Can Type of Instrumentation and Activation of the Final Irrigant Improve the Obturation Quality in Oval Root Canals? A Push-Out Bond Strength Study

Abstract

To appraise the outcome of file systems and activation of the final irrigant on the push-out bond strength of root fillings in oval canals. Single-rooted mandibular premolars (n = 180) with oval canals were divided into three groups (n = 60) for instrumentation: ProTaper Next (PTN), WaveOne (WO), and Self-adjusting File (SAF). The specimens were further divided into subgroups (n = 20) and subjected to final irrigation with activation by EndoActivator or passive ultrasonic irrigation or without activation. Then, the specimens were again subdivided (n = 10) and obturated with gutta-percha and AH Plus (GP-AH) or C-Point with EndoSequence bioceramic sealer (C-EBC). One-millimeter-thick horizontal slices were cut from the apical third of the root, 5 mm from the apex, and subjected to push-out bond strength (BS) testing. Specimens for which SAF was used exhibited higher BS values than those for which PTN or WO was used (p < 0.05). Activation of the final irrigation did not affect the BS of the root fillings. Root fillings made of C-EBC presented a higher BS than those made of GP-AH (p < 0.05). Adhesive failure was more common with specimens instrumented using PTN and WO. Root canals instrumented with SAF, showed the highest bond strength values for both root filling materials. The C-EBC produced significantly higher bond strength values than those of the GP-AH.

Effect of silver diamine fluoride activation on bond strength to root dentin

“…Recently, it was used as a final rinse after root canal cleaning and shaping and had a pronounced effect on canal disinfection, but further investigations about its effect on bond strength had to be evaluated. [ 16 ] SDF was used in this study with different activation methods to improve its access to inaccessible areas as the apical region of the root with the presence of large number of accessory canals that is hard to penetrate without activation [ 29 , 30 ]. Push-out test was the test of choice as it is a widely accepted method for recording the interfacial bond strength of endodontic materials to root dentin [ 29 – 31 ].…”

Dentin Bond Strength of Calcium Silicate-Based Materials: A Systematic Review of In Vitro Studies

“…Additionally, the application of a diode laser after conventional irrigation (NaOCl + EDTA) increased bond strength values, likely due to morphological and chemical changes in the root dentin post irradiation [17]. Conversely, activating irrigants with sonic or ultrasonic devices showed no significant effects [40].…”

“…The increased bond strength may be due to the lack of areas not instrumented. The use of SAF did not allow areas where debris was left or compacted in the recesses of the canal [40].…”

Determination of a Representative and 3D-Printable Root Canal Geometry for Endodontic Investigations and Pre-Clinical Endodontic Training—An Ex Vivo Study

“…Malentacca et al [26] x c Ni et al [61] x c Pawar et al [60] x c Peters et al [44] x c Retsas et al [43] x c Rodrigues et al [28] x x c Yekta-Michael et al [1] x c…”

“…J. 2023, 11, 133 2 of 15 during a root canal preparation as well as irrigant activation including bacterial decontamination [28,[38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56], for the analysis of the microbial behavior [57,58], for the investigation of obturation [59,60] or as input parameters for stress-strain analyses of teeth [61]. Hülsmann summarized different experimental models for studies on root canal preparation [46].…”