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*Corresponding Author: Marília FaguryMarceliano-Alves, Department of Endodontics, Iguaçu University, Nova Iguaçu, Av. Abílio Augusto Távora, 2134 Nova Iguaçu – RJ Brazil Zip: 26260-045
Citation: Luis Felipe Coutrin de Toledo, Cristiane de Souza Siqueira Pereira, Evelyn Oliveira de Paulo Barreto França, Thamires Chagas de Medeiros, Marco Orsini, Marco Azizi, Jacqueline Fernandes do Nascimento, Michelle Paiva Weydt Galhardi, Vivian Ronquete, Pablo Amoroso-Silva and Marília Fagury Videira Marceliano-Alves. (2020), The para-chloroaniline prevention after the use of sodium thiosulfate as an intermediary irrigator between sodium hypochlorite and chlorhexidine J. Endocrinology and Disorders
Copyright: © 2020, Marília FaguryMarceliano-Alves, This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received: 04 August 2020 | Accepted: 25 August 2020 | Published: 01 September 2020
Keywords: brown precipitate, chlorhexidine, irrigators, infrared spectrometry, para-chloroaniline, sodium hypochlorite
Objective: Evaluating the neutralization of sodium hypochlorite (NaOCl) by sodium thiosulfate in vitro, in different concentrations, in the prevention of para-chloroaniline (PCA) formation when in contact with CHX. Material and methods: It were collected 2 mL of NaOCl solution to 2.5% and to 6%, divided in eight groups according to the sodium thiosulfate concentration (1.0; 2.5; 5.0; 10%) (TSF). The tests were done in duplicate and in each plate, it was poured 2mL of TFS and the reaction was observed for 5 minutes. After, 2 mL of 2% Chlorhexidine (CHX) were pouring on the plates to verify the formation of PCA. The infrared spectroscopy with Fourier transform was used to verify the presence of PCA, and, in each solution, the pH was verified with universal strip.
Results: All analyzed samples presented presence of water and deuterium water, and there was not identification of the PCA presence. The pH result of the solutions was between 8 and 9. It was verified that in the increasing of the concentration of the TFS there was gradual formation of precipitated compound and increase of the turbidity of the final sample.
Conclusion: TFS can be used as an intermediate irrigation solution to prevent the formation of para-chloroaniline in the combined use of NaOCl and CHX.
The disinfection of the root canal system (RCS) is a fundamental factor in the endodontic therapy for the reduction of the number of microorganisms that is in the necro pulpectomy techniques and then collaborating to the maintenance of the healthy peri-root tissues or favor this region recuperation when that is a lesion (Siqueira et. al. 2017). The endodontic infections are caused by bacterial intra-root biofilms colonizing mainly the light of the main canal. Bacteria have the power of propagating into the dentin tubules, apical ramifications, lateral canals, isthmus and irregularities. Although the chemical-mechanical prepare is capable to eliminate a large quantity of micro-organisms, a complete disinfection is hard due to the complex anatomy of the RCS [1.2].
The action of the endodontic instruments during the instrumentation occurs only in the light of the main canal and it does not fully achieve the system of root canals. Thus, the using of an auxiliary chemical substance during the chemical mechanical prepare is especially important and aims to reach inaccessible areas to the instruments, to promote the additional elimination of microorganisms of the endodontic complex. The physical action of the irrigator liquid promotes the hydraulic circulation into the root canal, dragging tissues, micro-organisms, and dentin scrapings [2]. The chemical action of the irrigator substance should have the property of causing the bacteria and fungi death [4].
The effectiveness of the irrigation can be impaired due to the anatomic complexity of the root canal, that impedes the contact of the auxiliary substance with the tissues or micro-organisms, speed in the instrumentation that reduce the time of permanence of the substance into the canal, the short volume of the substance that a canal may contain and the deficient renew of the chemical substance during the prepare of the root canal. The authors related that the success of the endodontic therapy rest on three important bases: the chemical-mechanical prepare, the control of infection and filling of the root canals. They still highlighted that we should eliminate all the residue and micro-organisms into the root canals and that the action of an auxiliary chemical substance depends of factors as the contact area between the chemical substance and the pathogens, as the time of the action into the canal [5].
Some authors advocate the using of the intra-canal medication to the additional elimination of micro-organisms, which present significant result [6-8]. However, the using of the intra-canal medication presents the disadvantage of the need to add minimally a second session in the therapeutic attendance.
Aiming to eliminate additional consults, some procedures objective to maximize the effects of the chemical mechanical prepare immediately after its conclusion, disregarding the using of intra-canal medication, to the treatment can be done in an unique session with high incidence of negative cultures in the filling act and, then, with higher power of success [8].
Worldwide, the Sodium Hypochlorite (NaOCl) is considered the main endodontic irrigator, and this choice is related to its efficient antimicrobial capability and of alive or necrotic pulp tissues dissolution [9]. Associations of other solutions with the NaOCl in alternate use, during the irrigation, have been proposed with the objective to maximize the bacterial elimination of the root canal. (Siqueira et. al. 2002). About the handling that is highlighted, the final irrigation with CHX (CHX) 2% seems to be one of the most promising [10-11].
