Factors influencing the outcome of nonsurgical root canal treatment and retreatment: A retrospective study.

This study assessed the influence of diverse variables on the outcome of nonsurgical root canal treatment/retreatment. In general, 304 teeth from 218 patients were treated/retreated and the outcome evaluated by the periapical index (PAI). Teeth with apical periodontitis lesions that have not completely healed were classified as success or failure based on lenient and rigid criteria, respectively. Findings were evaluated using a logistic regression analysis. The overall success rates were 74% and 82% using the PAI-rigid and lenient success criteria, respectively. Specifically for treatment, the success rates were 73% (rigid) and 82% (lenient), while for retreatment they were 78% (rigid) and 83% (lenient). The treatment outcome was negatively affected by overextension, presence of preoperative lesion, lesion size >10 mm, and higher number of treatment visits (with no intracanal medication). Regarding retreatment, the chance of success was greater for teeth with adequate coronal restorations.

Effects of Calcium Hydroxide Paste in Different Vehicles on Bacterial Reduction during Treatment of Teeth with Apical Periodontitis.

INTRODUCTION: This clinical study evaluated the antibacterial effects of calcium hydroxide associated with different vehicles during the treatment of infected teeth with apical periodontitis. METHODS: Bacteriologic samples were taken from 90 necrotic root canals of teeth with apical periodontitis before (S1) and after preparation with a rotary nickel-titanium instrument system and 2.5% sodium hypochlorite irrigation (S2). The teeth were distributed in 3 groups according to the intracanal medication used, which consisted of a calcium hydroxide paste in glycerin, camphorated paramonochlorophenol/glycerin (CHPG), or 2% chlorhexidine for 1 week, and then another sample was taken (S3). The frequency of bacteria-positive cases and the reduction of bacterial counts were evaluated by quantitative real-time polymerase chain reaction. RESULTS: Substantial intracanal bacterial reduction was observed after preparation in the 3 groups (P < .001). After calcium hydroxide paste in glycerin medication, the number of bacteria-positive cases decreased from 20/29 (69%) to 17/29 (59%); however, the mean bacterial counts increased 8.4% from S2 to S3. Medication with CHPG reduced the number of bacteria-positive cases from 17/29 (59%) to 15/29 (52%), with a significant mean S2-S3 reduction of 71% (P < .05). In the chlorhexidine group, the number of bacteria-positive cases decreased from 21/30 (70%) to 17/30 (57%) after medication, with a mean S2-S3 reduction of 55%, which, however, was not statistically significant (P > .05). Intergroup comparisons showed no significant differences (P > .05). CONCLUSION: Comparison between the 3 calcium hydroxide pastes showed no significant differences in antibacterial effectiveness in the main root canal. However, only the CHPG paste showed a significant reduction in bacterial counts when postpreparation and postmedication samples were compared.

Disinfection and outcome of root canal treatment using single-file or multifile systems and Ca(OH)2 medication.

This clinical study reports on the antibacterial effects and outcome of endodontic treatment using either a single-file or a multifile system, associated with calcium hydroxide interappointment medication. The root canals of single-rooted teeth with apical periodontitis were treated by using either Reciproc or BioRaCe instrument systems, 2.5% NaOCl irrigation, and calcium hydroxide medication. Bacteriological samples taken before preparation and immediately before obturation were evaluated for total bacterial counts by quantitative real-time polymerase chain reaction (qPCR). Patients were followed up and the treatment outcome was assessed by clinical and radiographic criteria. Decreasing lesions were classified as success in a lenient criterion or failure in a rigid one. Bacteria were detected in all initial samples (47 cases) and were significantly reduced after treatment in both groups (p<0.001). In the Reciproc and BioRaCe groups, 7/25 (28%) and 11/22 (50%) root canals yielded negative qPCR results before obturation, respectively (p>0.05). Quantitative bacterial reduction was similar between groups (p>0.05). The success rate in the BioRaCe group was 95.5% and 77% in the loose and rigid criterion, respectively. In the Reciproc group, corresponding figures were 88% and 76%. Differences in outcome were not significant (p>0.05). No diseased case showed negative qPCR results for bacteria. A difference of >1 Log10 counts was observed between healed and diseased cases. Root canal treatments of teeth with apical periodontitis using a single-file or a multifile system for preparation, associated with NaOCl irrigation and calcium hydroxide interappointment medication, showed similar antibacterial effectiveness and success rate.

