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At least 181 records · Page 10Linked to original sources
PubMed2003

An in vitro evaluation of the sealing ability of a new root-canal-obturation system.

In this study the sealing ability of a new urethane methacrylate resin-based sealer, EndoRez, was evaluated using a fluid-filtration model. Sixty-four single-rooted lower bicuspids were decoronated, instrumented, and divided into 3 groups of 20 each with 4 teeth used as controls. In group A, the roots were obturated with EndoRez and a single cone of gutta-percha, group B with AH Plus and a single cone of gutta-percha, and group C was obturated using gutta-percha with warm vertical compaction and AH Plus sealer. All specimens were allowed to set for 7 days in 100% humidity at 37 degrees C. The groups were compared for differences in the amount of leakage (mm/h) using a Chi-square test. The leakage of group A was significantly higher at p = 0.01 than the other two groups. There was no significant difference in leakage between groups B and C.

Bicuspid↗
PubMed1994

Comparative sealability study on root canal obturation using multiphase gutta percha and lateral condensation technique.

An in-vitro dye leakage study was performed to compare the apical microleakage of recently introduced multiphase obturation system to lateral condensation technique using methylene blue dye. Thirty single rooted human teeth were divided randomly into two equal groups. Group A were filled with multiphase technique using Tubliseal sealer and group B were filled with lateral condensation technique using the same sealer (control). Root canal preparation of both groups were carried out with nickel titanium files. Statistical analysis revealed that multiphase technique exhibited lower mean leakage (0.6) than lateral condensation technique (1.72). In addition some specimen filled with multiphase technique showed zero degree leakage.

Dental Leakage↗
PubMed1991

The effect of post space preparation on the apical seal of root canal obturated teeth.

The dental literature is contradictory about the quality of the apical seal as it relates to the length of remaining gutta-percha following post-space preparation. The purpose of this study was to compare apical leakage with varying remaining lengths of gutta-percha in an in vitro system. Fifty disarticulated single canal human mandibular premolar teeth were used in five experimental groups. All root canals were prepared 1 mm short of the apical foramen through a size 50 k-file and sequentially flared through a size 70 k-file. Four groups were obturated using gutta-percha with lateral condensation and Roth's 801 Elite Grade root canal sealer. Post-space preparation was accomplished by removing gutta-percha with heated pluggers so that the lengths of the remaining filling varied by increments of one millimeter between 3 and 7 mm. Specimens were covered with enamel paint leaving only the apical foramen exposed. All roots were then submerged in 1 percent methylene blue dye for two weeks, sectioned longitudinally, and measured for depth of dye penetration. No significant difference was found between the 4 and 5 mm groups or between the 6 and 7 mm groups. Significant difference (p less than .05) in leakage did exist between the 3, 4-5, and 6-7 mm groups, showing the least in the latter groups. The best apical seal was obtained when the maximum of 6 mm of gutta-percha remained.

Analysis of Variance↗
PubMed1994

Comparison of apical leakage in root canals obturated with various gutta percha techniques using a dye vacuum tracing method.

In this study, residual apical microlumina remaining after obturation with five different gutta-percha obturation methods were traced with an efficient vacuum method. Seventy-nine human maxillary anterior teeth were instrumented and divided into five groups. The groups were obturated with single-cone techniques, lateral condensation, vertical condensation, Thermafil, and Ultrafil techniques. All specimens were immersed in a vacuum flask containing 2% methylene blue dye solution. The air was evacuated with a vacuum pump to an absolute pressure of 75 torr for 30 min. The roots were sectioned longitudinally and the linear extent of dye penetration was measured. Group mean linear dye penetration values were: single-cone technique, 1.55 +/- 0.95 mm; lateral condensation, 2.25 +/- 1.46 mm; vertical condensation, 2.61 +/- 2.61 mm; Thermafil 1.41 +/- 1.16 mm; and Ultrafil 3.51 +/- 4.70 mm. There were no statistically significant differences between the gutta-percha obturation methods. The clinical implications of these findings are discussed.

