Influence of the Method in Root Canal Filling Using Active Lateral Compaction Techniques

Abstract

The aim of this study was to evaluate, by stereomicroscopy and confocal laser microscopy, the influence of different lateral compaction methods for the obturation quality, as well as the time spent for the procedure. Thirty root canals of freshly extracted single-rooted human teeth were prepared with the ProTaper system up to F5 instrument and filled with gutta-percha and AH Plus sealer by the lateral compaction technique. The teeth were divided into 3 groups (n=10) in accordance with the method used for the lateral compaction, as follows: Manual, Mechanical and Ultrasonic. The sealers were stained with rhodamine B dye in a proportion of 0.1% per gram in weight to allow for the analysis under a confocal microscope. During the root filling procedure, the time spent was recorded with a stopwatch. The specimens were stored at 37 °C for 48 h, and then sectioned at 2, 4 and 6 mm from the apex. The percentage of gutta-percha, sealer and void areas were evaluated using a stereomicroscope and sealer penetration perimeter by confocal laser microscope. Statistical analyses were performed using the Kruskall-Wallis and Dunn tests (p<0.05). The mechanical method required a shorter time for the lateral compaction than the manual method (p<0.05). There were no significant differences (p>0.05) for the perimeter of the dentin with sealer penetration among all groups. The mechanical method showed a higher (p<0.05) percentage of gutta-percha and less sealer at the 4 mm section in comparison with the manual method. The ultrasonic group showed intermediate values. The void areas found in the root filling were similar (p>0.05) between the three methods. In conclusion, the fastest lateral compaction was achieved with the mechanical method, and all the methods showed void areas in the root filling.

Effect of ultrasonic and sonic activation of root canal sealers on the push‐out bond strength and interfacial adaptation to root canal dentine

“…Lateral compaction remains the most widely used root canal filling technique, and it is still the reference to which all other techniques are compared (Gordon et al 2005, Araujo et al 2016. However, lateral compaction may result in voids, spreader tracts, excessive amounts of sealer and poor apical density (Jarrett et al 2004, Rossetto et al 2014, which has motivated the search for techniques, materials and instruments that can provide better outcomes.…”

Root filling bond strength using reciprocating file-matched single-cones with different sealers

“…The application of compaction pressure possibly resulted in better contact between the sealer and dentin. 24 Thus, a higher linear dislocation resistance and a consequent increase in bond strength are expected when lateral compaction is used.…”

“…25 Voids can act as flaw-initiating sites during push-out testing, thereby reducing the values of bond strength. Finally, the use of accessory gutta-percha cones filled the irregularities in the root canal, 24 thereby reducing the thickness of the sealer layer and increasing retention. 11 The SEM analysis revealed a more homogeneous mass with few interfacial gaps for the lateral compaction technique, particularly with the AH Plus and MTA Fillapex sealers.…”

Filling Effectiveness and Dentinal Penetration of Endodontic Sealers: A Stereo and Confocal Laser Scanning Microscopy Study

“…After 7 days, the teeth were sectioned at 2, 4, and 6 mm from the root apex by a 0.3-mm precision saw (Isomet, Buehler Ltd, Ilinois, IL, USA) operating at 300 rpm under continuous water refrigeration, similar to Rossetto et al (12). The dentin segments containing the sealers were placed on glass slides, which were numbered and identified.…”