Disinfection and outcome of root canal treatment using single-file or multifile systems and Ca(OH)2 medication

Abstract This clinical study reports on the antibacterial effects and outcome of endodontic treatment using either a single-file or a multifile system, associated with calcium hydroxide interappointment medication. The root canals of single-rooted teeth with apical periodontitis were treated by using either Reciproc or BioRaCe instrument systems, 2.5% NaOCl irrigation, and calcium hydroxide medication. Bacteriological samples taken before preparation and immediately before obturation were evaluated for total bacterial counts by quantitative real-time polymerase chain reaction (qPCR). Patients were followed up and the treatment outcome was assessed by clinical and radiographic criteria. Decreasing lesions were classified as success in a lenient criterion or failure in a rigid one. Bacteria were detected in all initial samples (47 cases) and were significantly reduced after treatment in both groups (p<0.001). In the Reciproc and BioRaCe groups, 7/25 (28%) and 11/22 (50%) root canals yielded negative qPCR results before obturation, respectively (p>0.05). Quantitative bacterial reduction was similar between groups (p>0.05). The success rate in the BioRaCe group was 95.5% and 77% in the loose and rigid criterion, respectively. In the Reciproc group, corresponding figures were 88% and 76%. Differences in outcome were not significant (p>0.05). No diseased case showed negative qPCR results for bacteria. A difference of >1 Log10 counts was observed between healed and diseased cases. Root canal treatments of teeth with apical periodontitis using a single-file or a multifile system for preparation, associated with NaOCl irrigation and calcium hydroxide interappointment medication, showed similar antibacterial effectiveness and success rate.

Resumo Este estudo clínico relata os efeitos antibacterianos e o resultado de tratamentos endodônticos usando um sistema de instrumentação de instrumento único ou de múltiplos instrumentos, associado à medicação intracanal com hidróxido de cálcio. Os canais radiculares de 80 dentes unirradiculares com lesão perirradicular foram tratados com os sistemas Reciproc ou BioRaCe, irrigação com NaOCl a 2,5% e medicação com pasta de hidróxido de cálcio por 7 a 10 dias. Amostras bacteriológicas foram colhidas antes do preparo e imediatamente antes da obturação e examinadas quanto à contagem total de bactérias pela reação em cadeia da polimerase em tempo real quantitativa (qPCR). Os pacientes foram acompanhados e o resultado do tratamento foi avaliado por critérios clínicos e radiográficos (índice periapical). Os casos com lesões que diminuíram mas não desapareceram foram classificados como sucesso em um critério leniente ou fracasso em um critério rígido. Quarenta e sete pacientes estavam disponíveis para avaliação bacteriológica e de resultados. Bactérias foram detectadas em todas as amostras iniciais desses casos e foram significativamente reduzidas após o tratamento nos dois grupos (p<0,001). Nos grupos Reciproc e BioRaCe, os canais radiculares apresentaram resultados negativos na qPCR em 7/25 (28%) e 11/22 (50%) casos antes da obturação, respectivamente (p>0,05). A redução bacteriana foi semelhante entre os grupos (p>0,05). O período médio (mediana) de acompanhamento foi de 20,5 (18,5) meses para BioRaCe e 17,4 (18) meses para Reciproc (p>0,05). No grupo BioRaCe, a taxa de sucesso foi de 95,5% e 77% nos critérios leniente e rígido, respectivamente. No grupo Reciproc, os valores correspondentes foram 88% e 76%. As diferenças no resultado não foram estatisticamente significativas (p>0,05). Nenhum caso de doença pós-tratamento mostrou resultados negativos de qPCR para bactérias. Foi observada uma diferença >1 Log10 nas contagens bacterianas entre os casos curados e doentes. O tratamento do canal radicular de dentes com lesão perirradicular utilizando um sistema de instrumento único ou múltiplos no preparo, associado à irrigação com NaOCl e medicação entre consultas com hidróxido de cálcio, mostrou eficácia antibacteriana e taxa de sucesso semelhantes.

Transportation assessment in artificial curved canals after instrumentation with Reciproc, Reciproc Blue, and XP-endo Shaper Systems.

AIM: In the present study, we compared the transportation of three different instrumentation systems in different levels of standardized artificial curved canals. METHODS: Sixty epoxy resin blocks containing simulated canals were divided into three groups (n = 20) according to the instrument used for canal preparation: Reciproc (REC), Reciproc Blue (REC Blue), and XP-endo Shaper (XPS). Pre- and post-instrumentation digital images of each specimen were superimposed by Photoshop software to evaluate the different amount of transportation. The Kruskal-Wallis and Wilcoxon were the non-parametric tests applied for the intergroup and intragroup analyses, respectively. The significance level was set at 5%. RESULTS: The XPS showed significantly less canal transportation than REC Blue at five levels (P < 0.05) and significantly less canal transportation at seven evaluated levels when compared with the REC (P < 0.05). REC Blue showed significant less canal transportation than REC at four of the eight evaluated levels (P < 0.05). All evaluated instruments showed a significantly higher amount of resin removal toward the inner wall compared to the outer wall of the curvature (P < 0.001). CONCLUSION: Although the XPS showed significantly less canal transportation than REC and REC Blue, all systems produced transportation from the original canal anatomy.

