Influência de diferentes soluções neutralizadoras do peróxido de hidrogênio na morfologia dentária radicular

Abstract

The consequences of the application of antioxidant agents on dental micromorphology are still poorly understood. Therefore, the present study aimed to evaluate, by means of scanning electron microscopy (SEM) the root tooth morphology after application of different neutralizing solutions in teeth previously submitted to internal bleaching with hydrogen peroxide. In which, 18 randomly selected bovine incisor had their crowns sectioned. The specimens were submitted to an endodontic and bleaching treatment with 35% hydrogen peroxide. They were divided into 6 groups: CO: unbleached control group; C: bleached; CAS: bleached + ascorbate solution of 10% solutions for 3 hours; CHC: bleached + calcium hydroxide mass for 7 days; CA: bleached + 10% alpha-tocopherol for 3 hours; CC: bleached + catalase- based gel for 2 minutes. The roots were longitudinally sectioned and analyzed in SEM at 2000x and 5000x magnifications. From the analysis, it was found that C presented dentinal tubules with greater diameter; CAS presented minor and partially obliterated tubules; CHC and CA had greater formation of precipitates, generating irregular surface and obliteration of the tubules; The CC presented the cleanest surface, with a tubular opening similar to the CO. The different neutralizers promoted the deposition of precipitates and obliteration of dentinal tubules, with catalase being the neutralizer that generated less interference in root morphology.