Open Access Online OnlyOral MedicineDOI: 10.3290/j.ohpd.b875523, PubMed ID (PMID): 33491373January 26, 2021,Pages 7-14, Language: EnglishVargas-Koudriavtsev, Tatiana / Fonseca-Jiménez, Pamela / Barrantes-Delgado, Patricia / Ruiz-Delgado, Berta / Conejo-Barboza, Geraldine / Herrera-Sancho, Óscar-AndreyPurpose: The aim of the present research was to analyse the effects of two bleaching agents, on the enamel crystallography by means of X-ray diffraction.
Material and Methods: Twelve human sound posterior teeth, were collected for the present study (n = 12) and from each tooth two enamel slabs were obtained and randomly assigned to one of two different bleaching protocols. The first protocol involved an in-office bleaching agent (hydrogen peroxide 37.5%/ SDI Polaoffice+), and the second an at-home whitening product (carbamide peroxide 16%/ PHILIPS Zoom! NiteWhite). X-ray diffraction readings were made before and after applying the treatments in order to analyse the peak intensity and crystal domain size. Additionally, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were carried out to identify the composition correctly. Statistical analysis included repeated measures analysis of variance (p ≤ 0.05).
Results: Peak intensity in spectra obtained by X-ray diffraction had a tendency to diminish, mostly in the at-home bleaching group. The analysed data approximate a decrease in the crystal domain size among the samples treated for longer periods of time. Statistical analysis depicted no statistically significant differences among the experimental groups (p ≥ 0.05).
Conclusions: Crystal domain size had a tendency to decrease, mostly when the enamel was treated by bleaching gels that had to be applied by prolonged periods of time.
Keywords: bleaching agent, enamel crystallography, X-ray diffraction
