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The present investigation assessed the effect of acid etching on marginal adaptation of white- and gray-colored mineral trioxide aggregate (MTA) to apical dentin using microcomputed tomography (micro-CT) and scanning electron microscopy (SEM). Sixty-four extracted single-rooted human maxillary teeth were used. Following root-end resection and apical preparation, the teeth were equally divided into four groups according to the following root end filling materials: (i) white-colored MTA (WMTA), (ii) etched WMTA (EWMTA), (iii) gray-colored MTA (GMTA) and (iv) etched GMTA (EGMTA). After 48 h, the interface between root-end filling materials and the dentinal walls was assessed using micro-CT and SEM. Data were statistically analyzed using the Kruskal-Wallis and Dunn tests. Micro-CT analysis revealed gap volumes between the apical cavity dentin walls and EGMTA, GMTA, EWMTA and WMTA of (0.007 160.004) mm 3 , (0.05360.002) mm 3 , (0.003 660.001) mm 3 and (0.005 960.002) mm 3 respectively. SEM analysis revealed gap sizes for EGMTA, WMTA, EWMTA and GMTA to be (492.3613.8) mm, (594.5617.12) mm, (543.1615.33) mm and (910.7626.2) mm respectively. A significant difference in gap size between root end preparations filled with GMTA and EGMTA was found (P,0.05). No significance difference in gap size between WMTA and EWMTA were found in either SEM or micro-CT analysis. In conclusion, pre-etching of apical dentin can provide a better seal for GMTA but not for WMTA.
The present investigation assess the the effect of acid etching on marginal adaptation of white- and gray-colored mineral trioxide aggregate (MTA) to apical dentin using microcomputed tomography (micro-CT) and scanning electron microscopy (SEM). Sixty-four extracted single- rooted human maxillary teeth were used. Following root-end resection and apical preparation, the teeth were equally divided into four groups according to the following root end filling materials: (i) white-colored MTA (WMTA), (ii) etched WMTA ( After 48 h, the interface between root-end filling materials and the dentinal walls were assessed using micro-CT and SEM. Data were (ETA), gray-colored MTA (GMTA) Mated analysis using the Kruskal-Wallis and Dunn tests. Micro-CT analysis revealed gap volumes between the apical cavity dentin walls and EGMTA, GMTA, EWMTA and WMTA of (0.007 160.004) mm 3, (0.05360.002) mm 3, 660.001) mm 3 and (0.005 960.002) mm 3 respectively. SEM Analysis revealed gap sizes for EGMTA, WMTA, EWMTA and GMTA to be (492.3613.8) mm, (594.5617.12) mm, (543.1615.33) mm and (910.7626.2) mm respectively. A significant difference in gap size between The final end preparations filled with GMTA and EGMTA were found (P, 0.05). No significance difference in gap size between WMTA and EWMTA were found in either SEM or micro-CT analysis. In conclusion, pre-etching of apical dentin can provide a better seal for GMTA but not for WMTA.