Effect of thermoplastic filling techniques on the push-out strength of root sealing materials

Abstract

This study evaluates the effect of two thermoplastic obturation systems (MicroSeal and Obtura II) on bond strength of different sealers to intraradicular dentin. Sixty root canals of human canines were prepared using ProTaper rotary files (crown-down technique) and irrigated with 2.5% sodium hypochlorite and 17% EDTA. The root canals were filled by MicroSeal, Obtura II, or lateral compaction techniques using AH Plus and Epiphany SE. 1.5 mm thick root slices were subjected to the push-out test. ANOVA and Tukey's test showed that the bond strength values (MPa) observed in the groups obturated with MicroSeal (2.96 ± 2.72) and Obtura II (2.68 ± 2.18) did not significantly differ from each other (p > 0.05) but were significantly higher than that observed in the group obturated with lateral condensation (2.01 ± 1.48; p < 0.05). There were no statistically significant differences in strength (p > 0.05) among the root canal thirds (cervical: 2.44 ± 2.03; middle: 2.50 ± 2.27; and apical: 2.70 ± 2.34). Adhesive failures were predominant (60%) in all groups. In conclusion, MicroSeal and Obtura II techniques, using AH plus sealer, increased the resistance to displacement of the filling material, when compared with lateral compaction. Moreover, when used with Epiphany SE, these obturation systems did not affect the bond strength of the material to root dentin.

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

“…Materials and instruments are continuously incorporated into endodontic practice, resulting in the adoption of new root filling protocols and techniques (Horiuchi et al 2016, Sch€ afer et al 2016. Ultrasonic activation (Guimarães et al 2014, Arslan et al 2016) and sonic activation (Arslan et al 2016) of canal sealers have been proposed to increase their penetration into the dentinal tubules and improve the interfacial adaptation between the material and root dentine.…”

Effect of sonic and ultrasonic activation on physicochemical properties of root canal sealers

“…1,2 The quality of obturations is directly related to the material and the technique employed. [2][3][4][5][6] Regarding root canal filling techniques, lateral condensation presents some limitations in irregular, flat, and complex root canal systems. 3 4,6,7,9 Recent studies have demonstrated the presence of gaps and voids after the use of different root canal filling techniques.…”

Impacto da ativação sônica e ultrassônica do cimento obturador dos canais radiculares na adaptação e resistência de união à dentina

“…Avaliação qualitativa da interface cimento/dentina por meio de microscopia confocal de varredura a laser (CARNEIRO et al, 2012;GUIMARÃES et al, 2014;SOO et al, 2015;VIAPIANA et al, 2015;HORIUCHI et al, 2016;SCHÄFER et al, 2016). Além da técnica de condensação lateral, surgiram as técnicas termomecânicas (LEONARDO et al, 2009;MICHELOTTO et al, 2010;CARNEIRO et al, 2012), termoplásticas (GOLDBERG et al, 2001CATHRO;LOVE, 2003;KARABUCAK et al, 2008;HORIUCHI et al, 2016) e, mais recentemente, foi proposta a ativação ultrassônica do cimento obturador (GUIMARÃES et al, 2014).…”

“…A obturação do sistema de canais radiculares deve propiciar adequado selamento a fim de impedir a percolação de fluidos para o interior do canal e prevenir a reinfecção, dando condições para que ocorra o reparo da região apical e periapical (ELDENIZ; ORSTAVIK, 2009;GUIMARÃES et al, 2014;OZKOCAK;SONAT, 2015). Nesse sentido, a qualidade da obturação está relacionada com o material e com a técnica obturadora empregada (OZKOCAK; SONAT, 2015;SOO et al, 2015;VIAPIANA et al, 2015;HORIUCHI et al, 2016;SCHÄFER et al, 2016).…”

“…Diante disso foram propostas, ao longo dos anos, diversas técnicas obturadoras, entre elas as termomecânicas que promovem condensação apical e lateral do material obturador contra as paredes do canal favorecendo o preenchimento homogêneo das irregularidades e canais acessórios (LEONARDO et al, 2009;MICHELOTTO et al, 2010). Já as termoplásticas promovem a plastificação da guta-percha formando massa homogênea compactada em direção à região apical propiciando o selamento apical, por meio do preenchimento do sistema de canais com maior homogeneidade do material obturador (GOLDBERG et al, 2001;CATHRO;LOVE, 2003;KARABUCAK et al, 2008;HORIUCHI et al, 2016).…”