Push-out bond strength of different tricalcium silicate-based filling materials to root dentin

Abstract

Push-out bond strength of different tricalcium silicate-based filling materials to root dentin Abstract: The aim of this study was to evaluate the bond strength of different triccalcium silicate cements to retrograde cavity using a push out test. Thirty maxillary central incisors were shaped using #80 hand files and sectioned transversally. Root slices were obtained from the apical 4 mm after eliminating the apical extremity. The specimens were embedded in acrylic resin and positioned at 45° to the horizontal plane for preparation of root-end cavities with a diamond ultrasonic retrotip. The samples were divided into three groups according to the root-end filling material (n = 10): MTA Angelus, ProRoot MTA and Biodentine. A gutta-percha cone (#80) was tugged-back at the limit between the canal and the root-end cavity. The root-end cavity was filled and the gutta-percha cone was removed after complete setting of the materials. The specimens were placed in an Instron machine with the root-end filling turned downwards. The push-out shaft was inserted in the space previously occupied by the gutta-percha cone and push out testing was performed at a crosshead speed of 1.0 mm/min. There was no statistically significant difference in resistance to push out by the materials tested (p > 0.01). MTA Angelus and ProRoot MTA showed predominantly mixed failure while Biodentine exhibited mixed and cohesive failures. The tricalcium silicate-based root-end filling materials showed similar bond strength retrograde cavity.

The push-out bond strength of BIOfactor mineral trioxide aggregate, a novel root repair material

“…The results of the present study indicated similar bond strength values for the MTA-Angelus, Biodentine, and BIOfactor MTA. Our findings are in agreement with previous research that revealed no significant differences between the bond strengths of the MTA-Angelus and Biodentine [24]. The similarities in the bond strengths among these calcium-silicate based materials may be due to the similarities in their basic composition, according to the manufacturers’ information.…”

“…The cohesive failure percentage in the Biodentine group was the highest in our study, and previous studies have shown that the Biodentine-dentin bond failures were predominantly cohesive [313233]. However, there are conflicting results for the MTA-Angelus; some previous studies reported adhesive failures [3134], while other revealed mixed failures [24]. The differences in the MTA-Angelus failure modes could be attributed to the new methodological design used in the present study or different storage conditions.…”

Evaluation of the dislodgement resistance of bioceramic reparative cements placed in a retrograde cavity using a different technique

“…Regarding the type of failure, mixed failure was predominated, in accordance with the results of the previous studies 20,29 which means failure is related with not only in the bond with the radicular dentin (adhesive failures) but also the material itself (cohesive failures). In line with the presented study results, Formosa et al 20 comparing the bond strength of MTA Plus which was mixed with different liquids (light-curing resin, chemical curing resin, antiwashout gel, distilled water) have found failure was significantly higher in the distilled water mixing group.…”

“…The lack of consistency may have caused more ion release during the setting period. This situation as stated in previous studies 29,30 results in an uneven and porous microstructure, which disrupts the material structure and prevents material cohesion, and may be the cause of excess cohesive failure observed in the present study.…”

Bioactive Materials for Direct and Indirect Restorations: Concepts and Applications

“…The liquid to be mixed with the cement powder contains calcium chloride significantly reduces its setting-time in comparison to MTA, and a water-soluble polymer in the composition acts as a water-reducing agent, in addition to sodium and magnesium (91,92). According to Stefaneli Marques et al (93), Biodentine has physicochemical properties similar to Portland cement. Moreover, the biocompatibility and bioactivity promoted by this cement are similar to that of MTA, making both cements, the main choice for several conservative therapies involving the dentin-pulp complex (94,95).…”