Infection Control in Teeth with Apical Periodontitis Using a Triple Antibiotic Solution or Calcium Hydroxide with Chlorhexidine: A Randomized Clinical Trial.

INTRODUCTION: This randomized clinical study compared the antibacterial effectiveness of treatment protocols using either a triple antibiotic solution (1 mg/mL) or calcium hydroxide/chlorhexidine paste as interappointment medication in infected canals of teeth with primary apical periodontitis. METHODS: The root canals of single-rooted teeth with apical periodontitis were prepared by using a reciprocating single-instrument technique with 2.5% sodium hypochlorite irrigation and then medicated for 1 week with either a triple antibiotic solution (minocycline, metronidazole, and ciprofloxacin) at 1 mg/mL (n = 24) or a calcium hydroxide paste in 2% chlorhexidine gluconate (n = 23). Samples were taken from the canal at the baseline (S1), after chemomechanical preparation (S2), and after intracanal medication (S3). DNA extracts from clinical samples were evaluated for total bacterial reduction using a 16S ribosomal RNA gene-based quantitative polymerase chain reaction assay. RESULTS: All S1 samples were positive for the presence of bacteria, and counts were substantially reduced after treatment procedures (P < .01). Bacterial levels in S2 and S3 samples did not significantly differ between groups (P > .05). S2 to S3 reduction was 97% in the antibiotic group and 39% in the calcium hydroxide/chlorhexidine group; only the former reached statistical significance (P < .01). There were significantly more quantitative polymerase chain reaction-negative S3 samples in the antibiotic group than in the calcium hydroxide group (P < .05). CONCLUSIONS: Interappointment medication with a triple antibiotic solution at the concentration of 1 mg/mL significantly improved root canal disinfection, and its effects were at least comparable with the calcium hydroxide/chlorhexidine paste. Effectiveness and easy delivery of the antibiotic solution make it an appropriate medicament as part of a disinfecting protocol for conventional nonsurgical endodontic treatment and possibly regenerative endodontic procedures.

A periodontite apical como fator de risco às manifestações sistêmicas: uma perspectiva histórica atualizada / Apical periodontitisas a risk factor to systemic manifestations: a updated historical perspective

Objetivo: O objetivo deste trabalho foi revisar a literatura científica pertinente, dando enfoque ao tratamento endodôntico e dentes portadores de necrose pulpar associados à periodontite apical como fator de risco às manifestações sistêmicas, desde a teoria da infecção focal até os dias atuais. Metodologia: Empregou-se fontes de catalogação bibliográfica identificadas eletronicamente pelo MEDLINE, até setembro de 2018. Os artigos relacionados pela busca eletrônica foram selecionados, por três revisores independentes, avaliando os critérios de inclusão e exclusão. Resultados: A busca apresentou 107 artigos, sendo que destes, 17 estudos satisfizeram os critérios de inclusão, o que possibilitou a análise dos dados. Conclusão: Muitos dos preceitos da teoria da infecção focal estão sendo reerguidos por pesquisas que mostram cada vez mais a existência de associações entre patologias endodônticas e sistêmicas.

Objective: The aim of this work was to review the pertinent scientific literature, focusing on endodontic treatment and teeth with pulp necrosis associated with apical periodontitis as a risk factor for systemic manifestations, from the focal infection theory to the present day. Methodology: The sources of bibliographic cataloging electronically identified by MEDLINE were used until September 2018. Articles related to the electronic search were selected by three independent reviewers, evaluating the inclusion and exclusion criteria. Results: The search presented 107 articles, of which, 17 studies met the inclusion criteria, which made it possible to analyze the data. Conclusion: Many of the precepts of the focal infection theory are being reinstated by research that increasingly shows the existence of associations between endodontic and systemic pathologies.

Influência da conicidade e do ponto de imobilização na flexibilidade dos instrumentos de níquel-titânio rotatórios RaCe / Influence of taper and immobilization point on the flexibility of RaCe nickel-titanium rotary instruments

Objetivo: esse estudo comparou a flexibilidade de instrumentos de níquel-titânio rotatórios com diferentes conicidades, em diferentes diâmetros da haste helicoidal cônica (D3 e D6). Métodos: trinta instrumentos RaCe (FKG, La Chaux-de Fonds, Suíça), #40 (D0 = 40), com 25 mm de comprimento, foram divididos em três grupos (n = 10), de acordo com sua conicidade. No teste de flexão em cantiléver (45 graus), foram realizadas duas avaliações, com cargas aplicadas, em D3 e D6, para cada grupo. Resultados: a comparação das cargas aplicadas em D3 e D6 nos instrumentos RaCe com diferentes conicidades mostrou valores de carga máxima significativamente diferentes para flexionar os instrumentos: D3 < D6, com a flexibilidade em D3 maior do que em D6. A comparação das cargas aplicadas em D3 nos três grupos revelou diferenças significativas entre os grupos (p < 0,0001), enquanto o teste Student-Newman-Keuls (SNK) mostrou diferenças de flexibilidade entre os três grupos: 0,06 < 0,04 < 0,02mm/mm. O mesmo resultado foi encontrado na comparação da força aplicada em D6. Conclusões: a flexibilidade do instrumento aumenta com a redução da conicidade (p < 0,05) e diminui com o aumento no diâmetro do eixo helicoidal (p < 0,05).

