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ABSTRACT Objective: To compare clinical and radiographical pulpectomy outcomes in primary teeth filled with different pastes. Material and Methods: The sample included thirty-eight teeth indicated for pulpectomy due to irreversible pulp inflammation or necrosis from thirty patients (2 to 9 years old). The first appointment comprised chemomechanical preparation (2.5% sodium hypochlorite), smear layer removal (6% citric acid), intracanal dressing and temporary restoration. Seven days later, teeth were randomly assigned to filling with iodoform (IP) or calcium hydroxide with zinc oxide (CHZO) based pastes and temporarily restored. Final restoration (composite resin) occurred at the 3rd appointment. Data from baseline, 6 and 12 months were analysed using descriptive and inferential statistics (p≤0.05). Results: The overall frequency of success was 63.6% (n=21), with no significant difference between groups (IP=62.5% n=10; CHZO=64.7% n=11, p=0.59). Multiradicular teeth, overfilled canals and teeth whose coronal restoration have been lost were significantly associated with failure (p=0.01, p=0.04 and p<0.001, respectively). Conclusion: After 12 months, both pastes showed similar outcomes and can be used as good options for pulpectomies in primary teeth. Moreover, tooth location, extent of the root canal filling, and integrity of final restoration during the follow-up influenced the outcome of pulpectomies.

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Objetivou-se elaborar um e-book aos cirurgiões-dentistas sobre as opções de sistema de instrumentação endodôntica para dentes decíduos e comparar os resultados biomecânicos de diferentes sistemas e seu tempo de preparo em protótipos de dentes decíduos por meio de uma análise em micro-CT. Para isso, foram realizados dois estudos. No primeiro, realizou-se uma busca bibliográfica em seis bases de dados por estudos laboratoriais e clínicos sobre protocolos de pulpectomia utilizando pelo menos uma técnica de instrumentação. Dados a respeito das características, cinemática, benefícios e orientações à cerca da utilização de acordo com as instruções dos fabricantes foram extraídos para elaboração do conteúdo teórico e diagramação do layout do e-book, confeccionado no programa Canva. Após finalizado, o mesmo foi avaliado por três pós-graduandos da Disciplina de Odontopediatria da FOUFRJ e as sugestões foram incorporadas. Elaborou-se o material intitulado ''Guia ilustrado de instrumentação endodôntica para dentes decíduos'' contendo 43 páginas, abordando 13 sistemas de instrumentação, com sequências ilustradas de protocolos para utilização. Para o segundo estudo foram utilizados 60 protótipos padronizados de segundos molares decíduos inferiores confeccionados em polímero transparente para avaliar os resultados biomecânicos da instrumentação com diferentes sistemas de limas. Foram utilizados os sistemas manual k-file e mecanizados ProTaper Nextâ (PTN), XP- Endoâ Shaper (XPS), XP- Endoâ Finisher (XPF), XP­Clean (XPC) e Sequence Baby file (SBF) (n= 10/cada). A instrumentação foi realizada por um único operador treinado e o tempo de utilização de cada sistema foi cronometrado. Realizouse a irrigação com um total de 16mL de soro fisiológico à 0,9% para cada canal instrumentado, associada a aspiração simultânea. Os protótipos foram escaneados antes e após da instrumentação através do micro-CT. A reconstrução foi padronizada os conjuntos de imagens iniciais e instrumentados foram registrados entre si. Alterações no volume do canal radicular, área não instrumentada, debris acumulados, volume de dentina removido e transporte do canal foram quantificados. Os dados foram tabulados no programa JAMOVI versão 1.6 e analisados através do teste Shapiro-Wilk para verificar a distribuição dos dados. Para distribuição normal foram realizados testes paramétricos e para aqueles que não seguiram a normalidade, testes não paramétricos foram utilizados, todos com um nível de significância de 5% (p<0,05). A instrumentação com sistemas mecanizados resultou em menos tempo de instrumentação (p< 0,001) do que com a k-file. A porcentagem de áreas não instrumentadas foi semelhante para todos os sistemas. O acúmulo de debris foi maior para K-file e XPS ao longo de todo o canal (p<0,05). Todos os grupos apresentaram aumento do volume do canal radicular após a instrumentação (p= 0,003) com valores mais elevados na lima K-file (p<0,05). A análise 3D revelou maior transporte da lima K-file. SBF e K-file apresentaram, respectivamente, o menor (0,01 ± 0,01 e 0,03 ± 0,04) e o maior (0,04 ± 0,05 e 0,32 ± 0,94) valor de transporte do canal nos protótipos. Diante das metodologias utilizadas, conclui-se que um material relevante e prático ficará disponível nas plataformas digitais da Disciplina de Odontopediatria da UFRJ, para livre acesso e ampla divulgação aos cirurgiões-dentistas. Além disso, com relação aos resultados de instrumentação mecânica, o SBF e o XPC resultaram em uma abordagem mais conservadora. A instrumentação mecânica pode levar à algum grau de transporte do canal e deixar partes das paredes do canal infectadas sem preparo mecânico. (AU)

