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[Article Of Journal] 2014 JOE : Effect of Mineral Trioxide Aggregate Surface Treatments on Morphology and Bond Strength to Comp
Effect of Mineral Trioxide Aggregate Surface Treatments on Morphology and Bond Strength to Composite Resin
Joo-Hee Shin, DDS, MSD, Phd, ji-Hyun Jang, DDS, MSD, PhD, Sang Hyuk Park, DMD, MSD, PhD, and Euiseong Kim, DDS, MSD, PhD
Introduction: The aim of this study was to evaluate the micromorphologic changes that accompany diffrent surface treatments on mineral trioxide aggregate (MTA) and their effect on the bond strength to the composite resin with 4 adhesive system
Methods: Three types of MTA cement, ProRoot MTA (WMTA)(Dentsply, Tulsa, OK), MTA Angelus (AMTA) (Angelus, Londrina, PR, Brazil), and Endocem MTA (EMTA) (Maruchi, Wonju, Korea), wete prepared and stored for a week to encourage setting. Surface treatment was performed using phosphoric acid or self-etch primer, and an untreated MTA surface was prepared as a control.
Results: for WMTA and AMTA, untreated surfaces showed an irregular crystalline plate with clusters of globular aggregate particles. For EMTA, the untreated surface presented a reticular matrix with acicular crystals. After surface treatment, superficial crystalline structures were eroded regardless of the MTA cement and adhesive system used. WMTA bonded significantly more strongly than AMTA ane EMTA, regardless of the adhesive system used. In the WMTA and AMTA groups, AdheSE One Fshowed the highest bond strength to the composite. For EMTA, no significant differences were found across adhesive system.
Conclusions: Acidic treatment of the MTA surface affected the micromorphology and the bond strength to the composite. Within the limitations of this study, using a 1-step self-etch adhesive system might result in a strong bond to WMTA when the composite resin restoration is required over MTA cement. (J Endod2014;40:1210-1216)