It occurs that the irrigation with NaOCl during the chemical mechanical prepare leave the residues of this substance adhered to the dentin walls and the sequential irrigation with CHX may generate the formation of a strong brown pigment native of the reaction between NaOCl and CHX called para-chloroaniline (PCA) [12].
Several articles evaluated the combined irrigation of the NaOCl and CHX and observed the formation of the PCA compound and for this reason unbutton this combined use in the irrigation of root canals [12-14]. Considering the possibility of disabling the chlorine content of the NaOCl, some substances were testes, as EDTA 17% and saline. However, between the evaluated substances, the most recommended has been TFS [16, 17].
Based in the data of previous studies, it is recommended to have caution using an intermediary irrigator between NaOCl and CHX preventing the formation of PCA precipitation [14, 15]. Thus, the aim of this study is to evaluate the using of TFS in different concentrations and these effects in the prevention of PCA in vitro formation when mixed to NaOCl in different concentrations. Consequently, when it occurs the disable of the NaOCl, it will be available the combined irrigation with CHX without formation of any precipitates and favoring the benefits of the synergic antimicrobial action through the irrigation of NaOCl and CHX.
The 2.5% NaOCl, 6% NaOCl, 2% CHX and different concentrations of TFS (1.0; 2.5; 5.0; 10 %) solutions were manipulated in magistral pharmacy, for the neutralization evaluation of NaOCl and CHX tests. All the used solutions were tested to verify the chloride presence using the infrared spectroscopy with Fourier transformer to serve as standard (Figure 1 and chart 1).
To the positive test, the NaOCl and CHX solutions were mixed and it was observed a brown product formation that is supposedly considered PCA, after the 5 minutes of observation period (Figure 1A). The negative test represents the chloride disable that can occur in two different relations, depending of the TFS concentration (Figure 1B). The Table 1 presents the composition of the samples destined to the previously cited tests. The product solutions were taken to the infrared spectroscopy with Fourier transform (FTIR) to evaluation in chloride presence.
After initial tests, it was done an experimental phase. For that, the analysis was divides in two groups: 2.5% NaOCl and 6% NaOCl, both with the addition of sodium thiosulfate in different concentrations. For all the tests the standard volume to each substance was 2 mL, independently of the concentration. The Chart 2 presents the division of the two groups to do the analysis.
For each group, 2 mL of NaOCl (2.5 or 6%) were deposited in Petri plates and, after, it was poured 2 mL of the TFS solution (concentrations in test). The reaction was observed for 5 minutes, with a digital chronometer to mark the intervals of application between the substances. After 5 minutes of the first mixture it was added 2 mL of CHX (2%), when it was observed visual if it was formation of PCA. The procedure was performed to all the TFS in test concentrations.
The analysis of the chloride presence, component of PCA, in the final solutions was performed by infrared spectroscopy with Fourier transformer (FTIR) that used as basis wave standard length to the identification of a possible presence of water and PCA. The appliance gives a graphic whose peaks are compared with a data bank of the equipment library. The chloride total concentration was evaluated with the chloride set use (Kit Vacu-Vials, Midland, United States) and standard samples were used as visual comparative parameter, one that contains solution in a pink coloration that means the chloride presence and other containing a colorless solution that means the chloride absence. The pH of the final samples has been also evaluated with universal pH indicator strip (Kasvi, São José dos Pinhais, Brasil), because the formed volume does not enough to the analysis in pHmeter.
The infrared spectroscopy with Fourier transformer gives data to the identification of the chemical composing from the measuring the vibration of molecules by the unfolding of the connections. To this analysis it was used as basis wave standard lengths to identify possible presences of water and PCA.
The Table 1 presents results obtained to the pH test of the solutions before the analysis accomplishment.
After the tests, it was verified that there was not formation of pink coloration in the chloride set, highlighting the chloride absence in the samples. The found results to the pH and chloride tests are presented in the Table 4.
It was verified that according to the increasing of TFS concentration there was gradual formation of precipitated and increasing of the turbidity of the final sample. The tests were done in duplicate to ensure the analytical reliability of the data (Figures 2 and 3).
During the verification by the infrared spectroscopy method the results are expressed through curves and graphics. All the analyzed samples presented correspondent curves, with hardly considerable dispersion. It was obtained as result only the presence of water and deuterium water that is the presence of undefined compounds in aqueous medium. Those are considered undefined compounds because there was not identification of PCA presence. The figures 13 and 14 expresses the comparison of the curve characteristics between the analyzed samples and between the water standard (Graphic 1).
Between the procedures involved in the endodontic infection, the irrigation can play an important role in the elimination of micro-organisms elimination in the root canal. Irrigators are used during the endodontic treatment to eliminate the loose debris, lubricating the dentin walls, dissolving organic material in the canal, and actuating as an antimicrobial [18, 19].
