The effects of final irrigants on the push-out bond strength of two calcium silicate-based root canal sealers: an in vitro study.

Abstract

PurposeThe purpose of the present study was to investigate the effect of the different irrigant combinations used in final irrigation on the push-out bond strength of root canal sealers that have different compositions. Materials and MethodsIn total 60 dentinal slices in 1 mm thickness were collected from 15 extracted mandibular premolar teeth; 4 slices from each tooth. 3 canal-like artificial cavities were opened on each dentinal slice. Samples were divided into 4 experimental groups, each of which consisted of 15 samples. In group 1, samples were immersed in 5.25% NaOCl and 17% EDTA solutions respectively; in group 2, immersed in 5.25% NaOCl and 2% CHX solutions respectively; in group 3, immersed in 5.25% NaOCl, 17% EDTA and 2% CHX solutions respectively; and in group 4 immersed in distilled water. After drying with absorbent papers, each cavity in dentinal slice sample was filled with different sealer (Endoseal MTA, Tech Biosealer Endo or AH Plus). Two days later, the push-out bond examination was performed. ResultsAH Plus showed higher push-out bond strength value in two combinations (group 2 and 3) in which final irrigants contained CHX (p<0.001). Dentinal push-out bond strengths of root canal sealers from Endoseal MTA and Tech BioSealer Endo were not affected by final irrigant (p=0.965). ConclusionUsing CHX after NaOCl in final irrigant increases push-out strength of epoxy resinbased sealer but, did not create any difference in dentinal push-out bond strength of calcium silicate-based sealers.

Comparative Evaluation of the Interfacial Adhesion Ability of Single Versus Lateral Compaction Obturation Techniques Using Different Sealer Types. An in-Vitro Study

“…However, as this expansion had no effect with its thin film thickness on the LC technique, an obvious lack of significant differences between Endoseal MTA and Total Fill BC were noticed. [13] In contrary, Celik et al [50] and Silva et al [59] found lower push-out bond strength records for Endoseal MTA sealer than AH Plus. This could be because they evaluated the sealers' bond strength for cavities only generated and filled in root slices, rather than after obturating the entire canal with a gutta percha, as was done in the current investigation.…”

“…The development of covalent bonds among the epoxide rings and the amino groups in the bare collagen network of dentin, with exceptional adhesion capabilities, was attributed to the superior push-out bond strength in previous studies. [48][49][50] Furthermore, the moderate acidity of AH Plus may result in dentine self-etching as the sealer is introduced into the dentinal tubules by LC pressures, improving interfacial bonding. [28,51,52] Moreover, being chemically cured, AH Plus compensates for the polymerization shrinkage without the development of polymerization stresses.…”

“…This could be because they evaluated the sealers' bond strength for cavities only generated and filled in root slices, rather than after obturating the entire canal with a gutta percha, as was done in the current investigation. [50,59] The greater bond strength values at the apical level for all sealers and obturation procedures might be attributed to the resistance form imparted by the uniform rounded apical preparation, with a rounded cross section of the gutta-percha. Furthermore, the stronger phase, gutta percha, had a higher mass in comparison to the sealer in a specific canal cross section diameter, pushing the sealer deeper into the dentin, producing a stronger connection.…”

Evaluation of Adaptability and Push-out Bond Strength of a Novel Bio-ceramic Sealer Using Two Different Obturation Techniques. (In vitro study)

“…All samples were mechanically instrumented by rotary files up to size 40 with a continuous taper of 0.4. Although some studies used a diamond or carbide bur in preparing a simulation of a root canal to standardize the diameter of the filling material 12,[46][47][48][49] , the current study was intended to provide information in a clinically oriented setup; therefore, root canals were mechanically prepared in a manner that is commonly used by clinicians and in accordance with other studies. 6,50,51 Recapitulation was performed between each file change using a k-file of size 15, in conjunction with 1 mL of 2.5% sodium hypochlorite irrigation, using a sideperforated needle to avoid debris accumulation.…”

Push-out Bond Strength of Endoseal MTA and AH Plus Sealers After Using Apple Vinegar as Final Irrigating Solution

“…Where SD= Standard deviation of push-out bond strength value of apical section estimated from previous study (22) , and Δ 2 = effect size estimated to be 0.35 between the samples, α = Level of significance, and 1−β = Power. N= (1.96+0.84) 2 *2*(0.34) 2 / (0.35) 2 =14.79 Accordingly, 15 teeth were used in each group with total sample 60 teeth.…”