The objective was to elaborate an e-book to dentists about the options of endodontic instrumentation system for primary teeth and to compare the biomechanical outcomes of the different systems and their instrumentation time in prototypes of primary teeth through micro-CT analysis. To this end, two studies were carried out. In developing the first, a bibliographic search was carried out in six databases. Laboratory and clinical studies with a pulpectomy protocol using at least one instrumentation technique were included. Data about features, kinematics, benefits, and guidelines on use according to the manufacturer's instructions were extracted to prepare the theoretical content and layout diagramming of the e-book using Canva software. Afterwards, it was evaluated by 3 postgraduate students of the Pediatric Dentistry Discipline-FOUFRJ and the suggestions for changes were incorporated. The product entitled 'Guia ilustrado de instrumentação endodôntica para dentes decíduos' contains 43 pages covering 13 instrumentation systems and illustrated sequence of protocols use for each. The second consists of 60 standardized prototype teeth of mandibular second primary molars made with transparent polymer to evaluate the outcomes of biomechanical instrumentation of different systems. Manual k-file, ProTaper Nextâ (PTN), XP-Endoâ Shaper (XPS), XP-Endoâ Finisher (XPF), XP ­ Clean (XPC) and Sequence Baby file (SBF) (n= 10/each) were used. The specimen instrumentation was performed by a single trained and the time spend was recorded. Irrigation was performed with a total of 16mL of 0.9% saline solution for each instrumented canal and simultaneous aspiration. The prototypes were scanned before and after the instrumentation using micro-CT. In addition, the reconstruction was standardized and initial and instrumented image sets were registered with each other. Next, changes in root canal volume, noninstrumented areas, accumulated debris, removed dentin volume and canal transportation were quantified. Data were tabulated in the JAMOVI program version 1.6 and analyzed using the Shapiro-Wilk test to verify the data distribution. For normal distribution, parametric tests were performed and that did not follow normality, nonnormal tests were used, all with a significance level of 5% (p<0.05). Instrumentation with rotary files resulted in less time-consuming (p <0.001) than manual k-file. The percentage of non-instrument areas were similar for all systems. Accumulated debris was higher for K-file and XPS along the entire canal. All groups showed an increase in root canal volume after instrumentation (p= 0.003) with higher values in K-file (p <0.05). 3D analysis revealed greater transportation in K-file. SBF and K-file showed, respectively, the lowest (0.01± 0.01 and 0.03 ± 0.04) and highest (0.04 ± 0.05 and 0.32 ± 0.94) canal transportation value in the prototypes. Given the methodology applied, it was concluded that: the didactic material will be available on the digital platforms of Pediatric Dentistry at UFRJ for free access and widespread. From the overall mechanical instrumentation outcomes, the SBF and XPC resulted in a more conservative approach. Mechanical instrumentation may lead transportation and leave preparation. (AU)