Cleaning and Shaping Oval Canals with 3 Instrumentation Systems: A Correlative Micro-computed Tomographic and Histologic Study.

INTRODUCTION: The present study evaluated the cleaning and shaping ability of 3 instrumentation systems in oval canals of extracted vital teeth using a correlative analytic approach. METHODS: Oval distal canals from 33 freshly extracted mandibular molars with pulp vitality were scanned by micro-computed tomographic (micro-CT) imaging for sample selection. Specimens matched by anatomic similarities were distributed into 3 experimental groups according to the instrument system to be evaluated: the Self-Adjusting File (SAF; ReDentNOVA, Ra'anana, Israel), TRUShape (Dentsply Sirona, Tulsa, OK), and XP-endo Shaper (FKG Dentaire, La Chaux-de-Fonds, Switzerland). The irrigant was 5.25% sodium hypochlorite heated at 37°C. After rescanning with micro-CT imaging, the unprepared surface areas were identified, measured, and then histologically evaluated for the amount of pulp remnants in each root third. RESULTS: When the apical 4-mm canal segment was evaluated, the SAF exhibited significantly less unprepared areas than the XP-endo Shaper (P < .05), and there were no significant differences for the other comparisons (P > .05). Analysis of the full canal length showed no statistically significant differences between the 3 tested systems (P > .05). Likewise, the tested systems did not differ significantly in cleaning the unprepared walls (P > .05). CONCLUSIONS: There was no significant difference in the amount of unprepared surface areas between the 3 instrument systems, except for the comparison between the SAF and XP-endo Shaper in the apical 4-mm segment. None of them prepared 100% of the root canal walls. The cleaning ability of the 3 systems was similar.

Disinfecting Effects of Rotary Instrumentation with Either 2.5% Sodium Hypochlorite or 2% Chlorhexidine as the Main Irrigant: A Randomized Clinical Study.

INTRODUCTION: This randomized clinical study compared the antibacterial effects of irrigation with either 2.5% sodium hypochlorite (NaOCl) or 2% chlorhexidine (CHX) during the preparation of infected root canals with rotary nickel-titanium instruments. METHODS: The root canals of 50 single-rooted teeth with apical periodontitis were prepared by using BioRaCe rotary instruments (FKG Dentaire, La Chaux-de-Fonds, Switzerland) and irrigation with either 2.5% NaOCl (n = 25) or 2% CHX (n = 25). Samples were taken from the canal at baseline (S1) and after (S2) chemomechanical preparation. DNA was extracted from the clinical samples, and the reduction of the levels of total bacteria and streptococci was evaluated by means of a 16S ribosomal RNA gene-based quantitative polymerase chain reaction assay. RESULTS: All S1 samples were positive for the presence of bacteria. After chemomechanical preparation using either 2.5% NaOCl or 2% CHX, 44% and 40% of the root canals still had detectable bacteria, respectively. As for total bacterial counts, a mean number of 3.7 × 10(5) bacterial cell equivalents was present in S1 samples from the NaOCl group, with a substantial reduction in S2 to a mean of 5.49 × 10(2) cell equivalents (P < .001). In the CHX group, a mean bacterial load of 8.77 × 10(4) cell equivalents occurred in S1, with a significant reduction in S2 to a mean of 2.81 × 10(3) cells (P < .001). The differences in both the presence/absence and quantitative data were not statistically significant (P > .05). Both irrigation protocols were highly effective in reducing the levels of Streptococcus species (P < .001). CONCLUSIONS: No significant difference was observed for the clinical antibacterial effectiveness of rotary preparation using either 2.5% NaOCl or 2% CHX as the main irrigant.

Clinical Antibacterial Effectiveness of Root Canal Preparation with Reciprocating Single-instrument or Continuously Rotating Multi-instrument Systems.

