Abstract
The influence of root canal filling techniques on the penetration of AH Plus into dentinal tubules was evaluated using confocal laser scanning microscopy (CLSM) and the impact on the bond strength of the filling material on the root dentin was evaluated using the push-out test. Roots of the maxillary central incisors (n=40) were prepared with ProTaper Universal and assigned to four groups: lateral condensation, vertical compaction, modified Tagger hybrid and single cone. After root canal filling with gutta-percha and AH Plus, along with the addition of 0.01% fluorescein, the roots were cut into 2-mm slices. CLSM was performed on the first slice of each root third, followed by the push-out test. The second slice was analyzed under SEM. ANOVA demonstrated a statistically significant difference between the root canal filling techniques and the root thirds (p<0.05). For percent penetration, Tukey's test showed that the vertical compaction (91.77±13.51), lateral condensation (89.18±10.91) and modified Tagger hybrid (87.53±15.42) presented the highest values, which significantly differed (p<0.05) from those of the single cone (78.19±22.46). For bond strength (MPa), lateral condensation (3.42±0.54) and vertical compaction (3.47±0.53) had the highest values (p<0.05), while the modified Tagger hybrid (2.19±0.41) and single cone (0.54±0.21) had the lowest. In conclusion, the lateral condensation, vertical compaction and Modified Tagger's hybrid techniques resulted in greater penetration and bond strength to the intra-radicular dentin.
Highlights
The penetration of endodontic sealers into dentinal tubules and bond strength to the dentin is directly associated with the removal of smear layers [1,2], physical and chemical properties of the sealer [3] and root canal filling technique [4].Different root canal filling techniques have been proposed [5,6] as attempt to fill the root canal in three dimensions [7] and reduce marginal apical and coronal infiltration [8]
Because the root canal filling technique may interfere with the quality of the root canal filling, it is important to analyze the influence of the lateral condensation, vertical compaction and modified Tagger hybrid techniques on the penetration and bond strength of the cement in an epoxy resin-based sealer adhering to the root dentin
This study evaluated the impact of the lateral condensation, vertical compaction, modified Tagger hybrid and single cone root canal filling techniques on penetration to the root dentin and bond strength to the root canal wall when the AH Plus sealer was used
Summary
Different root canal filling techniques have been proposed [5,6] as attempt to fill the root canal in three dimensions [7] and reduce marginal apical and coronal infiltration [8]. Among these techniques, lateral condensation, which is the most commonly used technique, is worth mentioning [7] and warm vertical compaction, which promotes plastification of gutta-percha to provide homogeneity of the obturating mass and better adaptation to the root canal walls [9]. Because the root canal filling technique may interfere with the quality of the root canal filling, it is important to analyze the influence of the lateral condensation, vertical compaction and modified Tagger hybrid techniques on the penetration and bond strength of the cement in an epoxy resin-based sealer adhering to the root dentin
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