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Abstract Objective: To evaluate the antimicrobial action of the CTZ paste in three different proportions by diffusion in agar with the microorganisms: Enterococcus faecalis,Escherichia coli, and Candida albicans. Material and Methods: Three different proportions of antibiotics were tested: GROUP A - CTZ paste in the ratio of 33.33% chloramphenicol + 33.33% tetracycline + 33.33% zinc oxide, mixed with 2 drops of eugenol (1:1:1 ratio); GROUP B - CTZ paste in the proportion of 25% chloramphenicol + 25% tetracycline + 50% zinc oxide, mixed with 2 drops of eugenol (1: 1: 2 ratio); GROUP C - CTZ paste with 13% chloramphenicol + 13% tetracycline + 74% Zinc Oxide, mixed with 2 drops of eugenol (1:1:6 ratio); PC GROUP - Positive Control (0.12% Chlorhexidine); and NC GROUP - Negative Control (0.9% Saline solution). Data were analyzed through descriptive statistics (means and standard deviation). The one-way ANOVA and Tukey's test were used, with a significance level of 5% Results: No statistical differences for Enterococcus faecalis between groups A, B, and C (p = 0.1986) were found. There were statistical differences for Escherichia coli between groups B and C (p = 0.029), and for Candida albicans between groups A and C (p = 0.006). Groups A, B, and C had significant differences with both Positive and Negative Controls for all the microorganisms Conclusion: The three different ratios of CTZ paste showed antimicrobial efficacy against Enterococcus faecalis,Escherichia coli, and Candida albicans microorganisms.

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AIM: To assess the effectiveness of three systems of mechanical preparation to reduce Enterococcus faecalis within root canals. METHODOLOGY: Twenty-four human single-rooted canine teeth were standardized to a length of 17 mm and the canal contents removed using a size 20 K-file, as the last apical file. After irrigation and sterilization, the canals were contaminated with E. faecalis and incubated for 21 days at 37 °C with 5% CO(2). Then, the teeth were divided into three groups for mechanical preparation with: ProTaper rotary system, ProTaper manual system and manual K-files. Samples of the root canal contents, before and after the debridement, were collected with sterile paper points for 1 min. Then, the samples were diluted and plated in Brain Heart Infusion (BHI) agar. The colony-forming units were counted and the percentage reduction calculated. The reduction and log CFU mL(-1) were compared between groups using Wilcoxon nonparametric test and two-way analysis of variance, respectively. RESULTS: There was a significant reduction in the number of CFU/mL (P = 0.000) before and after debridement for all the systems used. However, there was no significant difference between the systems. CONCLUSION: All the three instrumentation systems reduced E. faecalis counts to a similar degree.

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This study investigated the influence of cervical preflaring with different rotary instruments on determination of the initial apical file (IAF) in mesiobuccal roots of mandibular molars. Fifty human mandibular molars whose mesial roots presented two clearly separated apical foramens (mesiobuccal and mesiolingual) were used. After standard access opening and removal of pulp tissue, the working length (WL) was determined at 1 mm short of the root apex. Five groups (n=10) were formed at random, according to the type of instrument used for cervical preflaring. In group 1, the size of the IAF was determined without preflaring of the cervical and middle root canal thirds. In groups 2 to 5, preflaring was performed with Gates-Glidden drills, ProTaper instruments, EndoFlare instruments and LA Axxes burs, respectively. Canals were sized manually with K-files, starting with size 08 K-files, inserted passively up to the WL. File sizes were increased until a binding sensation was felt at the WL and the size of the file was recorded. The instrument corresponding to the IAF was fixed into the canal at the WL with methylcyanoacrylate. The teeth were then sectioned transversally 1 mm short of the apex, with the IAF in position. Cross-sections of the WL region were examined under scanning electron microscopy and the discrepancies between canal diameter and the diameter of IAF were calculated using the tool "rule" (FEG) of the microscope's proprietary software. The measurements (microm) were analyzed statistically by Kruskal-Wallis and Dunn's tests at 5% significance level. There were statistically significant differences among the groups (p<0.05). The non-flared group had the greatest discrepancy (125.30 +/- 51.54) and differed significantly from all flared groups (p<0.05). Cervical preflaring with LA Axxess burs produced the least discrepancies (55.10 +/- 48.31), followed by EndoFlare instruments (68.20 +/- 42.44), Gattes Glidden drills (68.90 +/- 42.46) and ProTaper files (77.40 +/- 73.19). However, no significant differences (p>0.05) were found among the rotary instruments. In conclusion, cervical preflaring improved IAF fitting to the canals at the WL in mesiobuccal roots of maxillary first molars. The rotary instruments evaluated in this study did not differ from each other regarding the discrepancies produced between the IAF size and canal diameter at the WL.