Bismuth↗
PubMed1997

Influence of the removal of coronal gutta-percha on the seal of root canal obturations.

The purpose of this study was to compare the quality of the coronal seal of lateral and vertical condensations after removal of the coronal gutta-percha with two different techniques. One hundred single-rooted human teeth with one root canal were used. After cleaning and shaping, the teeth were divided into 4 equal groups. In groups 1, 3 and 2, 4 vertical and lateral condensations were performed respectively. Then, the coronal portion of gutta-percha was removed with heat-carriers alone for groups 1 and 2 and with heat-carriers and compaction for groups 3 and 4. Apical microleakage was determined using pressurized fluid filtration measured at different time intervals up to 24 wk. The results showed that the alternation of heat-carriers and compaction enhances the quality of the coronal seal. The obturation with the vertical condensation technique resulted in a better seal independently of the gutta-percha removal technique.

Analysis of Variance↗
PubMed1994

Electrochemical microleakage assessment of three different root canal obturation techniques.

This study compared microleakage of lateral condensation, Thermafil and multiphase gutta-percha obturation technique using an electrochemical test system. The mean leakage current of three obturation techniques compared with that of positive samples. It was found that, the multiphase gutta-percha showed the least mean leakage current followed by Thermafil and lateral condensation techniques.

Dental Leakage↗
PubMed1994

Review of a new root canal obturation technique.

The relatively new technique of obturation using Thermafil endodontic obturators is claimed by the manufacturers to use gutta percha of a more linear structure than conventional gutta percha, and so provide a seal at least equal to laterally condensed material. In this article the authors describe the practical use of this widely marketed technique. Studies which have so far evaluated this technique are reviewed and its advantages and shortcomings discussed.

Gutta-Percha↗
PubMed2005

Effectiveness of resin-coated gutta-percha cones and a dual-cured, hydrophilic methacrylate resin-based sealer in obturating root canals.

The introduction of a polybutadiene-diisocyanate-methacylate resin-coating of gutta-percha enables the polyisoprene to be chemically coupled to methacrylate-based resin root canal sealers. This study examined the effectiveness of using passively fitting cones of this type of gutta-percha with a dual-cured version of EndoREZ sealer in obturating cleaned and shaped root canals. The hydrophilic nature of the sealer enabled the creation of an extensive network of 800 to 1200 mum long sealer resin tags after removal of the endodontic smear layer. Although no adhesive was employed, thin hybrid layers in root dentin were observed when EDTA was used as the final rinse. Nevertheless, interfacial gaps and silver leakage could be observed along the sealer-dentin interfaces that might be attributed predominantly to polymerization shrinkage of the sealer. Gaps and silver leakage were also identified between the gutta-percha resin-coating and the sealer.

Bicuspid↗
PubMed2006

Effects of different root canal obturation techniques on bacterial penetration.

OBJECTIVES: The aim of this study was to compare bacterial penetration following obturation with 5 different techniques. STUDY DESIGN: This study was performed on 120 teeth including negative control (n = 10), positive control (n = 10), and experimental groups (n = 100). One hundred teeth were randomly divided into 5 groups of 20 teeth each and obturated with System B (Sb), Lateral Compaction (Lc), Thermafil (T), Single ProTaper Gutta-percha (P), and laterally compacted ProTaper Gutta-percha (PLc). Enterococcus faecalis was used for determination of the bacterial penetration. Evaluation was carried out for 60 days. RESULTS: At 30 days, the chi2 test showed that the slowest penetration was observed in Group Sb and Group PLc, which were not significantly different from each other. The fastest penetration in the all experimental groups was observed in Group T and Group P, which were not significantly different from one another. Also, there was no statistically significance difference (P > .05) among all groups at 60 days. CONCLUSION: It may be concluded that under the conditions of this study System B and laterally compacted ProTaper Gutta-percha prevent bacterial penetration of the root canal at 30 days. Furthermore, there was no difference among obturation techniques at 60 days.

Colony Count, Microbial↗