INTRODUCTION: This in vivo study compared the antibacterial effectiveness of a reciprocating single-instrument system (Reciproc; VDW, Munich, Germany) and a rotary multi-instrument system (BioRaCe; FKG Dentaire, La Chaux-de-Fonds, Switzerland) during the preparation of infected root canals of teeth with primary apical periodontitis. METHODS: Root canals from single-rooted teeth with necrotic pulps and apical periodontitis were instrumented using either Reciproc (n = 29) or BioRaCe (n = 30) instruments under irrigation with 2.5% sodium hypochlorite. DNA was extracted from samples taken before and after preparation and subjected to quantitative analysis of total bacteria and streptococci by using the quantitative real-time polymerase chain reaction. RESULTS: All initial samples were positive for the presence of bacteria, with median numbers of 7.1 × 10(5) and 1.31 × 10(5) bacterial cells for the Reciproc and BioRaCe groups, respectively. After preparation with Reciproc and BioRaCe, 16 (55%) and 15 (50%) root canals still had detectable bacteria with median counts of 7.05 × 10(2) and 6.03 × 10(1), respectively. Both systems were highly effective in reducing the total bacterial counts (P < .001), and there were no significant differences between them (P > .05). Streptococci were highly frequent, and both systems succeeded in significantly reducing their levels (P < .001). CONCLUSIONS: Both reciprocating single-instrument and rotary multi-instrument systems were highly effective in reducing the counts of total bacteria and streptococci in root canals of teeth with apical periodontitis. Regardless of the system used, approximately one half of the teeth still had detectable bacteria.

Susceptibility of as-yet-uncultivated and difficult-to-culture bacteria to chemomechanical procedures.

INTRODUCTION: A significant portion of the bacteria taking part of the microbiome associated with apical periodontitis still remain to be cultivated and phenotypically characterized. This molecular study evaluated the prevalence of selected as-yet-uncultivated and difficult-to-culture bacterial taxa in infected root canals and their susceptibility to chemomechanical procedures. METHODS: Root canals of single-rooted teeth with apical periodontitis were prepared using rotary nickel-titanium instruments and 2.5% sodium hypochlorite as the irrigant. DNA extracts from samples taken before (S1) and after (S2) chemomechanical preparation were surveyed for the presence of 7 as-yet-uncultivated phylotypes and 1 difficult-to-culture species using end-point polymerase chain reaction. Samples were also subjected to quantitative analysis of total bacteria and levels of the 2 most prevalent taxa. RESULTS: Bacteroidaceae sp. HOT-272 (24%) and Fretibacterium fastidiosum (20%) were the most prevalent taxa in S1. Their mean counts in S1 were 8.25 × 10(3) and 2.13 × 10(3) rRNA gene copies, corresponding to 0.18% and 0.55% of the total bacteria. Chemomechanical debridement promoted a highly statistically significant reduction in total bacterial counts (P < .001), but 64% of the canals were still positive for bacterial presence. Of the target taxa, only Bacteroidaceae sp. HOT-272 and F. fastidiosum were detected in S2 (each one in 1 sample). The reduction in counts of both taxa was also highly significant (P < .001). CONCLUSIONS: Findings confirmed that several as-yet-uncultivated and difficult-to-grow bacterial taxa can participate in the microbiome associated with apical periodontitis. Two of them were found in relatively high prevalence but rarely as a dominant species. Chemomechanical procedures were highly effective in completely eliminating these taxa or at least substantially reducing their numbers.

Antibiofilm and antibacterial activities of farnesol and xylitol as potential endodontic irrigants.

This study investigated the antibiofilm and antibacterial effects of farnesol and xylitol in a series of experiments in order to evaluate their potential use as root canal irrigants. The following substances were tested: 0.2% farnesol; 5% and 20% xylitol; 0.2% farnesol plus 20% xylitol; and saline (control). For comparison with an established endodontic irrigant, 2.5% NaOCl was included in each test. Three experiments were conducted: the crystal violet assay, to evaluate the effects on the biofilm biomass; the dentin disinfection test, to evaluate the effects on bacterial viability in biofilms; and the root canal disinfection test, to simulate the use in the root canal environment. Farnesol was the most effective substance in reducing the biofilm biomass, followed by 20% xylitol. All substances affected bacterial viability in biofilms; farnesol showed the best results followed by the farnesol/xylitol combination. Irrigation with all substances significantly reduced the bacterial load (p<0.001), but only the farnesol/xylitol combination was significantly more effective than saline (p=0.02). NaOCl was more effective than any other substance tested in the three experiments (p<0.001). The findings demonstrated that farnesol affected both the biofilm biomass and the viability of cells in the biofilm, while 20% xylitol affected only the biofilm biomass. Although not more effective than NaOCl, the combination of these two antibiofilm substances has potential to be used in endodontics in certain situations.

