Biomineralization Ability and Interaction of Mineral Trioxide Aggregate and White Portland Cement With Dentin in a Phosphate-containing Fluid

被引:237
作者
Reyes-Carmona, Jessie F. [2 ,3 ]
Felippe, Mara S.
Felippe, Wilson T. [1 ]
机构
[1] Univ Fed Santa Catarina, Dept Endodont, Sch Dent, Florianopolis, SC, Brazil
[2] Univ Fed Santa Catarina, Postgrad Program, Florianopolis, SC, Brazil
[3] Univ Costa Rica, Dept Restorat Sci, San Jose, Costa Rica
关键词
Amorphous calcium phosphate; biomineralization; bioactivity; carbonated apatite; mineral trioxide aggregate (MTA); Portland cement; IN-VITRO; MTA; GRAY; APEXIFICATION; PULP;
D O I
10.1016/j.joen.2009.02.011
中图分类号
R78 [口腔科学];
学科分类号
1003 ;
摘要
Introduction: Mineral trioxide aggregate (MTA) has been shown to be bioactive because of its ability to produce biologically compatible carbonated apatite. This study analyzed the interaction of MTA and white Portland cement with dentin after immersion in phosphate-buffered saline (PBS). Methods: Dentin disks with standardized cavities were filled with ProRoot MTA, MTA Branco, MTA BIO, white Portland cement + 20% bismuth oxide (PC1), or PC1 + 10% of calcium chloride (PC2) and immersed in 15 mL of PBS for 2 months. The precipitates were weighed and analyzed by scanning electron microscopy (SEM) and x-ray diffraction. The calcium ion release and pH of the solutions were monitored at 5, 15, 25, and 35 days. The samples were processed for SEM observations. Data were analyzed by using analysis of variance or Kruskall-Wallis tests. Results: Our findings revealed the presence of amorphous calcium phosphate precipitates with different morphologies. The apatite formed by the cement-PBS system was deposited within collagen fibrils, promoting controlled mineral nucleation on dentin, observed as the formation of an interfacial layer with tag-like structures. Conclusions: All the cements tested were bioactive. The cements release some of their components in PBS, triggering the initial precipitation of amorphous calcium phosphates, which act as precursors during the formation of carbonated apatite. This spontaneous precipitation promotes a biomineralization process that leads to the formation of an interfacial layer with tag-like structures at the cement-dentin interface. (J Endod 2009;35:731-736)
引用
收藏
页码:731 / 736
页数:6
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