Timing for Composite Resin Placement on Mineral Trioxide Aggregate

Bond strength of a resin composite to MTA at various time intervals and with different adhesive strategies

“…Tsujimoto et al observed the interface between MTA and a composite with a scanning electron microscope and they measured the microhardness of MTA after composite placement. 10 In their study, after the application of MTA they used a temporary filling which subsequently had to be removed. In order to clean the MTA surface of the remnants of the provisional cement they used the air from the triple syringe.…”

“…7,8 Others believe that it is possible to cover MTA with a composite immediately after its application. 9,10 There is also no consensus as to the type of adhesive strategy which would give the highest bond strength between MTA and composite. Some researchers have shown that the performance of self-etch (SE) is superior to total-etch systems (TE) 9 contrary to others, who found that TE systems gave higher bond strength than SE.…”

Mineral Trioxide Aggregate: A review of clinical usage and investigations of the effects of modifying particle size

“…In one study, 136 after allowing 10 minutes for the MTA to set, a bonding agent was placed without significantly affecting the final Vickers micro-hardness or distance between the MTA and the bonding agent, compared with waiting 1 day or 7 days before placing the bonding agent. Again, this illustrates that a single-visit restoration with composite resin can be placed over MTA.…”

“…MTA-P can be restored at 10 min. 136 Therefore, the chosen parameter within the setting properties should be close to 10 min since the feature of considerable relevance to the clinician is the property of restorability.…”

“…However, there is emerging literature supporting immediate restoration, albeit with composite or GIC. 123,136 This difference between the GD and ED groups may also be a reflection on the educational CPD available on the handling and properties of MTA.…”