Coronal Tooth Discoloration After the Use of White Mineral Trioxide Aggregate

Figures & data

Figure 1 Preoperative radiograph with periapical radiolucencies # 51 and 61.

Figure 2 Grayish discoloration #61.

Figure 3 Image taken 9 months later revealing significant remineralization in the periapical region.

Figure 4 Photograph after completion of bleaching procedures.

Table 1 Different Chemical Reactions of WMTA That Lead to Discoloration

Chemical Reactions
Interaction of Bi2O3 with collagen in dentin to form black precipitate crystals.^Citation14
Reduction of Bi2O3 to metallic bismuth under irradiation and anaerobic conditions.^Citation14
Oxidation of and Bi2O3 incorporation of remaining iron content within WMTA into calcium aluminoferrite phase of set WMTA.^Citation14
Reaction between Bi2O3 and sodium hypochlorite produces dark brown discoloration.^Citation15
Oxidation of Bi2O3 and oxygen becomes unstable and reacts with CO2 in air, and produces bismuth carbonate.^Citation14
Ca ions released from MTA react with phosphate ions in dentinal fluid and precipitation of carbonated apatite.^Citation16
Interaction between erythrocytes and the unset WMTA.^Citation15

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