Abstract
Removal of MTA from dentin by applying 37% hydrochloric acid (HCl) to reduce microhardness and push-out bond strength. Forty dentin slices were filled with WMTA and divided into two groups (n = 20). Ten slices remained untreated while others were exposed to either HCl or phosphate buffer saline (PBS) and all samples were subjected to pushout test. The mode of bond failures was determined by SEM analysis. Later, twenty glass tubes were filled with WMTA and divided into two groups (n = 10). One side of tube was exposed to HCl or PBS while the other side remained untreated and the microhardness was analyzed by testing machine. HCl showed significantly lower pushout strength and microhardness values (P = 0.0001), (P = 0.0001). HCl treated samples showed mixed bond failures dominantly, while PBS samples mostly showed adhesive failures. The results of this study can suggest the 37% HCl as an effective solution to aid the removal of MTA from the dentin surfaces.
Highlights
Previous investigations have discussed the advantages of mineral trioxide aggregate (MTA) as a bioactive [1], biocompatible [2, 3], and radiopaque [4] root-end filling material which is capable of preventing microleakage [5, 6] and having antibacterial efficiency [7]
Results of the present study showed that 37% hydrochloric acid is significantly able to decrease dislodgement force of MTA in comparison with phosphate buffer saline (PBS), which is consistent with other previously mentioned studies
(1) Removing MTA from dentinal surface is of concern for clinicians especially in cases which refreshment of MTA or retreatment is required
Summary
Previous investigations have discussed the advantages of mineral trioxide aggregate (MTA) as a bioactive [1], biocompatible [2, 3], and radiopaque [4] root-end filling material which is capable of preventing microleakage [5, 6] and having antibacterial efficiency [7]. Many authors have investigated the behavior of MTA in different environments to evaluate the solubility of this cement [4, 11,12,13,14]. The impaired sealing ability of MTA was explained by the increase of porosities and voids occurring due to the acidic environment [17, 18]. This damage to the structure of cement is due to acidic corrosion which
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