Carreira proteana: revisão teórica e análise bibliométrica / Protean career: theoretical review and bibliometric analysis

Carreira Proteana é um conceito que representa uma nova configuração de carreira advinda das mudanças ocorridas no mercado de trabalho e que passaram a demandar novas formas de relacionamento entre empresa e empregados, bem como o planejamento do desenvolvimento dos profissionais. Assim sendo, este estudo objetiva realizar uma análise bibliométrica relacionada ao tema carreira proteana para melhor compreensão e conhecimento da evolução dos estudos no campo das ciências sociais, os centros de pesquisa, autores, entre outras informações relevantes para o planejamento de futuras pesquisas. A análise dos dados foi sustentada pelas abordagens de pesquisa quantitativa e qualitativa na bibliometria. Em termos qualitativos procurou-se analisar os assuntos das publicações levantadas e palavras frequentes que podem sugerir o direcionamento dos estudos publicados. Do ponto de vista quantitativo foram investigadas variáveis como número de publicações de artigos, autores, áreas temáticas, centros de pesquisa, anos das publicações, países, idiomas e citações que indicam a relevância das publicações para o desenvolvimento científico na área temática. O levantamento de artigos na base Web of Science resultou em 39 publicações relacionadas à carreira proteana, inseridos principalmente nas áreas de administração e psicologia aplicada, com predominância dos estudos e seus respectivos autores sediados nos Estados Unidos. A Universidade de Boston e o Journal of Vocational Behavior reúnem o maior número publicações. O ano de 2009 concentra maior número de publicações; sendo, no entanto, as publicações de 1995 e 2004 de Douglas T. Hall, o idealizador dessa nova abordagem de carreira, as que mais influenciaram as publicações recentes...

Protean Career is a concept that represents a new setting of orientation towards career arising from changes that took place in the labor market and that began came to demand new forms of relationships between company and employees, as well as in the planning of professional development planning. Therefore, the aim of this study aims atis a bibliometric analysis related to the protean career topic, protean career toward a better understanding and knowledge of the evolution of studies in the social sciences area, of research, institutions, authors, and other information relevant to the planning of future research. Data analysis was supported by the approaches of quantitative and qualitative research in bibliometrics. Qualitatively, we tried sought to analyze the issues raised and publications surveyed, for topics and frequent words that may might suggest the direction of the published studies. From the quantitative point of view, were investigated variables such as: number of source of publication numberss, authors, topic areas, research institutions, publications of the years, countriescountries, languages, and quotes that show the relevance of the publications to the scientific development in the subject area. The collectionsurvey of articles based oin the Web of Science database resulted in 39 publications related to the protean career, set primarily in the areas of management and applied psychology, with a predominance of studies and their authors based in the United States. The Boston University and the Journal of Vocational Behavior gather hold as manythe largest number of publications. The year 2009 focuses moreshows the highest concentration of publications, being, however,although the publications of from 1995 and 2004 by Douglas T. Hall, the creator of this new approach to career, are the most influential on recent publications...

Carreira proteana: revisão teórica e análise bibliométrica / Protean career: theoretical review and bibliometric analysis

Carreira Proteana é um conceito que representa uma nova configuração de carreira advinda das mudanças ocorridas no mercado de trabalho e que passaram a demandar novas formas de relacionamento entre empresa e empregados, bem como o planejamento do desenvolvimento dos profissionais. Assim sendo, este estudo objetiva realizar uma análise bibliométrica relacionada ao tema carreira proteana para melhor compreensão e conhecimento da evolução dos estudos no campo das ciências sociais, os centros de pesquisa, autores, entre outras informações relevantes para o planejamento de futuras pesquisas. A análise dos dados foi sustentada pelas abordagens de pesquisa quantitativa e qualitativa na bibliometria. Em termos qualitativos procurou-se analisar os assuntos das publicações levantadas e palavras frequentes que podem sugerir o direcionamento dos estudos publicados. Do ponto de vista quantitativo foram investigadas variáveis como número de publicações de artigos, autores, áreas temáticas, centros de pesquisa, anos das publicações, países, idiomas e citações que indicam a relevância das publicações para o desenvolvimento científico na área temática. O levantamento de artigos na base Web of Science resultou em 39 publicações relacionadas à carreira proteana, inseridos principalmente nas áreas de administração e psicologia aplicada, com predominância dos estudos e seus respectivos autores sediados nos Estados Unidos. A Universidade de Boston e o Journal of Vocational Behavior reúnem o maior número publicações. O ano de 2009 concentra maior número de publicações; sendo, no entanto, as publicações de 1995 e 2004 de Douglas T. Hall, o idealizador dessa nova abordagem de carreira, as que mais influenciaram as publicações recentes.(AU)

Protean Career is a concept that represents a new setting of orientation towards career arising from changes that took place in the labor market and that began came to demand new forms of relationships between company and employees, as well as in the planning of professional development planning. Therefore, the aim of this study aims atis a bibliometric analysis related to the protean career topic, protean career toward a better understanding and knowledge of the evolution of studies in the social sciences area, of research, institutions, authors, and other information relevant to the planning of future research. Data analysis was supported by the approaches of quantitative and qualitative research in bibliometrics. Qualitatively, we tried sought to analyze the issues raised and publications surveyed, for topics and frequent words that may might suggest the direction of the published studies. From the quantitative point of view, were investigated variables such as: number of source of publication numberss, authors, topic areas, research institutions, publications of the years, countriescountries, languages, and quotes that show the relevance of the publications to the scientific development in the subject area. The collectionsurvey of articles based oin the Web of Science database resulted in 39 publications related to the protean career, set primarily in the areas of management and applied psychology, with a predominance of studies and their authors based in the United States. The Boston University and the Journal of Vocational Behavior gather hold as manythe largest number of publications. The year 2009 focuses moreshows the highest concentration of publications, being, however,although the publications of from 1995 and 2004 by Douglas T. Hall, the creator of this new approach to career, are the most influential on recent publications.(AU)

Correlative bacteriologic and micro-computed tomographic analysis of mandibular molar mesial canals prepared by self-adjusting file, reciproc, and twisted file systems.

