One of the main objectives of endodontic treatment is the decontamination of root canal systems. The removal of the smear layer is important, as it acts as a barrier, interfering in the diffusion of antimicrobial agents and in the adequacy between the filling materials and the canal walls. In this way, different irrigation techniques and devices have emerged to increase chemical disinfection and improve cleaning after mechanical instrumentation. The main objective of the present study was to analyze the effectiveness of different endodontic irrigation techniques in removing smear layer. As an inclusion criterion, articles from the PubMed and Google Scholar database were used. In PubMed, 397 articles were found, 10 were selected and in Google Scholar, 857 articles were found, 11 of which were selected for the research. . Thus, a final sample of 21 articles inserted in the work was obtained. It is concluded that all endodontic irrigation techniques removed more smear layer compared to conventional irrigation, but none was able to remove it entirely. Further laboratory and clinical studies are needed to prove the effectiveness of removing this layer with the standardization of clinical protocol.

Ozone (O3) is an allotropic oxygen compound, found in abundance in the stratosphere and which, due to its antimicrobial, disinfectant and healing properties, provide therapeutic applications for more than 260 different pathologies. Ozone therapy is a technique that uses this gas, in its gaseous, aqueous and oily forms as a disinfection treatment option, being considered a safe, minimally invasive and conservative modality. This study aimed to review the literature on ozone therapy applied to dentistry, aiming to clarify its benefits and care during use as complementary therapy. For that, searches were carried out in databases addressing the theme proposed between 2007 and 2020, in three languages: Portuguese, English and Russian. It is concluded that Ozone therapy can be used safely and efficiently in dentistry as a complementary disinfection practice, without contraindications. Although laboratory studies have emerged as a promising potential for ozone in dentistry, more in-depth studies with standardized methodologies are needed to, in short, obtain more information about its applicability.

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Root canal filling is one of the stages of endodontic treatment that deserves special attention, being responsible for the final sealing, avoiding recontamination and reinfection in that space. The objective of this research was to evaluate in vitro the influence of three endodontic filling techniques in the filling of simulated lateral canals, these being the Lateral Condensation Technique, Continuous Wave Technique and Hybrid Tagger Technique. Thirty lower premolar teeth were used, which were divided into three groups (n = 10) for comparisons of filling techniques. The chemical-mechanical preparation was carried out with Protaper Universal rotary files, then lateral canals at the apical, medium and cervical level were made with an LN drill. The teeth were filled and evaluated with digital radiography considering the amount of simulated canals that were filled by the filling material. The results were subjected to statistical analysis using the non-parametric Chi-square test, in which a statistical difference was considered when p <0.05. The lateral condensation technique showed the lowest results with a statistically significant difference (p <0.05), when compared to the Tagger hybrid and continuous wave, however there was no statistical difference between the Tagger hybrid technique and continuous wave (p> 0.05). It was concluded that none of the three techniques was able to fill all the simulated lateral channels. The continuous wave technique presented the largest amount of pre-filled lateral canals, followed by the Tagger hybrid technique and lateral condensation.

Endodontic obturation has the purpose to fill three-dimensional root canal system. The search for this objective resulted in the emergence of different techniques. The study proposed to evaluate, in vitro, the influence of Single Cone and Continuous Wave techniques on the adhesion of EndoSequence BC (Brasseler USA, Savannah, USA), Pulp Canal Sealer EWT (SybronEndo, Orange USA) and AH Plus (Dentsply , USA) to the dentinal walls of the root canals of extracted human teeth. Seventy-two human premolars were divided into 6 experimental groups (n = 12). The teeth were instrumented and obturated in a standardized way by means of the single cone technique or the continuous wave technique according to the specification of each group: a) EBC-