Does Adding Various Accelerators to Mineral Trioxide Aggregate Have a Negatively Effect on Push-Out Bond Strength?

Abstract

Objective: This study compares the effect of the white mineral trioxide aggregate (WMTA) accelerators, including disodium hydrogen orthophosphate (Na₂HPO₄; 2.5 wt%), calcium chloride (CaCl₂; 5 and 10 wt%), and KY jelly, on the push-out bond strength of WMTA. The null hypothesis was that the WMTA accelerators would not affect the push-out bond strength of WMTA. Materials and Methods: Slices (2-mm-thick) were obtained from 75 human mandibular molar distal roots. The slices were enlarged up to size 6 Gates-Glidden burs to obtain a 1.5-mm canal diameter. The slices were randomly divided into 4 experimental groups and a control group (n = 15 in each group). Freshly prepared WMTA mixture was placed into the root slices and stored at 37°C in a 100% humidified atmosphere for 60 days. The force required to dislodge the WMTA cement from the root slice was determined using a universal testing machine. The push-out bond strength was calculated. Results: Push- out bond strength of 5- and 10-wt% CaCl₂, and 2.5-wt% Na₂HPO₄ WMTA groups was significantly lower than in the KY-jelly and control groups (p < 0.05). The mean push-out bond strength of KY jelly was lower than in the control group but not statistically significant. Conclusion: The addition of KY jelly to WMTA did not have an adverse effect on the push-out bond strength of WMTA, in contrast to the other accelerators, including Na₂HPO₄ and CaCl₂, which reduced the push-out bond strength.

Does adding accelerators to Mineral Trioxide Aggregate affect the shear bond strength?

“…37 İlker ve ark. 38 hızlandırıcılar nedeniyle MTA'nın genleşme oranındaki değişikliğin, MTA'nın kök dentine push-out bağ kuvvetini…”

Effect of dentin and fiber post surface treatments with fumaric acid on the bonding ability of fiber posts

“…Smear layers are formed during post cavity preparation (Erdemir et al, 2010). A smear layer is a loosely adherent 1-5 mm stratum covering the radicular dentin surface, and contains microorganisms, infected dentin, sealer, and gutta-percha residue (Ilker, Sariyilmaz, & Cakici, 2019). A smear layer can affect the polymerization of resin luting cements and, thus, the successful bonding of a fiber post to resin cement (Hayashi et al, 2005).…”