INTRODUCTION: This ex vivo study evaluated the disinfecting and shaping ability of 3 protocols used in the preparation of mesial root canals of mandibular molars by means of correlative bacteriologic and micro-computed tomographic (µµCT) analysis. METHODS: The mesial canals of extracted mandibular molars were contaminated with Enterococcus faecalis for 30 days and assigned to 3 groups based on their anatomic configuration as determined by µCT analysis according to the preparation technique (Self-Adjusting File [ReDent-Nova, Ra'anana, Israel], Reciproc [VDW, Munich, Germany], and Twisted File [SybronEndo, Orange, CA]). In all groups, 2.5% NaOCl was the irrigant. Canal samples were taken before (S1) and after instrumentation (S2), and bacterial quantification was performed using culture. Next, mesial roots were subjected to additional µCT analysis in order to evaluate shaping of the canals. RESULTS: All instrumentation protocols promoted a highly significant intracanal bacterial reduction (P < .001). Intergroup quantitative and qualitative comparisons disclosed no significant differences between groups (P > .05). As for shaping, no statistical difference was observed between the techniques regarding the mean percentage of volume increase, the surface area increase, the unprepared surface area, and the relative unprepared surface area (P > .05). Correlative analysis showed no statistically significant relationship between bacterial reduction and the mean percentage increase of the analyzed parameters (P > .05). CONCLUSIONS: The 3 instrumentation systems have similar disinfecting and shaping performance in the preparation of mesial canals of mandibular molars.

Antibiofilm and Antibacterial Activities of Farnesol and Xylitol as Potential Endodontic Irrigants

This study investigated the antibiofilm and antibacterial effects of farnesol and xylitol in a series of experiments in order to evaluate their potential use as root canal irrigants. The following substances were tested: 0.2% farnesol; 5% and 20% xylitol; 0.2% farnesol plus 20% xylitol; and saline (control). For comparison with an established endodontic irrigant, 2.5% NaOCl was included in each test. Three experiments were conducted: the crystal violet assay, to evaluate the effects on the biofilm biomass; the dentin disinfection test, to evaluate the effects on bacterial viability in biofilms; and the root canal disinfection test, to simulate the use in the root canal environment. Farnesol was the most effective substance in reducing the biofilm biomass, followed by 20% xylitol. All substances affected bacterial viability in biofilms; farnesol showed the best results followed by the farnesol/xylitol combination. Irrigation with all substances significantly reduced the bacterial load (p<0.001), but only the farnesol/xylitol combination was significantly more effective than saline (p=0.02). NaOCl was more effective than any other substance tested in the three experiments (p<0.001). The findings demonstrated that farnesol affected both the biofilm biomass and the viability of cells in the biofilm, while 20% xylitol affected only the biofilm biomass. Although not more effective than NaOCl, the combination of these two antibiofilm substances has potential to be used in endodontics in certain situations.

Este estudo investigou os efeitos antibiofilme e antibacteriano de farnesol e xilitol em uma série de experimentos para avaliar seu uso potencial como irrigante de canais radiculares. As seguintes substâncias foram testadas: farnesol a 0,2%; xilitol a 5% e 20%; farnesol a 0,2% combinado com xilitol a 20%; e solução salina (controle). NaOCl foi testado para comparação. Três experimentos foram conduzidos: o teste do cristal violeta para avaliar os efeitos sobre a biomassa de biofilme, o teste da desinfecção de fragmentos de dentina para avaliar os efeitos na viabilidade bacteriana nos biofilmes e o teste da desinfecção de canal radicular para simular o uso no ambiente do canal radicular. Farnesol foi o mais eficaz, seguido por xylitol a 20%. Todas as substâncias afetaram a viabilidade bacteriana nos biofilmes; farnesol mostrou os melhores resultados, seguido pela combinação farnesol/xilitol. A irrigação com todas as substâncias reduziu significativamente a carga bacteriana (p<0,001), mas somente a combinação farnesol/xilitol foi significativamente mais eficaz que a solução salina (p=0,02). NaOCl foi mais eficaz que qualquer outra substância testada nos três experimentos (p<0,001). Os achados demonstraram que farnesol afetou tanto a biomassa de biofilme quanto a viabilidade das células no biofilme, enquanto que xilitol a 20% afetou a biomassa de biofilme. Embora não mais eficazes que NaOCl, combinações dessas duas substâncias antibiofilmes têm o potencial de ser usadas na Endodontia, em determinadas situações.