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This study investigated the influence of cervical preflaring with different rotary instruments on determination of the initial apical file (IAF) in mesiobuccal roots of mandibular molars. Fifty human mandibular molars whose mesial roots presented two clearly separated apical foramens (mesiobuccal and mesiolingual) were used. After standard access opening and removal of pulp tissue, the working length (WL) was determined at 1 mm short of the root apex. Five groups (n=10) were formed at random, according to the type of instrument used for cervical preflaring. In group 1, the size of the IAF was determined without preflaring of the cervical and middle root canal thirds. In groups 2 to 5, preflaring was performed with Gates-Glidden drills, ProTaper instruments, EndoFlare instruments and LA Axxes burs, respectively. Canals were sized manually with K-files, starting with size 08 K-files, inserted passively up to the WL. File sizes were increased until a binding sensation was felt at the WL and the size of the file was recorded. The instrument corresponding to the IAF was fixed into the canal at the WL with methylcyanoacrylate. The teeth were then sectioned transversally 1 mm short of the apex, with the IAF in position. Cross-sections of the WL region were examined under scanning electron microscopy and the discrepancies between canal diameter and the diameter of IAF were calculated using the tool "rule" (FEG) of the microscope's proprietary software. The measurements (µm) were analyzed statistically by Kruskal-Wallis and Dunn's tests at 5 percent significance level. There were statistically significant differences among the groups (p<0.05). The non-flared group had the greatest discrepancy (125.30 ± 51.54) and differed significantly from all flared groups (p<0.05). Cervical preflaring with LA Axxess burs produced the least discrepancies (55.10 ± 48.31), followed by EndoFlare instruments (68.20 ± 42.44), Gattes Glidden drills (68.90 ± 42.46)...

Este estudo investigou a influência do alargamento cervical feito com diferentes instrumentos rotatórios na determinação do instrumento apical inicial (IAI) das raizes mésio-vestibulares de molares inferiores. Foram utilizados 50 molares inferiores cujas raízes mesiais apresentavam dois forames apicais nitidamente separados (mésio-vestibular e mésio-lingual). Após o acesso à câmara pulpar de forma convencional e remoção do tecido pulpar, o comprimento de trabalho foi definido a 1 mm do ápice radicular. Os dentes foram divididos aleatoriamente em cinco grupos (n= 10) de acordo com o tipo de instrumento utilizado no alargamento cervical. No grupo 1, o IAI foi definido sem o prévio alargamento dos terços médio e cervical das raízes. Nos grupos 2 a 5, o terço cervical e médio do canal radicular foi alargado com as brocas de Gates-Glidden, instrumentos Pro Taper, Endo Flare e brocas LA Axxes, respectivamente. A determinação do IAI foi realizada manualmente com limas tipo K em ordem crescente de diâmetro a partir da lima 08 até se chegar ao instrumento que permitisse ao operador ter a sensação tátil do mesmo estar firmemente ajustado ao CRT. O instrumento que correspondeu ao IAI foi fixado no interior do canal radicular com cianocrilato de metila. Com o IAI posicionado, os dentes foram seccionados transversalmente até 1 mm do ápice. As seções transversais do CRT foram observadas através da microscopia eletrônica de varredura e os desajustes entre o diâmetro do canal e o diâmetro do IAI foram calculados com a função "régua" (FEG) do software do próprio microscópio. Os resultados foram avaliados estatisticamente pelo testes de Kruskal-Wallis e Dunn ao nível de significância de 5 por cento. Houve diferenças estatisticamente significantes entre os grupos (p<0,05). O grupo sem alargamento apresentou o maior desajuste (125,30 ±51,54) e diferiu significativamente dos demais grupos (p<0,05). O alargamento cervical com as brocas LA Axxess apresentou...

