Descoloração dentária induzida por materiais utilizados na terapia regenerativa endodôntica e a efetividade do clareamento intra-coronário

Abstract

This study evaluated the coronal discoloration induced by materials used in endodontic regenerative therapy, as well as the effect of internal bleaching on discoloration. Thirty third molars were randomly allocated according to discoloration etiology (n = 10): MTA – White Mineral Trioxide Aggregate, TAP - triple antibiotic paste and BLD - bovine blood (control). After tooth color measurement at baseline, the root canals were partially filled with MTA, TAP, or a cotton pellet with bovine blood was placed into the pulpal chamber. The color changes were assessed after 30, 60 and 180 days using a portable spectrophotometer (CieLab system). Following the discoloration, internal tooth bleaching was performed with a mixture of sodium perborate and hydrogen peroxide inserted into de pulpal chamber and replaced weekly for 21 days. The crown color was measured before each replacement of bleaching agent and one-week after the last one. At baseline, after staining and bleaching, data of each color parameter were individually analyzed by one-way ANOVA, while differences on ∆E were assessed by 2-way repeated measures ANOVA (α = 0.05). After the staining time, TAP resulted in darker and greener specimens, and no difference was observed between teeth stained with blood or MTA. Walking bleaching resulted in improved tooth color without difference on color change among the etiologic agents. However, specimens stained with TPA remained darker, greener and bluer after the end of bleaching procedures. In conclusion, TPA resulted in more significant tooth discoloration and the worst color remained after tooth bleaching procedures.