Time-dependent antibacterial effects of the self-adjusting file used with two sodium hypochlorite concentrations.

INTRODUCTION: This in vitro study evaluated the time-dependent ability of the self-adjusting file (SAF) used with either of two NaOCl concentrations to reduce bacterial populations in long oval root canals. METHODS: Oval-shaped canals from extracted teeth were infected with Enterococcus faecalis for 30 days and subjected to preparation with the SAF system using continuous irrigation with either 2.5% NaOCl (n = 11) or 6% NaOCl (n = 11). Bacteriological samples were taken before preparation (baseline) and after 2, 4, and 6 minutes of SAF operation. RESULTS: Intragroup quantitative analyses revealed that the SAF operating for 2, 4, or 6 minutes yielded a highly significant bacterial reduction when compared with counts at baseline (P < .001) irrespective of the NaOCl concentration. No significant differences were found for intragroup analyses comparing the three time periods (P > .05). Likewise, intergroup quantitative analysis showed no significant difference for the SAF with 2.5% NaOCl or 6% NaOCl during 2, 4, or 6 minutes (P > .05). The incidence of positive cultures in the 2.5% NaOCl group was 6 of 11, 5 of 11, and 2 of 11 after 2, 4, and 6 minutes, respectively. Corresponding figures in the 6% NaOCl group were 4 of 11, 2 of 11, and 1 of 11. When all samples were gathered together, overall findings revealed that using the SAF for 6 minutes significantly reduced both the bacterial counts (P = .02) and the incidence of positive cultures (P = .04) when compared with 2 minutes. CONCLUSIONS: Findings revealed that the SAF promoted a significant reduction in bacterial populations even after only 2 minutes regardless of the NaOCl concentration. The most impressive results were obtained after a 6-minute operation.

Disinfecting oval-shaped root canals: effectiveness of different supplementary approaches.

INTRODUCTION: This study compared the ability of different approaches to supplement the antibacterial effects of chemomechanical preparation in oval-shaped root canals. METHODS: Long oval canals from extracted teeth infected with Enterococcus faecalis (ATCC 29212) were chemomechanically prepared up to a 40/04 rotary BioRaCe instrument using 2.5% NaOCl irrigation and then subjected to two supplementary protocols. In the passive ultrasonic irrigation (PUI)/chlorhexidine (CHX) group, canals were subjected to PUI for the activation of NaOCl followed by a final rinse with 0.2% CHX digluconate solution. In the Hedström group, canals received additional Hedström filing directed towards the buccal and lingual canal recesses. Bacteriological samples were taken before and after preparation, after PUI or Hedström instrumentation, and after CHX final rinsing. RESULTS: Chemomechanical preparation and the supplementary steps promoted a highly significant bacterial reduction (P < .001). Quantitative (reduction in levels) and qualitative (frequency of negative cultures) analyses showed that PUI alone or Hedström filing did not significantly increase bacterial reduction (P > .05). Further rinsing with CHX also failed to significantly increase bacterial elimination when compared with post-PUI samples. However, the cumulative antibacterial effects of PUI and CHX final rinse were effective in significantly reducing bacterial counts to levels below those achieved after preparation (P = .03). This combined PUI/CHX approach also resulted in a significant increase in the incidence of negative cultures (P = .04). CONCLUSIONS: Findings suggest that there may be a benefit of using the PUI for the activation of NaOCl followed by a final rinse with CHX as supplementary steps in the treatment of infected oval-shaped root canals.

Comparison of some physical properties of finger spreaders made of stainless steel or nickel-titanium alloys.

The purpose of this study was to evaluate the flexibility, shape, and surface finishing of stainless steel (SS) and nickel-titanium (NiTi) finger spreaders as well as to compare the load required to insert these spreaders along a gutta-percha point adapted to the apical segment of curved or straight artificial canals. Instrument flexibility was investigated by using a universal testing machine in the cantilever-flexibility test. Scanning electron microscopy (SEM) was used to examine the shape and surface finishing of different sizes of SS and NiTi finger spreaders. Penetration load was evaluated only for spreaders size C by using the universal testing machine in a compressive test. As for flexibility, the load needed to bend the SS finger spreader sizes A, B, C, and D was approximately 167%, 146%, 102%, and 64% greater than the respective sizes of NiTi finger spreaders. SEM analysis revealed that the instrument tips were always tapered, but with different vertices. NiTi spreaders showed tips with circumferential grooves; whereas, those from SS spreaders exhibited longitudinal grooves. NiTi finger spreaders required a significantly higher penetration load than SS spreaders. This difference was probably related to the different shapes and surface finishing of the instrument tips. Different characteristics of finger spreaders may result in different clinical performance during the lateral compaction technique.