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AIM: To compare the percentage of filled canal area in mandibular molar roots after using conventional root-canal hand instrumentation or after a noninstrumentation technique (NIT). METHODOLOGY: Forty mandibular molars were used shortly after extraction. The root canals of 20 molars in the manual group were conventionally prepared using hand instruments and then filled with warm vertical compaction of gutta-percha. The 20 teeth in the second group were cleaned and obturated by NIT. In each case, the entire molar, including the crown and the roots, was embedded in an acrylic resin cylinder before NIT. Horizontal sections were cut at 2, 4, 6 and 8 mm from the apex. Images of the sections were taken using a microscope at x40 magnification and a digital camera; the images were scanned as Tagged Image File Format (TIFF) images into a PC. The cross-sectional area of the canal with the filling materials was measured using an image analysis programme. The percentage of filled area was calculated. The difference in the percentage of filled canal area between the two groups was analysed using a Student's t-test. RESULTS: At all levels, 93-100% of the canal area was filled in both groups. No significant difference was found between the manual technique and the NIT technique at any level (P>0.05). CONCLUSIONS: Within the limitations of this study, following the cleaning and filling of root canals using NIT, the percentage of filled root canal was similar to that using warm vertical compaction of gutta-percha after conventional root-canal instrumentation.

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Access to a tooth with a partial canal calcification was made. The access was possible only with a bur extensor connected to a LN bur. Calcification was bypassed, and the canal was completely prepared.

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Access to a tooth with a partial canal calcification was made. The access was possible only with a bur extensor connected to a LN bur. Calcification was bypassed, and the canal was completely prepared

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Existe una gran cantidad de referencias en la literatura odontológica acerca de los usos y efectos del hidróxido de calcio, sobre todo, aplicado a las técnicas endodónticas. En el estudio que presentamos, se usó en 105 casos clínicos, con base en el supuesto demostrado por otros acerca de su efecto biocompatible en el tratamiento de algunas patologías de origen endodóntico. Leonardo M.R., preconizó su uso como tapón apical previo a la endodoncia definitiva, en los casos llamados por él como "biopulpectomía". En esta investigación se generalizó su uso para todos los casos de dientes maduros que requerían endodoncia, en los cuales independientemente del diagnóstico, se obtuvo un éxito significativo (93,4 por ciento), mejorando las características del cemento, lo cual permite recomendarlo en la técnica endodóntica rutinaria agregado como elemento sellador

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O presente estudo tratou de avaliar a eficiência dos métodos de remoçäo do tecido pulpar vivo do interior do canal radicular, de três formas distintas: a simples penetraçäo com lima tipo K ou H; a pulpectomia completa executada, segundo Paiva & Antoniazzi, por exérese em canais amplos e esmagamento em canais estreitos; e com brocas tipo Gattes. As três técnicas foram utilizadas em dentes anteriores e posteriores, que, após extraídos, foram fixados, descalcificados pelo ácido fórmico e processados histologicamente, para a obtençäo de cortes seriados dos níveis apical, médio e cervical, e corados pela hematoxilina-eosina. Após a análise sob o microscópio óptico, pôde-se observar que nenhuma das técnicas foi capaz de remover todo o conteúdo pulpar dos canais radiculares, sendo, porém a exérese e o esmagamento os mais eficientes, seguidos da técnica que utiliza a broca de Gattes

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Our purpose was to compare incidence of post-surgical pain associated to the endodontic therapy where the instrumentation on the root canal was performed by the method of Marshall & Pappin and the method of Marshall & Pappin complemented by the ultrasonic. Seventy patients with only one tooth needing endodontic treatment were treated by one of the methods and, posteriorly, evaluated. The endodontic treatment was performed at one time and from the seventy teeth, thirty have been instrumented by the manual method complemented by the ultrasonic and forty by the manual instrumentation. The patients were clinically controlled after the endodontic treatment was finished during periods of 24, 48 and 72 hours to evaluate their post-surgical condition. The results suggest that were no statistically significant differences (p less than 0.05) in the incidence of pain between the employed methods or according to the pulpar semiologic condition in any of the observed periods. However, we have realized that there was a tendency for a smaller percentage of a postoperative pain in those cases of necropulpectamy treated by the endosonic ultrasonic synergistic system. In those cases of biopulpectomy this has been not observed.

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