computed tomographic imaging. Two strain gauges were bonded to the root surface of each incisor. Then, the teeth were prepared to reproduce the periodontal ligament artificially. The gauges were attached to a data acquisition system. The RSS was recorded during the entire endodontic procedure, which consisted of accessing the endodontic cavity, cleaning, shaping preparation with an Mtwo rotary system (VDW, Munich, Germany), and filling with a standardized technique. Each incisor was submitted to a different retreatment protocol and supplementary cleaning method as follows: (1) Reciproc (RC, VDW) + Flatsonic (FS; Helse, Santa Rosa de Viterbo, Brazil), (2) RC + XP-endo Finisher (XPF; FKG Dentaire, La Chaux-de-Fonds, Switzerland), (3) Mtwo retreatment (MR) + FS, and (4) MR + XPF. Finally, the teeth were rescanned to establish the postoperative microcrack formation by 2 well-trained and blinded examiners. RESULTS: The maximum and minimum RSS values were -120 and 510 microstrains, respectively, for all of the files. RC showed the highest RSS values during endodontic retreatment compared with MR. FS demonstrated a higher variation between the minimum and maximum RSS than XPF. No microcracks were observed in the specimens. CONCLUSIONS: This preliminary study proposed an experimental model that would combine 2 methods to evaluate the effects of endodontic systems on dentin. Although strain gauges would provide data on the stresses created, the pre- and postoperative evaluation of micro-computed tomographic images would enable microcrack formation to be determined.
Assuntos
Cavidade Pulpar , Preparo de Canal Radicular , Brasil , Humanos , Retratamento , Microtomografia por Raio-XRESUMO
Although the odontology professional recognizes the existence of norms most of them had not demonstrated to perceive the fair and precise need of clarification. The perception lack displays to some problems as: lack of information on the necessity of accomplishment of periodic medical examinations of the professionals, lack of knowledge in the correct use of the equipment of x-rays, unfamiliarity of the necessity of periodic calibration of the device of x-rays, the inefficiency in the fulfillment of the radiation protection norms, the inadequate use of the equipment of individual protection (EPI) and absence of a manual of norms of the professional activities. Based in these results it can be concluded that the surgeon-dentists do not withhold the necessary knowledge on the norms of radiation protection and the correct use of the equipment of individual protection. Thus the implementation of a continued education program based on the reality of the dentist professional will be able to solve chronic problems identified in this study in the fulfillment of the requirements of the similar norms of radiation protection, and providing safe manuscript of the equipment of x-rays in the dentistry offices.
Assuntos
Odontologia , Cirurgia Geral , Conhecimentos, Atitudes e Prática em Saúde , Proteção Radiológica/instrumentação , Proteção Radiológica/normas , HumanosRESUMO
Mesmo reconhecendo a existência das normas, a maior parte dos profissionais de odontologia não demonstra perceber a necessidade justa e precisa de esclarecimento. A falta de percepção expõe a vários problemas como falta de informação sobre a necessidade de realização de exames médicos periódicos dos profissionais, falta de conhecimento na correta utilização do equipamento de raios X, desconhecimento da necessidade de calibração periódica do aparelho de raios X, ineficiência no cumprimento das normas de radioproteção, uso inadequado do equipamento de proteção individual (EPI) e ausência de um manual de normas das atividades profissionais. Com bases nesses resultados, pode-se chegar à conclusão de que os cirurgiões-dentistas não detêm o conhecimento necessário sobre as normas de radioproteção e da correta utilização do EPI. Assim, acredita-se que a implementação do programa de educação continuada a partir da realidade do profissional de odontologia forneça os meios para resolução de problemas crônicos detectados neste estudo no cumprimento das exigências das normas de radioproteção e afins, proporcionando manuseio seguro do equipamento de raios X no consultório odontológico.
ABSTRACT Although the odontology professional recognizes the existence of norms most of them had not demonstrated to perceive the fair and precise need of clarification. The perception lack displays to some problems as: lack of information on the necessity of accomplishment of periodic medical examinations of the professionals, lack of knowledge in the correct use of the equipment of rays-x, unfamiliarity of the necessity of periodic calibration of the device of rays-x, the inefficiency in the fulfilment of the radiation protection norms, the inadequate use of the equipment of individual protection (EPI) and absence of a manual of norms of the professional activities. Based in these results it can be concluded that the surgeon-dentists do not withhold the necessary knowledge on the norms of radiation protection and the correct use of the equipment of individual protection. Thus the implementation of a continued education program based on the reality of the dentist professional will be able to solve chronic problems identified in this study in the fulfilment of the requirements of the similar norms of radiation protection, and providing safe manuscript of the equipment of rays-x in the dentistry offices.