The influence of methodological variables on the push‐out resistance to dislodgement of root filling materials: a meta‐regression analysis

Abstract

Collares FM, Portella FF, Rodrigues SB, Celeste RK, Leitune VCB, Samuel SMW. The influence of methodological variables on the push-out resistance to dislodgement of root filling materials: a meta-regression analysis. International Endodontic Journal, 49, 836-849, 2016. The aim of this systematic review was to evaluate the influence of several methodological variables on the push-out resistance to dislodgment of root filling materials by a meta-regression analysis of the literature. A systematic review was performed by searching the PubMed database using the terms 'push-out' and 'pushout'. Laboratory studies published before March 2015 were included. Two reviewers extracted data regarding country of origin, year of publication, tooth type, smear layer removal, root canal sealer, core material, obturation technique, sample storage, tooth portion, test machine load velocity and slice thickness. Pooled mean resistance to dislodgement of all groups from the included studies was used in a linear meta-regression of random effects (a = 0.05). Of the 850 identified studies, 53 met the inclusion criteria. A meta-regression of the 341 groups extracted from these articles was performed to analyse the influence of each variable on resistance to dislodgement (in MPa). The sealer, core material, obturation technique, slice thickness, storage time, load velocity and tooth portion significantly influence the results (P < 0.05). Irrigant solution and smear layer removal did not influence the resistance to dislodgement of the root filling materials (P > 0.05). Methodological variables such as sealer, core material, root filling technique, tooth type, tooth portion, slice thickness, storage time and load velocity influenced the resistance to dislodgment. The inclusion and standardization of all related variables could lead to a more comparable and reproducible analysis of the resistance to dislodgment of the root canal sealers.

Effect of Smear Clear and Some Other Commonly Used Irrigants on dislodgement resistance of Mineral Trioxide Aggregate to Root Dentin

“…Smear layer removal was the only factor that did not affect the push-out bond strength in the study by Collares et al (11). Pane et al (12) concluded that the push-out test might be suitable for ranking of root canal filling materials in terms of their efficacy.…”

Effect of double antibiotic and calcium hydroxide pastes on dislodgement resistance of an epoxy resin-based and two calcium silicate-based root canal sealers

“…These irregular canal anatomies cause difference between the calculated bonding area and existing bonding area, which may lead to erroneous calculations. At the same time, previous studies have shown that the use of a medicament, before filling the root canal filling, tooth section, root filling technique, slice thickness, and final irrigation protocol, may affect the bond strength [36,37,39,42].…”

Effectiveness of lateral and secondary canal filling with different endodontic sealers and obturation techniques

“…However, it has been poorly investigated [10][11][12] and it should be further compared with existing materials. The AH Plus (DeTrey Dentsply GmbH, Konstanz, Germany) is based on epoxy resin and it is considered a goldstandard material for root filling due to its long history of clinical success 6 and remarkable bond strength to dentin 13 . EndoFill (Dentsply, Petrópolis, RJ, Brazil) is another conventional sealer, which is composed of zinc oxide-eugenol and offers a long time of use and good clinical performance 6,14 .…”