Comparison of three obturation techniques with regard to bacterial leakage

AIM: To compare bacterial leakage in root canals obturated with the modified single-cone, lateral condensation, and continuous wave of condensation techniques. METHODS: Distobuccal root canals of maxillary molars were shaped up to ProTaper F2 and obturated with modified singlecone, lateral condensation or continuous wave of condensation technique. Two-chamber bacterial model using Enterococcus faecalis was employed for bacterial leakage evaluation for 30 days. The chi-square test was applied to evaluate differences between turbid and non-turbid samples, and the Kruskal-Wallis test was used for evaluating the time necessary for microleakage. A significance level of 5% was set for all analyses. RESULTS: The modified single-cone technique showed leakage in 73.3% of samples, lateral condensation in 66.6%, and continuous wave of condensation in 53.3%, but there were no significant differences among the groups (p>0.05). CONCLUSIONS: It can be concluded that the modified single-cone technique shows similar sealing efficacy to that of lateral condensation and continuous wave of condensation technique.

Análise do tempo de trabalho da instrumentação recíproca com lima única: waveOne e reciproc / Analysis of working time of the reciprocating single file instrumentation: WaveOne and Reciproc

O objetivo deste estudo foi analisar o tempo de trabalho necessário para a instrumentação do conduto radicular utilizando-se da instrumentação reciproca alternada com lima única: WaveOne e Reciproc, Vinte canais simulados curvos foram utilizados, onde 10 amostras foram instrumentadas pelo sistema WaveOne e 10 amostras foram instrumentadas pelo sistema Reciproc, O tempo de trabalho com e sem a adição do tempo utilizado para irrigação e exploração do conduto foi cronometrado. Os diferentes terços também foram considerados separadamente, Os dados obtidos foram analisados utilizando teste de Mann-Whitney, Kuskal-Wallis e Student- Newman-Kels (p=0,05), Os resultados apresentaram diferença significante entre os grupos em ambas as situações (com e sem tempo adicional), onde o Reciproc obteve menor tempo nos terços médio e apical do que o WaveOne, Pode-se concluir que ambos os sistemas apresentaram ser bem rápidos na instrumentação do canal radicular, contudo o sistema Reciproc foi mais rápido que o WaveOne.

The aim ofthis study was to analyze the working time for endodontic instrumentation using the reciprocating single file system: WaveOne and Heciproc. Twenty curved simulated resin root canais were used, where 10 samples were shaped using WaveOne system and 10 samples using Reciproc, The working time with and without irrigation and exploration time was recorded, The thirds were also individually consídered, The data were analyzed by Mann-Whitney, Kuskal- Wallis and Student-Newman-Kels tests (p=0,05), The results showed signifficant difference between the groups on both situations (with and without irrigation and exploration time), where time needed for instrumentation of medium and apical thirds was shorter for Reciproc group than for WaveOne qroup, It can conclude that both systems are fast on the endodontic instrumentation, but the Reciproc system is faster than the WaveOne svstem.

Efetividade de diferentes sistemas de preparo do canal radicular na eliminação de Enterococcus faecalis / Effectiveness of diferente root canal preparation systems against Enterococcus faecalis

O objetivo deste estudo consiste em avaliar a efetividade de diferentes sistemas empregados no preparo biomecânico, dentre eles: Self-adjusting file (SAF), TiLOS Anatomic Endodontic Technology System (TiLOS) e Mtwo sobre a eliminação de Enterococcus faecalis cultivados em canais radiculares. Para isso, foram selecionados 47 prés-molares inferiores humanos, os quais foram contaminados por Enterococcus faecalis (ATCC 29212) durante 21 dias e divididos em três grupos: GI - SAF com irrigação contínua; GII - EndoEze Tilos e irrigação com auxílio de agulhas NaviTip; GIII - MTwo e irrigação com NaviTip a cada troca de instrumento. A irrigação foi realizada com solução de NaOCl a 2,5%. Coletas bacterianas foram realizadas em três tempos experimentais: coleta da contaminação (S1), posterior ao preparo dos canais radiculares (S2) e após sete dias do preparo biomecânico (S3). Os dados em UFC foram submetidos aos testes ANOVA e Tukey ou Kruskal-Wallis e Dunn com P<0.05. Na análise dos resultados, foi observada redução de E.faecalis após preparo (P < .05) em todos os grupos, sem diferença significante entre os grupos (P > .05). A coleta final demonstrou aumento bacteriano similar em todos os grupos, esclarecendo a viabilidade das bactérias incubadas. Dessa forma, conclui-se que o preparo dos canais radiculares realizado com SAF, EndoEze Tilos e Mtwo contribuem na desinfecção do canal radicular, sem, todavia, eliminar o E. faecalis do sistema de canais radiculares.

The aim of this study was to evaluate the effectiveness of different chemo-mechanical systems for root canal preparation Self-adjusting File (SAF), TiLOS Anatomic Endodontic Technology System (TiLOS), and Mtwo against Enterococcus faecalis in the canal. Forty seven human mandibular bicuspids were contaminated with E. faecalis (ATCC 29212) for 21 days and divided into groups according to preparation methodÇ SAF group with continuous irrigationç TiLOS;Endo-Eze group and irrigation with a NaviTip needle Mtwo group and irrigation eith NaviTip. The irrigant used was 2.5% NaOCl. Bacterial harvests were performed after the contamination period (initial harvest), immediately post-preparation, and seven days after chemo-mechanical preparation. Data were expressed as CFU and subjected to ANOVA and Tukey or Kruskal-Wallis and Dunn tests at P < 0.05. Reduction in E.faecalis was observed after preparation (P< .05), with no significant differences between the groups (P> .05). The final harvest demonstrated statistically similar increase in the bacterial counts in all groups. Root canal preparation using SAF, TiLOS;Endo-Eze, and Mtwo systems contribute for the disinfection of the root