The cleaning and disinfection of procedures into the root canal systems are highly dependent of the mechanical and chemical effects of the irrigators. The mechanical effects during the irrigation are generated by the flux and re-flux of the irrigator solution in the root canal. Independently of the used irrigator type, the bacterial population into the canal is significantly reduced by the mechanical effects of the irrigation [20]. The chemical properties with antimicrobial effects of the irrigator solution may significantly help the mechanical effects to eliminate micro-organisms [18, 19].
Until the present date, NaOCl has been used worldwide as irrigator in the endodontic and no studies so far demonstrated other more efficient substance. Between the main characteristics of NaOCl, it is highlighted the effective antimicrobial activity of broad spectrum, capable to eliminate quickly vegetative bacteria, spore-forming bacteria, fungi, protozoa, virus and bacterial spores. Other irrigator substances and different strategies have been proposed to improve the cleaning and the antimicrobial capacity of the chemical mechanical preparation [13, 20]. An irrigator strategy commonly recommended is the NaOCl and CHX association [14, 20, and 21]. However, the formation of a precipitated called PCA can form when occurs the contact between NaOCl and CHX [14].
Studies evaluating PCA formation suggest that the combination NaOCl and CHX may be avoided due to the emergence of the reagent to this mixture [13-15]. However, there are studies that highlight that this combination more effective to eliminate micro-organisms when one of the substances is applied in isolation [10, 22].
As in other studies [23, 24]. It seems like a smart idea to apply NaOCl initially in the canal irrigation during endodontic therapy and using the benefits that this substance can offer in a moment that is very important to dissolve organic tissues, to eliminate micro-organisms and their products. Ended the chemical mechanical prepare with NaOCl, to irrigate the canals with CHX and in the same form seize the properties of this substance, highlighting the bactericidal potential in the medium term due to the substantivity, will contribute to a bigger elimination of possible irrigators that stay viable after the instrumentation is completed. Therefore, it is interesting to combine the NaOCl and CHX properties, without any precipitate been formed and there is no risk to the patient health. To neutralize the NaOCl before the use of CHX can present significant antimicrobial advantages.
In dentistry, TSF is constantly employed in the NaOCl neutralization, but without a protocol of use defined [24-31]. This study evaluated different variables in the disable process of NaOCl by TSF. Different concentrations of the samples were tested in a same volume in relation of time. It was identified possible variation of pH, after the mixture was done and the presence or not of residual chloride. A similar study was performed; however, it did not assess variable analysis during the time, pH or presence of chloride ions in the final precipitate [32].
TSF was efficient neutralizing NaOCl in all samples, even when the shorter concentration of TSF (1%) was applied on the higher concentration of NaOCl (6%). The pH of the final samples varies between 8 and 9 (alkaline). When most of the micro-organisms involved in the endodontic infections do not reproduce in alkaline environment [33-36], possible residues into RCS will not favor the multiplication of pathogens.
The use of TSF to neutralize solutions of NaOCl with an 8 to 10 pH, can result in the formation of shorter levels of chlorate [34-36]. The chlorate is a contaminant that can be present in the water and is in the list of undesirable substances of the Environmental Protection Agency of United States. The authors analyzed the NaOCl neutralization to 8.25% for 5 minutes. The pH of the samples after the mixture varied from 8 to 9. The authors highlighted that as higher TSF concentration, higher the whitish turbidity of the final sample, as also the presence of a characteristic sulfur odor was higher [34-36]. In this study, was not evaluated the presence of chlorate in the samples, and neither the turbidity of the samples quantitatively or qualitatively neither the generated odor, although both were noted. Only water and deuterium water could be identified in the final samples of this study.
Another study also assessed if PCA is formed by the reaction of mixture of NaOCl and CHX using different analyze techniques as highly efficient liquid chromatography, spectroscopy of nuclear magnetic resonance of protons, gas chromatography, thin-layer chromatography, spectroscopy in the infrared region and mass spectrometry. To obtain the brown precipitate, it was mixed 4.99% NaOCl with 2.0% chlorhexidine. The brown precipitate was analyzed and compared to signals obtained from 4.99% NaOCl solutions commercially available, 2% solutions and 98% PCA in the form of powder. After studies, the authors observed that the chromatographic and spectroscopic analysis demonstrates that the brown precipitate do not contains free PCA [35, 36].
The use of TSF intermediary between NaOCl and CHX prevented PCA formation in all samples. The application of TSF in the shortest concentration (1%) for 5 minutes was demonstrated as enough to prevent PCA formation when 2% CHX was added on NaOCl, even in the highest tested concentration (6%). The interaction of NaOCl and CHX forms an insoluble precipitate. It is considered prudent to prevent the formation of this precipitate using intermediary flushes of TSF in volumes of minimally 2 mL to neutralize the NaOCl before using CHX as a final irrigator. New studies varying time of action and concentration of TSF may be performed aiming to better clarify the possible variables of neutralization.
Acknowledgements
This study was supported by grants from Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ), Brazilian Governmental Institution.
Conflict of interest
The authors deny any conflict of interest.
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